钢桁架连梁-剪力墙结构受力性能的数值模拟

Numerical simulation on mechanical behavior of shear wall with steel truss coupling beam

利用数值模拟技术,建立了两个单跨两层钢筋混凝土连梁和钢桁架连梁的剪力墙结构的有限元模型,对比了二者在循环荷载作用下的受力性能,并分析了轴压比、连梁截面尺寸对剪力墙结构的承载力和变形性能的影响规律.分析结果表明:钢桁架连梁的剪力墙较钢筋混凝土连梁的剪力墙,其承载力虽有所降低,但在很大程度上降低了剪力墙的应力和损伤,且其耗能性能和延性均有大幅的提高;轴压比的增大对剪力墙承载力有所提高,但不成比例;钢桁架连梁腹杆截面尺寸对剪力墙结构的承载力有很大影响,弦杆截面尺寸的影响不显著.研究结果对剪力墙的抗震性能的设计计算具有一定的参考价值.

Finite element models of single span and two-storey shear walls with concrete coupling beams and steel truss coupling beams are established for comparing mechanical behaviors of the two types of coupling beams under cyclic loads and studying influences of axial compression ratio and section sizes of steel truss coupling beam on bearing capacities and deformation properties of shear walls. The studies show that shear walls with steel truss coupling beams reduce bearing capacities slightly but cut down stress and damages and ductility and substantially enhance energy dissipation behavior compared with shear walls with concrete coupling beams. In addition, bearing capacities of shear wails improve with the increase of axial compression ratio disproportionately and section size of ventral poles has a great effect on bearing capacities of shear walls but that of the chords reverses. The research results have a certain value on seismic design of shear walls.