钢桁架连梁-剪力墙结构低周反复荷载试验与抗震性能研究

Cyclic loading experiment on seismic behavior of shear wall with steel truss coupling beam

钢桁架作为剪力墙连梁具有优良的耗能性能,但其对剪力墙力学性能的影响尚不明确,为了研究剪力墙结构的抗震性能,建立了两个单跨两层剪力墙模型,该模型分别采用了刚度相同的钢桁架连梁与普通钢筋混凝土连梁。采用倒三角加载形式,对模型进行低周反复荷载试验,对比研究了两者的裂缝发展规律、破坏形态、滞回耗能、延性、刚度退化及承载力退化性能,得到了连梁的破坏机理,并对结构的抗震性能进行了评估。试验结果表明,钢桁架连梁-剪力墙结构具有优良的抗震性能,改善了钢筋混凝土连梁-剪力墙结构的受力分布、刚度退化及承载力退化性能,增强了变形性能,提高了延性及耗能性能。

The influences on mechanical properties of shear walls exerted by steel truss coupling beam are still not clear, though the steel truss has excellent energy dissipating capacity. In order to study the seismic performance of shear walls with different coupling beams, two one-span and two-storey shear walls models with concrete coupling beams and steel truss coupling beams have been built. The cyclic loading pattern of inverted triangle is adopted to simulate the pattern of earthquake forces and to study crack developing laws, failure mode, energy dissipation, ductility, stiffness degradation and bearing capacity degradation. The research results show that shear walls with steel truss coupling beam have better seismic behavior, which improve mechanical property and increase energy dis- sipation capacity and ductility.