SHCC局部增强PEC梁柱节点抗震性能有限元分析

Finite Element Analysis on the Seismic Performance of SHCC Reinforced PEC Beam-Column Joints

为研究部分包覆钢-混凝土组合结构端板连接梁柱节点的抗震性能,参考相关试验数据并采用ABAQUS软件,建立相应的有限元分析模型对梁柱节点进行模拟研究,通过与试验结果的对比验证有限元模型的准确性;后续基于所建立的有限元模型,置换梁柱节点域的普通混凝土为应变硬化水泥基复合材料(SHCC),探究SHCC对梁柱节点抗震性能的改善作用,同时考察不同置换长度对梁柱节点抗震性能的提升作用。研究结果表明:采用SHCC置换PEC梁柱节点使得其承载力、延性系数均有不同程度的提高,能量耗散系数在进入塑性阶段后也开始逐步增大,整体梁柱节点的抗震性能更为出色;当置换长度在两倍的梁高范围内时增强效果最好。数值模拟结果可为后续试验研究及实际工程应用提供参考。

In order to study the seismic performance of the partially-encased composite(PEC)beam-column joints bolted with end-plates,a quasi-static test is carried out on the joints,and the finite element software ABAQUS is used to build the corresponding finite element model to compare with experiment results. Based on the finite element analysis,the regular concrete is replaced in the beam-column joint area with the new strain-hardening cementitious composites(SHCC)to study the influence of the SHCC on the seismic performance of beam-column joint,and investigate the effect of different replacement lengths on the seismic performance of beam-column joint. The research result shows that the capacity,ductility,and energy dissipation coefficient of PEC beam-column joint have been improved after replacing SHCC in the joint area,and the seismic performance of the joint is better. Also,the result shows that the seismic performance is optimized when the length of SHCC is twice of the beam height. This study provides a reference for similar experimental research and engineering practice.