异形钢桁架-混凝土组合剪力墙剪力滞后效应及骨架曲线

Shear Lag Effect and Skeleton Curve of Special Shaped Steel Truss-Concrete Composite Shear Wall

摘要:

为探明异形钢桁架?混凝土组合剪力墙的受力性能，对剪力滞后效应及骨架曲线进行研究。基于最小势能原理，采用能量变分法计算翼缘内纵向应力分布，引入有效系数考虑翼缘端部型钢竖杆在墙体抵抗水平荷载中的作用，按照平截面假定分析剪力墙底部截面在不同受力状态下的应力和应变分布，得到了截面的弯矩?曲率关系；根据弯矩计算墙顶荷载，再由墙体曲率分布及剪切刚度计算墙顶位移；以开裂点、屈服点、峰值点、极限点为特征点，建立了考虑剪力滞后效应的骨架曲线分析方法，试验表明，该方法能较为准确地预测异形钢桁架?混凝土组合剪力墙的力学性能。

Abstract:

To investigate the mechanical performance of composite shear walls with irregular steel trusses and concrete， the shear lag effect and skeleton curve were studied. Based on the principle of minimum potential energy， the energy variational method was used to calculate the longitudinal stress distribution inside the flange. The effective coefficient was introduced to consider the role of the end section steel vertical rod of the flange in resisting horizontal loads on the wall. The stress and strain distribution of the bottom section of the shear wall in different stress states were analyzed according to the assumption of a plane section， and the moment curvature relationship of the section was obtained. The load on the top of the wall was calculated based on the bending moment， while the displacement of the top of the wall was calculated based on the curvature distribution and shear stiffness of the wall. A skeleton curve analysis method considering shear lag effect was established based on the characteristic points of cracking point， yield point， peak point， and limit point. Experimental results show that this method can accurately predict the mechanical performance of special-shaped steel trusses-composite shear wall.