基于OpenSees的钢管混凝土柱-钢梁错层节点抗震性能有限元分析

为研究钢管混凝土柱-钢梁错层节点抗震性能,基于已有试验研究成果,利用OpenSees有限元软件,对钢管混凝土柱-钢梁错层节点进行数值模拟,将模拟结果与试验结果进行对比,两者较吻合。通过数值模拟,分析了轴压比、混凝土强度等级和钢材强度等参数对钢管混凝土柱-钢梁错层节点抗震性能的影响。结果表明:在轴压比为0.3～0.7范围内,随轴压比增大,结构承载力降低明显;随混凝土强度等级提高,试件极限承载力特征值增大较为明显,最大增幅达9.39%;通过对比发现,合理提高钢材强度可以有效增加结构承载力和延性,当模拟计算Q345钢材时,试件极限承载力增加了26.08%,破坏点位移值增加了8.41%。

Finite Element Analysis on Seismic Behavior of Concrete-Filled Steel Tube Column-Steel Beam Staggered Joints based on OpenSees

In order to study the seismic behavior of concrete-filled steel tubular column-steel beam staggered joints, based on the existing experimental research results, the OpenSees finite element software is used to numerically simulate the concrete-filled steel tubular column-steel beam staggered joints, and the simulation results are compared with the experimental results. The two are more consistent. Through numerical simulation, the effects of axial compression ratio, concrete strength grade and steel strength on the seismic behavior of concrete-filled steel tubular column-steel beam staggered joints are analyzed. The results show that the bearing capacity decreases with the increase of axial compression ratio in the range of 0.3~0.7. With the increase of concrete strength grade, the ultimate bearing capacity of specimens increases obviously, and the maximum increase is 9.39%. Through comparison, it is found that reasonable increase of strength steel can effectively increase the structural bearing capacity and ductility. When the Q345 steel is simulated, the ultimate bearing capacity of the test piece increases by 26.08%, and the displacement point of the damage point increases by 8.41%.