纵向板-矩形管节点拟静力试验的数值模拟

提出了准确模拟纵向板-矩形管节点拟静力试验的有限元方法。为分析管结构的抗震性能,对纵向板-矩形管节点进行了拟静力试验。对每个试件,裂纹出现在弦管连接表面,沿弦管与节点板的连接焊缝扩展,并导致性能退化及破坏。为模拟钢材的损伤累积及其产生的裂纹扩展,基于混合强化准则和简化的勒迈特损伤模型,建立了自定义本构模型并嵌入ANSYS程序。采用此本构模型对纵向板-矩形管节点的拟静力试验进行数值模拟,计算出的滞回曲线与试验曲线吻合较好。

Numerical simulation of quasi-static tests of longitudinal plate-to-RHS connections

Finite element(FE)method for simulating the quasi-static tests of longitudinal plate-to-RHS(rectangular hollow section)connections accurately is presented.For analyzing the seismic behavior of tubular structures,quasi-static tests on longitudinal plate-to-RHS connections were carried out.For each specimen,cracks appeared on the chord connecting face,and extended along the weld connecting the plate and chord,which led to the performance degradation and failure of the connection.To simulate the damage accumulation of steel and crack propagation,a constitutive model based on the mixed hardening rule and simplified Lemaitre's damage model was incorporated into an ANSYS user subroutine.The quasi-static tests of longitudinal plate-to-RHS connections are simulated using above constitutive model.The calculated hysteretic curves agree well with the experimental curves.