Research on quasi-static test of reinforced concrete structural walls with shear-moment interaction
Du Ke1,2 Luo Huan1,2 Sun Jingjiang1,2 Liu Zhongwei1,2 Teng Nan1,2
1. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;
2. Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Harbin 150080, China
Abstract：The seismic behavior of shear wall structures subjected to lateral earthquake loads is different from that of moment frame structures. There is no inflection point in the shear walls, and the shear force and bending moment of shear walls appear in the form of coupling interaction for the entire walls. To study the effect of bending moment and axial compression ratio on the failure modes of shear walls, three 1:2 scale 2-story shear wall specimens, whose prototype structure is the bottom two stories of a 11-story high-rise building, are tested under the low-frequency cyclic quasi-static loads. Compared to the traditional quasi-static test, the quasi-static test conducted in this study retains the ratio of bending moment and shear force by two vertical actuators. The experimental test results show that for the test specimen SW1, which considers shear-moment interaction and has an axial compression ratio μ of 0.25, large amounts of horizontal and diagonal cracks may be observed and finally it may fail in lateral incremental collapse induced by flexural stiffness failure. For the test specimen SW2 (with shear-moment interaction, ?=0.5), the horizontal cracks running through the bottom of the wall can be seen and finally it may fail in the vertical progressive collapse caused by axial stiffness failure. For the test specimen SW3 (without shear-moment interaction, ?=0.25), numerous diagonal cracks can be observed and finally it may fail in the lateral incremental collapse due to shear stiffness failure. The response behaviors such as failure pattern, hysteretic characteristics, deformation capacity, energy dissipation, and section strain are investigated. The results show that the shear-moment interaction in shear walls has a significant influence on the key parameters such as failure pattern, yield strength, peak load, ultimate strength, and ductility of hear walls. It is recommended that shear-moment interaction should be considered in the designs and analyses of shear wall structures.
杜轲 骆欢 孙景江 刘仲伟 滕楠. 考虑弯剪耦合作用的RC剪力墙拟静力试验研究[J]. 土木工程学报, 2018, 51(7): 50-60.
Du Ke Luo Huan Sun Jingjiang Liu Zhongwei Teng Nan. Research on quasi-static test of reinforced concrete structural walls with shear-moment interaction. 土木工程学报, 2018, 51(7): 50-60.
