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The capacity of the circumferential joint of the precast concrete segmental tunnel lining (PCTL) structure in terms of shear performance principally includes the dowel action by connector/bolt as well as friction force, and it is a vital parameter to assess the mechanical response of the circumferential joint. Further, as there was no analytical model available for precise estimation of a circumferential joint in terms of the shear‐bearing capacity considering the dowel action of the bolt in the presence of axial/normal force, therefore in this investigation, an analytical model has been proposed to estimate the shear‐bearing capacity of the circumferential joint. Furthermore, the analytical model's precision and accuracy were validated via large‐scale experimental investigation on a circumferential joint of PCTL. Upon comparing analytical model outcomes with experimental results, absolute error varied between +5% and −9%, with an average value of the coefficient of friction at the yield point of the bolt. Moreover, the formation of hinges on the side of the bolt within the segment was considered a failure of the circumferential joint. Additionally, the parametric investigation revealed that with just a 1% change in axial force, the diameter, pre‐tightening, and yield strength of the bolt and concrete strength improved by 2.85%, 1%, 0.27%, 0.26% and 0.17% shear‐bearing capacity of the circumferential joint respectively. Axial force variation greatly influences the shear‐bearing capacity of circumferential joint followed by diameter, pre‐tightening, yield strength of the bolt, and concrete strength. Conclusively, with analysis of axial force distribution around the ring for the tunnel, the proposed model has been applied to a full ring to estimate shear bearing capacity. [ABSTRACT FROM AUTHOR]

The glubam (glue-laminated bamboo)-geopolymer concrete composite (BGCC) structure is a possible way to achieve sustainable construction due to its combination of renewable resources and industrial waste. This study combined glubam and geopolymer concrete in composite structures and investigated the shear behavior of BGCC structures with notched connections. Four groups of push-out tests were designed to evaluate the influence of the number of notches and screws on the slip modulus and shear capacity. The results showed that the composite structures with notched connections failed first due to shear cracking at the interface notch. The double-notch specimens increased the shear capacity by 54% compared to single-notch specimens. The shearing bearing capacity rose by 35% on average as a screw increased in a single notch. The ductility and slip modulus were influenced primarily by the screws, with each extra screw in a single notch increasing the slip modulus by 21% in each stage. Based on the test results, a modified formula was proposed to predict the shear-bearing capacity of notched connections in BGCC structures. This study provides comparison data for further studies in the long-term behavior of BGCC structures. [ABSTRACT FROM AUTHOR]

In order to study the shear mechanical properties of photovoltaic bracket member connection with the high⁃strength cold⁃formed thin⁃walled steel, 24 photovoltaic bracket connection specimens were tested for shear capacity. The mechanical properties of web and flange connected by bolts were mainly studied. The failure process and failure mode of the specimens were observed, and the load⁃displacement curve and ultimate bearing capacity of the specimens were obtained. The results show that when the peak load is reached, the self⁃drilling screw on the flange of the specimen is cut first, and then the cold⁃formed thin⁃walled steel plate near the bolt is compressed to yield, which leads to the typical bearing failure of the specimen. Compared with the specimen of the bolt on the flange, the stiffness of the specimen of the bolt on the web is larger, but the ductility is lower.Based on the relevant calculation formulas in the technical code, a modified calculation formula for calculating the bearing capacity of photovoltaic bracket member connection with the high⁃strength cold⁃formed thin⁃walled steel was proposed, and the calculation values were in good agreement with the test values. The research conclusion can provide reference for the engineering application of the photovoltaic bracket with the high⁃strength cold⁃formed thin⁃walled steel. [ABSTRACT FROM AUTHOR]

The paper investigates the shear mechanic performance of transformed triangular corrugated steel plates (TT-CSPs) with top stringers applied in the trestle, incorporating a comprehensive analysis of how plate dimensions and corrugation density affect both elastic and inelastic buckling capacities. By proposing and validating formulas for the ultimate shear-bearing capacity through finite element analysis (FEA), this paper advances a capacity prediction approach that accounts for the finite rigidity of top stringers by introducing a reduction factor. The results reveal that corrugation density significantly impacts both elastic buckling load and ultimate strength, with plate width playing a more crucial role than height in determining capacity. Furthermore, the inclusion of top-stringer flexural rigidity is shown to notably enhance the shear-bearing capacity of TT-CSPs, providing a vital consideration for their strength design. [Display omitted] • Proposed formula for global elastic shear buckling load of transformed triangular corrugated steel plates (TT-CSP) • Proposed a comprehensive design method to predict shear-bearing capacity of TT-CSPs, considering top stringer constraints • Study the impact of corrugated plate and corrugation dimensions on elastic and inelastic buckling capacity of TT-CSPs • Reveal the contribution of top stringers to shear resistance of built-up TT-CSPs [ABSTRACT FROM AUTHOR]

In der Bauindustrie hat der Einsatz von Fertigteilen viele Vorzüge gegenüber Ortbeton. Im Rahmen dieses Beitrags wird die Ausbildung des stumpfen Stoßes bei Fertigteilstützen betrachtet, die einer erhöhten Horizontalbeanspruchung ausgesetzt sind. In einem Rechenbeispiel werden verschiedene repräsentative Beanspruchungen für eine Geschossstütze näher untersucht und die Widerstände einer Stütze sowie einer stumpfen Stoßfuge mit Stahlplatte gegen Querkräfte dargestellt. Durch die Ableitung eines zulässigen Grenzverhältnisses HEd/ NEd werden die kritischen Lastfälle für die Stumpfstoßausbildung aufgezeigt. Es wird abgegrenzt, unter welchen Parametern nicht die Fugenschubtragfähigkeit, sondern die Querkrafttragfähigkeit innerhalb des Bauteils bemessungsmaßgebend wird. Zusätzlich wird ein alternativer Modellansatz für eine sehr glatte Stützenfuge vorgeschlagen und durch eine Bemessungstabelle anwenderfreundlich ausgewertet. A contribution to the investigation of the shear-bearing capacity of butt-jointed prefabricated columns with particular regard to an extraordinary impact load The use of pre-fabricated concrete elements has special advantages for the building industry. In this paper the butt-joint connection of prefabricated reinforced concrete columns under high horizontal stresses is focused. A calculation example demonstrates the representative loading cases and the shear design of a butt-jointed concrete column with a steel plate. Additionally it is differentiated under which situations not the shear bearing capacity of the joint but of the concrete element is decisive for the design. By determining an allowable maximum ratio HEd/ NEd the critical loading scenarios are shown and an alternative design model for very smooth column joints is presented and evaluated in an user-friendly chart. [ABSTRACT FROM AUTHOR]