Experimental investigation on composite beams under combined negative bending and torsional moments

Abstract

In this study, straight composite steel-concrete beams were tested to investigate their mechanical performance under combined negative bending and torsional moments. Two specimens were used in this study, and different ratios between the applied negative bending and torsional moments were induced. Load and deflection relationships, strain development on the steel main girder and shear connectors (stud), and the slip development on the steel-concrete interface were recorded in the test and reported in this paper. The results indicate that increase of torsional moment will result in the significant decrease of the load-carrying capacities (e.g. yield load and ultimate load) of the specimens. It was also found that the normal strains of stud shear connectors in such beams are very large and non-negligible compared to their shear strains. In addition, the maximum interface slip was found occurring at around the 1/4 span, and the support conditions and serious crack of the concrete were considered to be the main causes. The research results obtained in this study can provide references for the design and analysis of steel-concrete composite beams subjected to the combined negative bending and torsional moments.

Effects of Recycled Concrete on Structural Behavior of Composite Beams with Y-Rib Shear Connectors

“…A rebar with (Ø 10 mm) diameter used as Y-rib, while (Ø 20 mm) was used for Stud Shear as in Fig. (6). The shear reinforcement bar formed to give a Y-type shape as in Figure (7).…”

Effect of Openings on the Torsional Behavior of SCC Box Beams Under Monotonic and Repeated Loading

“…The torque capacity was reduced by 23% and 30% for circular openings with a dimension of 100 mm when the opening is at the center and the clear span of the beams, respectively. Lin (2020) [21] conducted an experimental study on composite steel-concrete beams under combined negative bending and torsion. Two beams were used in this study, and the variable was the difference in the amounts of applied negative bending and torsion on the tested specimens.…”

Numerical-analytical method in reinforced concrete mechanics

“…http://doi.org/10.22363/1815-5235-2022-18-6-525-533 Введение В связи с все более широким внедрением компьютерных технологий в практику проектирования железобетонных конструкций для повышения их безопасности, учет физических процессов и особенностей их силового сопротивления становится все более актуальной проблемой. В практике современного компьютерного моделирования уже имеются ряд вычислительных комплексов, в которых используют конечно-элементные модели железобетона, но еще недостаточно привлекают современные физические модели, в частности расчетные модели сопротивления плосконапряженного и сложно напряженного железобетона 1 [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”