Search

The first edition of ACI CODE-440.11 was published in September 2022, where some code provisions were either based on limited research or only analytically developed. Therefore, some code provisions, notably shear and development length in footings, are difficult to implement. This study, through a design example, aims at a better understanding of the implications of code provisions in ACI CODE-440.11-22 and compares them with ones in CSA S806-12, thereby highlighting a need for reconsiderations. An example of the footing originally designed with steel reinforcement was taken from the ACI Reinforced Concrete Design Handbook and redesigned with GFRP reinforcement as per ACI CODE-440.11-22 and CSA S806-12. A footing designed as per ACI CODE-440.11-22 requires a thicker concrete cross section to satisfy shear requirements; however, when designed as per CSA S806-12, the required thickness becomes closer to that of the steel-reinforced concrete (RC) footing. The development length required for a glass fiber-reinforced polymer-reinforced concrete (GFRP-RC) cross section designed as per ACI CODE-440.11-22 was 13% and 92% greater than that designed as per CSA S806-12 and ACI 318-19, respectively. Also, the reinforcement area required to meet detailing requirements is 170% higher than that for steel-RC cross section. Based on the outcomes of this study, there appears to be a need for reconsideration of some code provisions in ACI CODE-440.11-22 to make GFRP reinforcement a viable option for RC members. [ABSTRACT FROM AUTHOR]

The response and the safety of geostructures constructed on hilly regions or sloping grounds are receiving increased attention. As the foundation of geostructures resting on slopes is often in the vadose zone, accounting for appropriate properties of partially saturated soil is essential for effective design. Moreover, changes in climatic conditions will adversely affect the load-carrying capacity and the stability of the footing resting on unsaturated slopes. Often, the soil–water retention curve (SWRC) at null stress is adopted but is expected to be affected by various factors, including the stress state of the sample. In the present study, an attempt has been made to demonstrate the effectiveness of using stress-dependent SWRC (SDSWRC) in analyzing a footing resting on a slope exposed to seasonal variations. The SDSWRC along the drying–wetting path determined experimentally was fitted using the standard SWRC model. The key parameters of the SDSWRC, hydraulic conductivity function, and shear strength of unsaturated soils are utilized in numerical modeling. Transient state flux analysis is carried out to mark the effects of SDSWRC in the development of hydraulic response. The stability of an unsaturated slope subjected to a footing load located at a chosen setback distance was assessed under various hydromechanical conditions. The results demonstrate that the seasonal variation, water table position, and net stress significantly influence the stability and the load-carrying capacity of the footing resting on an unsaturated slope. [ABSTRACT FROM AUTHOR]

A number of the quantity-sensitive stress systems which are characterised by complex weight distinctions have often proven challenging for parallel constraint-based metrical frameworks. A number of parallel-OT accounts are proposed to explain stress systems with multi-level weight hierarchies, in which syllables with long vowels (CVV) are more prominent than closed syllables (CVC), and closed syllables are more prominent than short open syllables (CV). The majority of these accounts are either inadequate or implausible. This paper seeks to provide an alternative account of stress systems with complex weight distinctions. Gradual prosodification, as an application of Harmonic Serialism, is the proposed framework for analysis. Maintaining gradualness and harmonic improvement in prosodic structure across the different steps of the derivation is deemed to be sufficient to achieve the required effects. The realisation of the various prominence relations illustrated in those multi-level weight hierarchies is considered to be an epiphenomenon of the sequential application of independently motivated prosodification processes, such as coda consonant moraification and foot construction. The proposed gradual prosodification model is applied to the stress systems of Kashmiri and Pulaar, that have identical algorithms for primary stress assignment, in addition to the secondary stress patten attested in Pulaar. [ABSTRACT FROM AUTHOR]

Legal genres are situation-sensitive and one same genre may take different structural and functional patterns according to the historical context within which it is situated. Judicial opinions of ancient China, for example, look like a totally different genre in contrast with the language of modern Chinese judicial documents. It is not uncommon that county magistrates' (ancient Chinese judges) writing considerably downplays the task of reasoning and argumentation and becomes fully devoted to the provision of emotional narratives regarding defendants' wrong-doings and to the meta-communication of imperial ideological values to grassroots. This paper looks into why ideology is a key concern of ancient Chinese judicial writing, what concrete ideological values are actually invoked and how they are interactively disseminated. The analytical framework combines the notion of contextualization (Gumperz, 1982), interactive framing (Tannen, 1993), and footing (Goffman, 1981). Through a nuanced interpretation of the relatedness of imperial ideological values and judicial language structures, the authors attempt to reveal how ancient judicial opinions are built as speech activities of performing identities and activities of presenting ideological stances and beliefs. [ABSTRACT FROM AUTHOR]

The ground movements related to the presence of old underground cavities are often damaging to structures and infrastructures. Considering these ground movements in calculations will prevent considerable human loss and material damage. Many areas, both in Algeria and in abroad, are prone to instability caused by ground rupture and the phenomenon of sinkhole progression. The objectives of this work are first to numerically simulate the process of cavity collapse and second to analyze the impact of cavity properties on structure stability. A finite element model was established to analyze the influence of several cavity parameters (dimensions, volume, and spacing). Validation of the model relied on comparing numerical results with experimental data from scientific research, as well as those from analytical approaches. Adequate correlation was achieved. The study allowed deriving mathematical equations relating to several parameters, including cavity dimensions and position in the soil, soil characteristics, and footing width. These results will be considered to reduce the risk of surface structure instability.

This paper presents the findings regarding the displacement-load behavior of both plane strain model experiments' ultimate load and numerical analyses conducted on unreinforced and reinforced sand slopes loaded with strip footing. The investigated parameters include the impact of the reinforcement and varying eccentricity on the ultimate load and displacement of the strip footing. A group of finite element analyses was performed with the 3D plane strain model and the computer code ANSYS software to validate the results of the model experiments on a slope. The results from both the numerical analyses and model experiments suggested that the use of reinforcement could enhance the load–displacement behavior of the central and eccentrically loaded footings. The load–displacement curves demonstrated that a higher load eccentricity leads to a reduction in the ultimate load of the strip footing. The concordance between the computed and observed results was reasonably satisfactory for the load displacement and the overall behavioral trend. [ABSTRACT FROM AUTHOR]

A detailed numerical analysis has been accomplished to explore the influence of geometrical parameters of geocell reinforcement on the load carrying behavior of footing using three-dimensional finite element techniques. The influencing parameters considered such as shape, height, pocket size, stiffness of geocell reinforcement, and friction angle of infill materials. Results indicate that the inclusion of the geocell reinforcement irrespective of the shape of geocells significantly enhances the strength and stiffness of the foundation system. However, the pressure-settlement behavior is noticeably influenced by the shape of the geocells. The load carrying capacity is found to be minimum for square shaped (i.e., 400 kPa) followed by circular, diamond, and honeycomb shapes (i.e., 1000 kPa) of geocells. With increase in height of geocell mattress, the performance of the foundation system increases noticeably. The findings indicate that the load bearing capacity increases significantly up to a height ratio (H/B) of 1.5, beyond which further increment found to be marginal. Additionally, the efficacy of the system improves with increase in stiffness of reinforcement and reduces with increase in geocell pocket size. Furthermore, it is evident that the higher frictional angle of the soil mobilizes enhanced resistance on the interface, improving the overall performance. [ABSTRACT FROM AUTHOR]

As in most other languages, clicks in Hebrew are not phonemes but still occur very frequently in speech. This Interactional Linguistic study, based on a corpus of casual Hebrew conversation, explores clicks at discourse unit junctures – prefacing topics, sequences, and their parts. We argue that the function of such clicks is best understood through Goffman's notion of 'frame shifts,' signalling changes in footing. Some frame-shifting clicks are byproducts of swallowing and breathing; at the same time, we show that click use is regular in certain contexts and interactionally significant, and that such clicks qualify as discourse markers. The tension between being non-linguistic epiphenomena and having a syntactic status is what makes frame-shifting clicks 'liminal signs.' Finally, we hypothesize that frame-shifting clicks are explainable as the result of a reanalysis in specific bridging contexts, whereby clicks-as-byproducts are conventionalized into discourse markers. This process may explain why non-phonemic clicks are so widespread across the world, and it may serve as a starting point for describing the development of additional interactional functions of clicks. • Clicks appear in Hebrew regularly at discourse unit junctures. • Such clicks signal 'frame shifts': changes in speakers' interactional footing. • Some clicks are byproducts of breathing and swallowing. • Mouth-clearing clicks enter language through reanalysis into discourse markers. [ABSTRACT FROM AUTHOR]

Abstract The current code provisions in ACI 440.11 are based on the flexural theory that applies to slender members and may not represent the actual structural behavior when the shear span-to-reinforcement depth ratio is less than 2.5 (i.e., deep members). The Strut-and-tie method (STM) can be a better approach to design deep members; however, this chapter is not included in the code. Research has shown that STM models used for steel-reinforced concrete (RC) give satisfactory results when applied to glass fiber-reinforced polymer-reinforced (GFRP)-RC members with a/d less than 2.5. Therefore, this study is carried out to provide insights into the use of STM for GFRP-RC deep members based on the available literature and to highlight the necessity for the inclusion of a new chapter addressing the use of STM in the ACI 440.11 Code. It includes a design example to show the implications of ACI 440.11 code provisions when applied to GFRP-RC deep members (i.e., isolated footings) and compares it when designed as per STM provided in ACI 318-19. It was observed that current code provisions in ACI 440.11 required more concrete thickness (i.e., h = 1.12 m) leading to implementation challenges. However, the required dimensions decreased (i.e., h = 0.91 m) when the design was carried out as per STM. Due to the novelty of GFRP reinforcement, current code provisions may limit its extensive use in RC buildings, particularly in footings given the water table issues and excavation costs. Therefore, it is necessary to adopt innovative methods such as STM to design GFRP-RC deep members if allowed by the code.

Previous research has argued that consecutive interpreters constitute laminated speakers in the sense that they engage with different kinds of footing at once, representing another's point of view through their words in another language. These multiple roles also play out in their gesturing, as they sometimes indicate deictically who is the source of the ideas and stances they are expressing (the principal). Simultaneous interpreters, though, often work in an interpreting booth; they are often not seen by the audience, yet many of them gesture, sometimes frequently. How are simultaneous interpreters using gesture in relation to stance-taking and footing? We consider the case of simultaneous interpreters rendering popular science lectures between (both to and from) Russian (their L1) and either English or German (their L2). Though only hearing the audio of the lectures, the interpreters produced many gestures, which were analyzed for their function. Some representational and deictic gestures appeared to clearly involve the interpreter as the principal (writing numbers with one's finger to help remember them or pointing to two places on the desk to keep track of two different quantities mentioned). Other representational and deictic gestures are ambiguous as to whether they are enacting what the interpreter may have imagined what the lecturer did or whether they arose out of the interpreter's own thinking for speaking (e.g., tracing the form of a bird being mentioned or pointing to an empty space when the lecturer was referring to a graph). Pragmatic gestures, showing one's stance toward the topic of the talk, were the most ambiguous as to the footing, reflecting how the interpreter may be engaged in fictive interaction with their imagined audience. Self-adapters, however, more clearly involve the interpreter as the principal, as such actions are known to support cognitive focussing and self-soothing. In sum, we see varying degrees of clarity as to whose stance and principal footing simultaneous interpreters are expressing bodily as laminated speakers. The variable ambiguity can be attributed to the nature of gesture as a semiotic system, the functions of which are more often dependent on co-occurring speech than vice versa. [ABSTRACT FROM AUTHOR]

The current code provisions in ACI 440.11 are based on the flexural theory that applies to slender members and may not represent the actual structural behavior when the shear span-to-reinforcement depth ratio is less than 2.5 (i.e., deep members). The Strut-and-tie method (STM) can be a better approach to design deep members; however, this chapter is not included in the code. Research has shown that STM models used for steel-reinforced concrete (RC) give satisfactory results when applied to glass fiber-reinforced polymer-reinforced (GFRP)-RC members with a/d less than 2.5. Therefore, this study is carried out to provide insights into the use of STM for GFRP-RC deep members based on the available literature and to highlight the necessity for the inclusion of a new chapter addressing the use of STM in the ACI 440.11 Code. It includes a design example to show the implications of ACI 440.11 code provisions when applied to GFRP-RC deep members (i.e., isolated footings) and compares it when designed as per STM provided in ACI 318-19. It was observed that current code provisions in ACI 440.11 required more concrete thickness (i.e., h = 1.12 m) leading to implementation challenges. However, the required dimensions decreased (i.e., h = 0.91 m) when the design was carried out as per STM. Due to the novelty of GFRP reinforcement, current code provisions may limit its extensive use in RC buildings, particularly in footings given the water table issues and excavation costs. Therefore, it is necessary to adopt innovative methods such as STM to design GFRP-RC deep members if allowed by the code. [ABSTRACT FROM AUTHOR]

In this study, the effects of groundwater level (GWL) fluctuation on settlements of footing and pile in sand were investigated based on results from the centrifuge tests. The effect of GWL fluctuation was significant yet different depending on the type of foundation. Settlements induced by GWL fluctuation were 7.06% (141.2 mm) and 9.13% (27.4 mm) of footing width and pile diameter, respectively, indicating that pile was less sensitive to GWL fluctuation. Settlements of both footing and pile were larger during rising GWL than during falling GWL. With an increase in load level, GWL-induced settlement additionally occurred for both footing and pile. From the particle image velocimetry method (PIV), it was shown that the effect of GWL fluctuation was more significant in a zone with higher load. The load transfer relationship of pile before and after GWL fluctuation revealed that the skin friction increased in the middle part of pile and decreased in the near-surface and lower near-pile tip zones. The FE analysis was performed, and the extended lower-bound (ELB) curves of footing and pile were proposed based on the settlement ratio to quantitatively characterize the effect of GWL fluctuation. [ABSTRACT FROM AUTHOR]

Cavities are common subsurface anomalies that have a significant impact on the bearing capacity of footings. While cavities behave three-dimensionally, in previous studies, the analysis of cavities has been limited to two-dimensional plane-strain analysis because of the time-consuming nature and complexity of three-dimensional modeling. However, this study demonstrates that the bearing capacity factor derived from three-dimensional modeling can be up to 10 times higher than that obtained from plane-strain analysis, highlighting the importance of considering three-dimensional effects. The present paper conducted three-dimensional simulations to investigate the impact of spherical cavity on the failure mechanisms and bearing capacity of footings under undrained conditions. An extensive parametric study was performed to investigate the influential parameters, including footing width to cavity dimension ratio (B/D), cover depth ratio (C/D), overburden factor (γD/Su), and void eccentricity ratio (S/D) for both circular or square footings. The results indicate that increasing the overburden factor and void eccentricity ratio leads to a decrease and increase in the bearing capacity of the footing, respectively. Furthermore, changes in other parameters can either increase or decrease the bearing capacity depending on the characteristics of the cavity (size and location) and footing (size and shape). General solutions for the bearing capacity factor are provided for different variations of the dimensionless parameters. This study also examined various failure mechanisms, including both cavity-independent and cavity-dependent failure mechanisms, associated with circular and square footings and influential parameters. These mechanisms are categorized into three zones for cavity-independent failures and four zones for cavity-dependent failures. The changes in the influential parameters including B/D, S/D, γD/Su, and C/D lead to changes in the type of failure mechanism and the size of the failure zones, while the foundation shape does not have a significant effect on the failure mechanism. Sinkholes and underground cavities annually contribute to infrastructure damage and financial losses. The 1981 incident in Winter Park, Florida, exemplifies the real-world consequences. Previous investigations have been limited to two-dimensional models due to the time-consuming nature and complexity of three-dimensional modeling, but the real-world nature of cavities in three dimensions requires a more comprehensive understanding. This study directly addresses this need by investigating the impact of three-dimensional cavities on the bearing capacity of circular and square building foundations, also known as footings. This study thoroughly investigated the factors influencing the results, encompassing cavity size, depth, soil weight, and off-center position. It extensively explored potential footing failures, providing detailed discussions. Our findings are presented as easy-to-understand maps and charts covering a broad range of potential scenarios. These visual tools can help engineers and researchers accurately estimate the stability of a building's foundation when a cavity is present underneath. In simpler terms, this research has created a handy tool for professionals to predict the potential danger posed by hidden cavities to buildings and infrastructure. This knowledge can then be applied to ensure safer building practices, potentially saving a significant amount of money and preventing accidents in the future. [ABSTRACT FROM AUTHOR]

The issue of subgrade soil often involves unstable soil properties, such as low bearing capacity, susceptibility to expansion and shrinkage, and vulnerability to erosion and deformation due to traffic loads and weather conditions. Unstable subgrade soil can cause various infrastructure problems, including cracks, settlement, and damage to road surfaces. Therefore, stabilizing subgrade soil is an important step to ensure the reliability and longevity of highways. One effective and sustainable method for subgrade soil stabilization is by utilizing local waste materials. The use of local waste materials such as fly ash (FA) and waste foundry sand (WFS) not only improves the physical and mechanical properties of the soil but also helps reduce environmental impact by repurposing pollutants. This study aims to analyze the effect of the thickness of subgrade layers stabilized with FA and WFS on bearing capacity. The initial stage includes examining the physical and mechanical properties of natural soil and soil stabilized with FA and WFS. The waste content used is 9 % FA and 15 % WFS by dry weight of the soil. Subgrade modeling was conducted using a steel box measuring 60×60×60 cm with a soil thickness of 30 cm. Load testing was carried out on 5 layer variants that had undergone 4 days of curing. The study results found that the ultimate bearing capacity (qult) of 890 kPa was produced by the V4 layer, which is a subgrade with a 30 cm thick layer of soil stabilized with FA and WFS at a settlement of 6 mm. The bearing capacity ratio of 2.87 means that the subgrade with a 30 cm thick layer of soil stabilized with FA and WFS experienced an improvement in bearing capacity of 2.87 times that of the subgrade with untreated soil material. The results obtained can be applied in practice to the local geotechnical conditions of the project site in West Java, including natural soil properties and seasonal changes. [ABSTRACT FROM AUTHOR]

This article presents a critical discussion of the repercussion of overshooting effects on element tests and finite-element simulations. For exemplification purposes, three advanced constitutive models for sands that had already achieved a certain level of accuracy in the simulation of monotonic and cyclic loading were carefully selected; namely, a bounding surface plasticity model, a hypoplastic model with intergranular strain, and a hypoplastic model with elastoplastic anisotropic intergranular strain. Cyclic loading laboratory data and scale tests on Karlsruhe fine sand were considered to support the analyses. The obtained results suggest that the overshooting issue is one of the most serious limitations of the selected models and has a major impact on elemental and finite-element simulations. Therefore, models' end-users should be aware of this drawback when performing simulations under certain conditions involving unloading–reloading episodes with different strain amplitudes. [ABSTRACT FROM AUTHOR]

Previous research has argued that consecutive interpreters constitute laminated speakers in the sense that they engage with different kinds of footing at once, representing another’s point of view through their words in another language. These multiple roles also play out in their gesturing, as they sometimes indicate deictically who is the source of the ideas and stances they are expressing (the principal). Simultaneous interpreters, though, often work in an interpreting booth; they are often not seen by the audience, yet many of them gesture, sometimes frequently. How are simultaneous interpreters using gesture in relation to stance-taking and footing? We consider the case of simultaneous interpreters rendering popular science lectures between (both to and from) Russian (their L1) and either English or German (their L2). Though only hearing the audio of the lectures, the interpreters produced many gestures, which were analyzed for their function. Some representational and deictic gestures appeared to clearly involve the interpreter as the principal (writing numbers with one’s finger to help remember them or pointing to two places on the desk to keep track of two different quantities mentioned). Other representational and deictic gestures are ambiguous as to whether they are enacting what the interpreter may have imagined what the lecturer did or whether they arose out of the interpreter’s own thinking for speaking (e.g., tracing the form of a bird being mentioned or pointing to an empty space when the lecturer was referring to a graph). Pragmatic gestures, showing one’s stance toward the topic of the talk, were the most ambiguous as to the footing, reflecting how the interpreter may be engaged in fictive interaction with their imagined audience. Self-adapters, however, more clearly involve the interpreter as the principal, as such actions are known to support cognitive focussing and self-soothing. In sum, we see varying degrees of clarity as to whose stance and principal footing simultaneous interpreters are expressing bodily as laminated speakers. The variable ambiguity can be attributed to the nature of gesture as a semiotic system, the functions of which are more often dependent on co-occurring speech than vice versa.

Sand typically exhibits anisotropic internal structure which may significantly influence its mechanical behavior. The material point method (MPM) can eliminate mesh distortion and thus is suitable for investigating geotechnical problems with large deformation. In this study, an advanced anisotropic critical state theory (ACST)-based soil model is implemented in MPM to study the response of strip footing resting on anisotropic sand. The capability of the model is verified by simulating several element tests and strip footing tests with different soil densities and fabric bedding plane orientations. For the footing problem with a vertical load, as the fabric bedding plane orientation increases, the bearing capacity decreases and its corresponding settlement increases. The failure pattern becomes asymmetrical when the bedding plane orientation or the loading direction is inclined. A comparison between the simulation results predicted by the anisotropic and isotropic models is made, which demonstrates that neglecting the fabric anisotropy may lead to the overestimation of the bearing capacity.

In this investigation, the bearing capacity solution of a strip footing in anisotropic clay under inclined and eccentric load is analyzed using the numerical simulation model. The lower and upper bound finite element limit analysis (FELA) approaches are utilized to establish precise modeling and derive the numerical outcomes of a strip footing's bearing capacity. All analyses use effective automated adaptive meshes with three iteration stages to enhance the accuracy of the outcomes. The parametric analysis is performed to examine the influence of four dimensionless parameters which are taken into account in this study, namely the anisotropic strength ratio, the dimensionless eccentricity, the load inclination angle, and the adhesion factor to the bearing capacity factor. Furthermore, a new model has been proposed to predict the bearing capacity factor for the calculation of the undrained bearing capacity for footings resting on an anisotropic clay using an advanced data-driven method (MOGA-EPR). The new model takes into account the anisotropy, eccentricity, and inclination of the applied load and could be used with confidence in routine designs of shallow foundations in undrained conditions with the consideration of the anisotropic strengths of clays.

Settlements are one of the most important performance indicators for designing footings over soft soils reinforced by rigid inclusions (RI). Although traditional numerical approaches can effectively calculate settlements, the necessary time calculation is important as this problem is a three dimensional one. In this investigation, 369 numerical simulations based on a finite difference (FD) approach were completed to build a database. The collected data include a variation of the footing loading (L), thickness of the load transfer platform (TH), load eccentricity (LE), Young's modulus (E), cohesion (C) and friction angle (F) of the load transfer platform granular material and the compression ratio (CR) of soft soils are input variables. and the settlements are considered as the output variables. Extreme learning machine (ELM), Elman neural network (ENN), generalized regression neural network (GRNN), support vector regression (SVR), Artificial neural network (ANN) and a hybrid model of Slime Mold algorithm- based artificial neural network (SMA-ANN) were used to predict the settlements of a single footing on soft soil reinforced by rigid inclusions. Six performance indicators including the root mean square error (RMSE), the determination coefficient (R2), the mean absolute error (MAE), the prediction accuracy (U1), the prediction quality (U2) and the variance accounted for (VAF) are proposed to compare the performance of all the proposed models. The results show that the SMA-ANN was the best model for predicting the settlement of a single footing on a soft soil reinforced by rigid inclusions. The most important input parameters are the friction angle, cohesion and young modulus of the load transfer platform. [ABSTRACT FROM AUTHOR]

In this investigation, the bearing capacity solution of a strip footing in anisotropic clay under inclined and eccentric load is analyzed using the numerical simulation model. The lower and upper bound finite element limit analysis (FELA) approaches are utilized to establish precise modeling and derive the numerical outcomes of a strip footing’s bearing capacity. All analyses use effective automated adaptive meshes with three iteration stages to enhance the accuracy of the outcomes. The parametric analysis is performed to examine the influence of four dimensionless parameters which are taken into account in this study, namely the anisotropic strength ratio, the dimensionless eccentricity, the load inclination angle, and the adhesion factor to the bearing capacity factor. Furthermore, a new model has been proposed to predict the bearing capacity factor for the calculation of the undrained bearing capacity for footings resting on an anisotropic clay using an advanced data-driven method (MOGA-EPR). The new model takes into account the anisotropy, eccentricity, and inclination of the applied load and could be used with confidence in routine designs of shallow foundations in undrained conditions with the consideration of the anisotropic strengths of clays. [ABSTRACT FROM AUTHOR]

This study contributes to the research on agency positioning in psychotherapy by looking at how clients and therapists, when discussing the client's difficulties, made use of two specific conversational practices, i.e., different grammatical forms of person reference and changes in footing, and what the consequences of this were for how the clients were positioned in relation to their problematic experiences. A data corpus of the first sessions of nine psychotherapies at a university training clinic in Finland was utilized. The uses of person references and changes in footing in therapists' initiative turns, clients' responses, and therapists' third position (recipient) actions were examined. The analysis showed that in initiative turns therapists usually used the second-person singular, as an invitation for the client to respond from his/her personal point of view, thus ascribing active agency to the client. When telling their problematic experiences, clients typically used so-called zero-person constructions, presenting such experiences as common to people in general, thus lessening their agency and inviting the therapist to share their experiential position. In recipient actions, therapists could use a combination of zero and active person reference which served to communicate an empathie stance and an invitation to the client to take an agentic observer position. Almost exclusively, only therapists used changes in footing. This could happen rapidly within single utterances and serve to express affiliation with the client's emotional experience and to invite or challenge the client to take an observer position. The study supplemented the CA change model with the DA and DSA notions of changes in agency positions as core elements in therapy talk and showed how variations in person references and changes in footing had a decisive influence on how different types of turns functioned within the overall conversational structure of the psychotherapy institution. [ABSTRACT FROM AUTHOR]

This study contributes to the research on agency positioning in psychotherapy by looking at how clients and therapists, when discussing the client's difficulties, made use of two specific conversational practices, i.e., different grammatical forms of person reference and changes in footing, and what the consequences of this were for how the clients were positioned in relation to their problematic experiences. A data corpus of the first sessions of nine psychotherapies at a university training clinic in Finland was utilized. The uses of person references and changes in footing in therapists' initiative turns, clients' responses, and therapists' third position (recipient) actions were examined. The analysis showed that in initiative turns therapists usually used the second-person singular, as an invitation for the client to respond from his/her personal point of view, thus ascribing active agency to the client. When telling their problematic experiences, clients typically used so-called zero-person constructions, presenting such experiences as common to people in general, thus lessening their agency and inviting the therapist to share their experiential position. In recipient actions, therapists could use a combination of zero and active person reference which served to communicate an empathic stance and an invitation to the client to take an agentic observer position. Almost exclusively, only therapists used changes in footing. This could happen rapidly within single utterances and serve to express affiliation with the client's emotional experience and to invite or challenge the client to take an observer position. The study supplemented the CA change model with the DA and DSA notions of changes in agency positions as core elements in therapy talk and showed how variations in person references and changes in footing had a decisive influence on how different types of turns functioned within the overall conversational structure of the psychotherapy institution.

This essay provides an overview of the study of framing in discourse as conducated in the field of interactional sociolinguistics. We review key theorizing on frames and related concepts such as footing, positioning, and speech activity that provides the foundation for this research. We note two basic understandings of frame in our field: interactive frames relate to situational definitions of what is going on in an interaction; knowledge schemas account for participants' expectations regarding people, objects, and so on. We give examples of how interactional sociolinguists have applied framing to illuminate moment-by-moment constructions of meanings, identities, and relationships across a range of contexts, as well as the role of knowledge and memory in these processes. With examples from studies of cross-cultural communication, everyday conversations among family and friends, and interaction in medical and digital discourse contexts, we emphasize how frames are transformed and laminated (or layered). While social movements have not been a central focus of interactional sociolinguistics research, we note that concern for social justice has been of foundational concern from the inception of this field, and note a number of studies that have demonstrated how micro-level moments of social activism and change are discursively constructed. These studies attest to the relevance of interactional sociolinguistic analysis of framing to researchers interested in social movements. [ABSTRACT FROM AUTHOR]

A numerical procedure is developed in this paper using the limit equilibrium method (LEM) to assess the load-settlement behavior of the geocell-reinforced shallow footings resting on 2D and 3D homogeneous foundation beds. The proposed bearing capacity of the geocell-reinforced footings is a combination of both the unreinforced bearing capacity and an additional load-bearing of the geocell mattress caused by the confinement and the load dispersion. Instead of total mobilization of the resisting mechanisms, which is the underlying assumption of the available LEMs, a partially mobilized resisting mechanism is assumed to be a function of the footing settlement and geocell aspect ratios, and the unknowns of the hypothesized formulations are obtained through an optimization procedure so that the results of the theoretical expression are compatible with those of the experimental model tests. The proposed analytical formulation adequately captures the load–displacement behavior and is considered a helpful tool to predict the behavior of the geocell-reinforced footings reinforced foundations. [ABSTRACT FROM AUTHOR]

The bearing capacity of closely spaced footings has become one of the important topics in geotechnical engineering research owing to the rapid development in urban areas around the world. In this paper, we propose three efficiency factors that can be used to describe the bearing capacity effects of closely spaced footings using Terzaghi's traditional bearing capacity equation. With an advanced finite-element limit analysis of upper and lower bounds, both the closely spaced strip footings and the multiple closely spaced strip footings on cohesive–frictional soil with a surcharge effect were investigated. The numerical results showed that the efficiency factors were significantly influenced by the internal frictional angle and the spacing ratio. Several comparisons were made with those published in the literature. Furthermore, the failure mechanisms of closely spaced footings are presented, while design charts were produced with a wide range of practical parameters. This study should be of great interest to foundation engineering practitioners. [ABSTRACT FROM AUTHOR]

Bearing capacity plays a significant role in evaluating the safety of the foundations rest on the slope. Many solutions have been proposed to assess the ultimate bearing capacity of foundation adjacent to the slope, however, the available analytical and empirical methods are associated with some shortcomings in view of slope material properties and geometry. Also, numerical methods suffer from the rigorous computational effort, and the accuracy of the outcome depends on the mesh and boundary effect. Therefore, a new analysis is employed in this research work that is able to consider all the effective parameters on the evaluation of ultimate bearing capacity. The results are compared with the existing numerical one in the literature and show good agreements. Also, in order to facilitate the use of the proposed method a Mathematica package code has been proposed to help the researcher to evaluate the bearing capacity of a shallow foundation rests on the slope.

This study adopts a practical approach to establish the estimation and adjustment methods of the interface stiffness for the machine-tool through the finite element analysis (FEA). First, numerical and experimental modal analysis (FMA and EMA) for each single subsystem of the machine-tool structure are performed. Then, the parameters obtained from EMA are used as the objective criterion function, and the FMA is conducted iteratively to solve the material Young's modulus and Poisson's ratio for each single subsystem structure, in which the geometrical model is simplified and FE mesh convergence is performed to ensure the quality and efficiency of the numerical analysis. Next, by considering that the machine-tool is assembled by subsystem stacking and that loading on each contact surface is deduced, the FE method is used to calculate the deformation of each contact interface after the single subsystem is stacked successively. The initial value of the interface stiffness estimated by the deformation formula in the mechanics of material is utilized as the initial condition for the iterative calculation in FMA. The changes of the modal parameters are observed in the analysis and the interface, which have a significant impact on the natural frequency variations of the whole machine-tool is selected as the main adjustment object. Then, the adjustment method proposed in this study is applied repeatedly to modify this interface stiffness. The results show that footing interface stiffnesses play the most important role that intensively affects the numerical analysis results of modal parameter. After the repeated adjustments of the interface stiffnesses of the footing, the error of the natural frequency of the whole machine-tool is less than 5%, which is calculated from the comparison between EMA and FMA results. It indicates that the proposed adjustment method in this study for footing interface stiffness determination has a valuable reference in practical use. [ABSTRACT FROM AUTHOR]

In this study, the effect of fluctuating groundwater level (GWL) on the settlement of footing foundation placed on sand was investigated based on the results obtained from centrifuge tests. In the tests, rising and falling phases of GWL were both considered, and the values of footing settlement (sft) obtained from each phase were compared. The centrifuge testing program was designed with a specifically manufactured test box and hydraulic control system. Image-based particle-displacement analysis using particle image velocimetry (PIV) was performed to capture inner soil particle movement during GWL fluctuation. Ground subsidence occurred most significantly during the first GWL fluctuation. Fluctuating GWL caused considerable sft while load was unchanged. sft was larger for rising GWL than for the falling phase and decreased as the number of GWL fluctuation increased. PIV analysis indicated that GWL-induced settlement was not uniform but larger within higher-loaded zone below footing, even if GWL changed uniformly and load on footing was unchanged. The collapse potential was introduced to describe and explain GWL-induced footing settlement, which was consistent with the results observed from the centrifuge tests. [ABSTRACT FROM AUTHOR]

In the absence of high-quality soils, the rigid inclusion reinforcement technique has been extensively used in geotechnical engineering practice to meet the serviceability requirements of construction projects. This article aims to investigate the behavior of a single footing placed on soft soil reinforced by four rigid inclusions using three-dimensional (3D) finite difference modeling (FDM). A set of full-scale experimental tests are used as references for the development of the numerical approach. The concurrence of the numerical and experimental data allows us to assess the load transfer platform thickness influence on the system under centered and eccentric loading conditions. Some preliminary insights can thus be obtained based on this analysis for the soft soil improvement using rigid inclusions at the design stage. [ABSTRACT FROM AUTHOR]

The bearing capacity of a strip footing located on geocell-reinforced sand under different eccentric loads has been evaluated by performing a series of physical modeling tests. The effects of changes in the placement depth, width, and height of the geocell as well as the loading eccentricity (e) have been investigated on the bearing capacity and tilt of the footing. The results revealed that using geocell increases the bearing capacity and reduces the footing tilt. These increasing and decreasing effects intensify by increasing the magnitude of the load eccentricity. The optimum depth of the reinforced layer for loading with various eccentricities was identical and equal to 0.1 of the footing width (B). However, the effective reinforcement depth for different eccentricity values of e/B = 0, 1/12, 1/6, and 1/3 were 1, 0.75, 0.5, and 0.25 times of the footing's width, respectively. The effect of geocell on increasing the bearing capacity and decreasing the footing tilt enhances with an increase in the height and width of the geocell. The optimal length of the reinforcing layer for eccentric loading e/B ≤ 1/6 was 4B and for e/B = 1/3 was equal to 2B. The use of geocell with greater height compared to geocell with greater width with regards to 11% lower amount of polymeric materials led to more increases in the bearing capacity under various eccentric loads by about 4 to 7%. Furthermore, to achieve a certain magnitude of the bearing capacity, using geocell with greater height is more cost-effective and also has less harmful effects on the environment due to containing less polymeric materials. [ABSTRACT FROM AUTHOR]

The study aimed to develop and fabricate a footing mat bar setter with technical features faster placement of reinforcements, adaptable to design of one and two-story building and easy installation. Moreover, the device will be subjected to functionality testing on assembly time, installation time and accuracy of placement. The research method employed was developmental and descriptive research utilizing the fifteen (15) construction experts along design, built and construction, Negros Occidental. A researcher-made questionnaire was formulated to evaluate the acceptability of the footing mat bar setter. The research instrument underwent validity and reliability testing. The statistical method used were the standard deviation, mean and Cronbach-alpha. The results of the study revealed that the device was able to meet the identified technical features. Furthermore, test trials showed that assembly time of the device will take eleven (11) minutes, the placement time of rebars for 1200x1200 mm is 7.08 minutes, 1000x1000mm is 3.45 minutes and 800x800mm is 2.22 minutes. The level of acceptability of the device in the aspects of design, functionality and features is very highly acceptability. It is recommended that the footing mat bar setter can be used as an alternative construction device in accomplishing mat bar assembly in shorter period of time. [ABSTRACT FROM AUTHOR]

The earthquake related destructions in buildings is alleviated by uncomplicated methods with the implementation of sandtire mix as the base isolation material below the footing. Rubber which is the major raw material for the elastomeric bearings shall be replaced with sand-rubber mix. The mix is placed below the footing to determine the deflections of the footing for trials such as 0%, 10%, 20%, 30 % and 50% crumb rubber (CR). Furthermore, the behaviour of the footing is studied with these trials under static and cyclic loading. The research is exclusively dealt to determine the energy dissipation capacity and stiffness degradation of the footing with and without base isolation material (sand-rubber mix). From the investigation it was evident that 30% crumb rubber combination have better seismic energy mitigating capacity. [ABSTRACT FROM AUTHOR]

This paper develops a theory of footing in Harmonic Serialism (HS; Prince & Smolensky 1993/2004; McCarthy 2000, 2016) where Con contains only directionally evaluated constraints (Eisner 2000, 2002; Lamont 2019, 2022 a , 2022 b ). Directional constraints harmonically order candidates by the location of violations rather than the total number of violations. A central result of adopting directional evaluation is that the constraint Parse($\sigma$) not only motivates iterative footing but also determines where feet surface. This obviates the need for alignment constraints (McCarthy & Prince 1993; McCarthy 2003; Hyde 2012 a , 2016), which determine where feet are parsed in HS with constraints that count loci (Pruitt 2010, 2012). The theory uses fewer constraints, is empirically adequate, and makes more restrictive predictions than HS with counting constraints and parallel Optimality Theory (Prince & Smolensky 1993/2004) with directional constraints. [ABSTRACT FROM AUTHOR]

Bearing capacity plays a significant role in evaluating the safety of the foundations rest on the slope. Many solutions have been proposed to assess the ultimate bearing capacity of the foundation adjacent to the slope, however, the available analytical and empirical methods are associated with some shortcomings in view of slope material properties and geometry. Also, numerical methods suffer from rigorous computational effort, and the accuracy of the outcome depends on the mesh and boundary effect. Therefore, a new analysis is employed in this research work that is able to consider all the effective parameters on the evaluation of ultimate bearing capacity. The results are compared with the existing numerical one in the literature and show good agreements. Also, in order to facilitate the use of the proposed method a Mathematica package code has been proposed to help the researcher to evaluate the bearing capacity of a shallow foundation that rests on the slope. [ABSTRACT FROM AUTHOR]

Connections between precast components in accelerated bridge construction (ABC) play an important role in the overall seismic performance of reinforced concrete bridges. This paper describes a new ABC column-footing connection for bridges located in high seismic regions. Half-scale models were designed and built based on an ABC bridge constructed in Utah. The column-footing connection incorporated grouted splice sleeves where the bars were grouted at both ends (GGSS). The GGSS used in the two cyclic tests were placed inside the footing and were recessed a distance of eight bar diameters below the column-footing interface. The difference between the two tests was the location of bar debonding near the column-footing interface. The experimental results showed that the performance of the two specimens was satisfactory and that the connections performed similarly to monolithic cast-in-place (CIP) ones. The performance of the precast connections was compared with previous research on similar CIP and precast specimens with GGSS placed in the footing directly at the column-footing interface. Improved seismic response was observed when the GGSS were recessed inside the footing with a debonded reinforcing bar zone inside the footing. [ABSTRACT FROM AUTHOR]