考虑弯剪耦合作用的RC剪力墙拟静力试验研究

剪力墙结构在水平地震作用下受力与框架柱有很大的不同，无反弯点，弯矩与剪力的耦合作用贯穿整个墙体。为了探究弯矩和轴压比对剪力墙破坏的影响，取某11层高层建筑的底部两层剪力墙，按照1:2缩尺，设计了三个两层剪力墙试件并进行低周往复加载拟静力试验。与传统拟静力试验相比，该试验竖直方向加载通过两个作动器实现弯矩与水平剪力保持固定比例关系。试验结果表明，考虑弯剪耦合作用、轴压比为0.25的试件SW1破坏时有大量水平裂缝及斜裂缝，试件最终发生弯曲破坏型侧向倒塌。考虑弯剪耦合作用、轴压比为0.5的试件SW2破坏时为贯通水平裂缝，试件最终发生脆性竖向倒塌。不考虑弯矩作用、轴压比为0.25试件SW3破坏时有大量斜裂缝，试件最终发生弯剪破坏型侧向倒塌。该文对其破坏形态、滞回特性、变形能力、耗能能力、截面应变等进行了研究，研究结果表明弯矩作用对剪力墙的破坏模式以及屈服、峰值、极限荷载、延性等参数都有重大影响，建议剪力墙在分析和设计中应考虑弯剪耦合作用。

Research on quasi-static test of reinforced concrete structural walls with shear-moment interaction

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.