12 results on '"Kukreti, Anant R."'
Search Results
2. Student Understanding of the Engineering Design Process Using Challenge Based Learning.
- Author
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Gaskins, Whitney, Kukreti, Anant R., Maltbie, Catherine, and Steimle, Julie
- Subjects
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ENGINEERING , *LEARNING , *ENGINEERING design , *STUDENTS , *TEACHERS - Abstract
this study conducted in a large metropolitan city, teachers introduced and implemented CBL in the curriculum. One research objective of the study was to teach middle and high school students the engineering design process (EDP) while solving a real world challenge using Challenge Based Learning (CBL). The EDP is the formulation of a plan to help an engineer build a product or formulate a process with a specified performance goal. Because there are performance characteristics as well as constraints, there will typically be a variety of potential solutions. EDP involves a number of steps, and parts of the process may need to be repeated many times before production of a final product can begin. Students were asked to draw their understanding of the EDP at the conclusion of the CBL curricular Unit. Specifically, we observed the nature of students' misconceptions and the effects CBL pedagogy has on conceptual understanding of the EDP. For assessment the important elements of EDP are: 1. Correct terms are used 2. Terms are connected to each other 3. Terms are connected to each other in the correct order 4. Cyclical Representation of EDP is identified At the end of a CBL-EDP curricular Unit taught by a teacher, students were asked to complete a questionnaire which included a question asking them to illustrate their understanding of the way they implemented EDP in the Unit through a drawing. These drawings were interpreted for the elements listed above. To date, a four person team of trained scorers used a rubric to score EDP drawings from 6 out of 34 teachers (17.6%); this included 518 EDP drawings out of 4545 received (11.4%). Individual teachers had differing numbers of students in their classes. The four scorers had three training sessions and two scorers rated each drawing. In this paper, the training of the raters, the evaluation process used by them to score the EDP drawings made by the students, the results of their findings, and statistical technique used to validate the results are presented and discussed. As discussed later in the paper, our inter-rater reliability was 0.90 - 1.94 using Cronbach Alpha statistic for each pair of raters. Initial rubric scores indicate that the students can identify the steps in the EDP process and understand that they are connected. However, it is found that they are not representing the cyclical nature of EDP and the correct order of the steps. Since these results are a reflection of the teachers' Unit implementation, we will work with the project team and resource team to support professional development for the teachers to improve their CBL and EDP instruction. [ABSTRACT FROM AUTHOR]
- Published
- 2015
3. Peer Instructor or College Faculty - Who is Better for Leading Teacher Professional Development? (Evaluation).
- Author
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Rutz, Eugene, Kukreti, Anant R., Steimle, Julie, and Maltbie, Catherine
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COLLEGE teachers , *PROFESSIONAL education , *ENGINEERING design , *MODULAR design , *CAREER education - Abstract
The article focuses on who is better a peer instructor or college faculty for leading teacher professional development. Participating teachers are introduced to the engineering design process, the scope of engineering disciplines, and basic principles of engineering science. The participants then work in teams using the design process to solve open-ended problems.
- Published
- 2015
4. Factors That Support Teacher Shift to Engineering Design.
- Author
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Kukreti, Anant R., Maltbie, Catherine, and Steimle, Julie
- Subjects
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ENGINEERING design , *TEACHERS , *EDUCATION , *INDUSTRIAL design , *TECHNICAL specifications - Abstract
This paper presents a professional development (PD) program conducted at the University of Cincinnati for middle school and high science and math teachers. Teachers commit to the National Science Foundation (DUE-1102990) funded Cincinnati Engineering Enhanced Science and Math Program (CEEMS) for two years and learn to transform their classrooms into places where students collaboratively tackle real world, open-ended challenges by using the engineering design process. This paper focuses on three important elements of the PD that prepares teachers to incorporate engineering design process into the teaching of core science and math content. First, teachers experience engineering challenges themselves. By engaging in teamwork and collaboration, learning from failure, and experiencing the iterative nature of the engineering design process for themselves, teachers better identify with students. Second, the PD program is structured such that teachers are accountable to create and implement engineering design activities in their classrooms. Finally, teachers are supported and guided as they create and implement engineering design modules. This is accomplished using resource coaches, engineers and master teachers, who guide the teachers through the process of creating and implementing lessons incorporating engineering design activities and provide invaluable feedback as teachers reflect on their own practice. Program evaluation focuses on teacher changes in instructional practices, student growth in content knowledge, and student engagement. Related evaluation results and teacher feedback are documented. As indicated by teacher self-report current instructional practices, teachers' shift in practices to a student-centered, engineering designbased approach seems to support students' growth in content knowledge as measured by pre-post assessment results. Beyond effective content delivery, student engagement in engineering design challenges is high, as indicated by teacher qualitative data. [ABSTRACT FROM AUTHOR]
- Published
- 2015
5. Enhancing Retention and Academic Success of Undergraduate Engineering Students.
- Author
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Kukreti, Anant R. and Aure, Temesgen Wondimu
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STEM education , *ENGINEERING education , *ENGINEERING students - Abstract
The article focuses on the impact of three important strategies that have been implemented for improving student retention for engineering undergraduates as part of a National Science Foundation (NSF) project funded by the Science, Technology, Engineering, and Mathematics Talent Expansion Program at the University of Cincinnati. The project targets recruitment and retention of engineering minorities, women, economically disadvantaged and First Generation college-bound students.
- Published
- 2015
6. Enhancement of a tuned mass damper for building structures using fuzzy logic.
- Author
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Edalath, Sanooj, Kukreti, Anant R, and Cohen, Kelly
- Subjects
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TUNED mass dampers , *FREE vibration , *FORCED vibration (Mechanics) , *FUZZY logic , *COMPUTER simulation - Abstract
Over the past 10 years there has been a growing need to introduce closed-loop control technology for vibration suppression of buildings subject to wind or earthquake disturbances. This paper deals with the investigation of the effectiveness of a fuzzy logic based time variable damping tuned mass damper (TMD) on a building structure undergoing free and forced vibrations. The uniqueness of this approach is the application of a robust, nonlinear fuzzy based controller to emulate a time-optimal control strategy. Fuzzy logic based time variable damping is introduced into a semi-active TMD in order to enhance its performance in the vibration suppression of buildings. First, a single story structure for three different vibration suppression approaches is studied. The fuzzy logic based time variable damping TMD (fuzzy TMD) is compared to the baseline passive TMD as well as a conventional proportional-derivative (PD) controller. Forced vibration is introduced using a resonant harmonic sinusoidal excitation (i.e. same frequency as the fundamental frequency of the structure). Finally, the fuzzy TMD is compared to the baseline for the free vibration of a 15 story structure. For both structures studied, MATLAB® based simulation results show that the passive TMD and the PD, both constant gain approaches, provide similar results whereas the fuzzy TMD yields half the settling time. This effort clearly demonstrates the potential of a variable gain (damping) strategy for the vibration suppression of buildings. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
7. Modified stiffness model for thick flange in built-up T-stub connections
- Author
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Hantouche, Elie G., Kukreti, Anant R., Rassati, Gian A., and Swanson, James A.
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CORNER fillets , *FINITE element method , *STIFFNESS (Engineering) , *DEFORMATION of surfaces , *WELDED joints , *FLANGES - Abstract
Abstract: The results of the finite element simulations are used to develop a modified stiffness model to predict the behavior of thick-flange in built-up T-stub connections with Complete Joint Penetration (CJP) and fillet welds. Using ABAQUS, three-dimensional finite element (FE) models are developed for the selected cases. The performance of the FE model results is compared to experimental results for validation. The FE model results are used to develop the modified stiffness model that characterizes the behavior of thick-flange in built-up T-stub connections. The model is based on a combination of finite element and a stiffness modeling approach that incorporates the overall flange deformations of key component elements, and it includes nonlinear material behavior of both tension bolts and base material, accounts for pretension of fasteners, and contact interactions. The modified stiffness model consists of linear and nonlinear springs which model deformations from tension bolt elongation, T-stub flange, and prying force. The model predicts the force-deformation curve of the whole T-stub flange taking into account flange-partial-yielding and accounting for the contact force encountered. A new failure limit state is highlighted, which is partial-yielding at the K-zone followed by bolt fracture, with or without prying. The behavioral characteristics of the flange in T-stub connections are examined including strength, stiffness, and deformation capacity. Comparisons of model predictions with FE and experimental data show that the modified stiffness model accurately predicts the response of thick-flange built-up T-stub connections with CJP or fillet welds and accounts for flange-partial-yielding followed by tension-bolt-fracture, with and without prying. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF
8. Investigation of secondary prying in thick built-up T-stub connections using nonlinear finite element modeling
- Author
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Hantouche, Elie G., Kukreti, Anant R., and Rassati, Gian A.
- Subjects
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FINITE element method , *NONLINEAR statistical models , *FLANGES , *STRENGTH of materials , *STRUCTURAL frames , *STRUCTURAL plates , *MECHANICAL loads , *BENDING stresses - Abstract
Abstract: This study investigates the prying behavior in thick-flange built-up T-stub/column systems that should be addressed in designing full-strength double tee connections for use in moment resisting frames which satisfy prequalification requirements. In particular, this study focuses on the phenomenon herein indicated as secondary prying, which is related to the additional forces that are introduced into the tension bolts due to significant bending of the column flange. Three-dimensional finite element models that incorporate pretension of fasteners, full contact interactions, and nonlinear material characteristics are used to investigate secondary prying effect in thick-flange T-stub/column system with and without continuity plates. This study provides insight as to whether continuity plates are necessary in columns when designing and detailing full-scale T-stub connections for prequalification. The effect of secondary prying is incorporated into an existing prying strength model for thick T-stubs to quantify the amount of total prying encountered in thick built-up T-stub connections with and without continuity plates. Parameters that impact the secondary prying in thick flange T-stub/column systems were identified based on the geometric configuration that results from the design of full-strength double tee connections with deep girders. The results show that decreasing the effect of secondary prying is achieved through either increasing the column size, or adding continuity plates to the column. This study provides information for detailing columns without continuity plates as well as quantifying the amount of prying so engineers can design for the additional load by increasing the bolt diameter. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF
9. Eight-bolt endplate connection and its influence on frame behavior
- Author
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Kukreti, Anant R. and Zhou, Feng-Feng
- Subjects
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FINITE element method , *ROTATIONAL motion , *NUMERICAL analysis , *CAD/CAM systems - Abstract
Abstract: The objective of this paper is to quantify the impact of semi-rigid connection properties on steel frame behavior. A finite element model and computer program is developed to investigate the moment–rotation behavior of eight-bolt stiffened endplate connections. The model includes both the beam side and the column side of a connection. A mesh generator is developed to generate a three-dimensional mesh with desired fineness. The numerical results are verified by comparison with experimental results. Parametric studies are conducted to develop prediction equations for the parameters in a power model representing the connection behavior. Frame analyses are conducted incorporating this connection model. A formula to classify fully and partially restrained endplate connections is proposed based on frame analysis results. [Copyright &y& Elsevier]
- Published
- 2006
- Full Text
- View/download PDF
10. Moment-Rotation Hysteresis Behavior of Top and Seat Angle Steel Frame Connections.
- Author
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Kukreti, Anant R. and Abolmaali, Ali S.
- Subjects
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STEEL framing , *HYSTERESIS - Abstract
Features an approach toward formulating analytical models to predict the moment-rotation hysteresis behavior of top and seat angle steel frame connections. Experimental program; Test results; Analytical models in moment-rotation hysteresis; Conclusions.
- Published
- 1999
- Full Text
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11. Prying Models for Strength in Thick-Flange Built-Up T-Stubs with Complete Joint Penetration and Fillet Welds.
- Author
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Hantouche, Elie G., Kukreti, Anant R., Rassati, Gian A., and Swanson, James A.
- Subjects
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JOINTS (Engineering) , *FINITE element method , *FABRICATION (Manufacturing) , *SHEAR strength , *TENSION control (Engineering) , *STRUCTURAL engineering - Abstract
The results of a series of finite-element (FE) simulations and experimental studies are used to develop two prying models that predict the failure strength of thick-flange built-up T-stub connections with complete joint penetration (CJP) and fillet welds. A parametric study based on identifying the major geometric and force-related parameters that vary within current acceptable steel fabrication and design practices is used to select the cases for analysis. The strength prying models predict the capacity of thick-flange built-up T-stub connections with CJP and fillet welds for the failure limit state of the partial yielding tension flange followed by bolt fracture. The accuracy of the developed strength models are verified with FE results of built-up T-stubs designed for full strength compared with existing models reported in the literature. Based on the results of this study, a refined design procedure that takes into account the partial yielding in thick-flange T-stubs is proposed. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
12. Built-up T-stub connections for moment resisting frames: Experimental and finite element investigation for prequalification
- Author
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Hantouche, Elie G., Rassati, Gian A., Kukreti, Anant R., and Swanson, James A.
- Subjects
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STRUCTURAL frames , *FINITE element method , *ROLLING (Metalwork) , *EARTHQUAKE zones , *WELDING , *PENETRATION mechanics , *SIMULATION methods & models - Abstract
Abstract: As a result of the SAC project, rolled T-stub connections have been demonstrated to be a viable alternative to welded connections for steel frames in seismic areas. One difficulty with these connections is that oftentimes the rolled profiles needed to fabricate the T-stub needed for deep beams are not immediately available to fabricators and so built-up sections are the only alternative. The goal of this investigation is to demonstrate through experimental and finite element studies that built-up T-stub connections can be successfully detailed for use in special and intermediate moment frames in seismic areas. The results of a series of component tests on built-up T-stubs, obtained by means of complete joint penetration welding (CJP) and fillet welding are presented and discussed, providing supporting evidence for the best fabrication choice. Component tests investigating hole fabrication practices are also presented, studying their effect on ductility under monotonic and cyclic loads. Furthermore, finite element models of thick flange T-stub connections is presented and finite element simulation results are compared to experimental results to demonstrate the applicability of built-up T-stub connections for use in special and intermediate moment frames. The finite element results show an acceptable agreement with the experimental results and describe the behavior. A partial yielding of the T-stub flange followed by bolt fracture is highlighted as a failure mode based on the finite element and the experimental results. It is anticipated that the data collected from a forthcoming series of full-scale tests will lead to the prequalification of this connection typology. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF
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