底框-斜向网格复合墙体抗震性能试验研究

Experimental research on seismic performance of bottom-frame diagonal-grid composite walls

通过对1/2比例底框-斜向网格复合墙体和相同尺寸的常规底框-密肋复合墙体进行拟静力对比试验,分析底框-斜向网格复合墙体的荷载-位移曲线特点和破坏过程,研究该复合墙体的滞回曲线、骨架曲线、承载能力、刚度退化、耗能能力、延性和钢筋应变规律等。试验结果表明:底框-斜向网格复合墙体具有很好的协同工作能力,充分体现了多重抗震防线的特点。与常规底框-正交网格复合墙体相比,相同截面尺寸及配筋的底框-斜向网格复合墙体的承载力增加了20%以上,刚度增加了约10%,耗能能力提高了约30%,同时位移延性系数减小了12%。

Base on the quasi-static contrast tests of a 1/2 scaled bottom-frame diagonal-grid composite wall and an original bottom-frame multi-grid composite wall, which were in the same size and scale, loading displacement curves characteristic and failure process of the specimens were analyzed. The seismic performance including hysteretic curves, skeleton curves, bearing capacity, stiffness degradation, energy-dissipating capacity, ductility and strain-load curves of steel bars were investigated. The test results indicate that the bottom-frame diagonal-grid composite wall has good capability of interoperability and shows advantages of multiple lateral force resisting systems. It is also found that the bearing capacity of the bottom-frame diagonal-grid composite wall is 20% higher than that of the normal bottom-frame multi-grid composite wall. Moreover, the stiffness and energy-dissipating capacities are increased by about 10% and 30%. At the same time, the ductility coefficient has a 12% decrease because of the existence of the diagonal-grid.