翼缘连接板削弱型上焊下栓钢梁柱节点抗震性能有限元分析

Finite element analysis of seismic performance of weakened flange connection plate upper welded lower bolted steel beam column

摘要:

研究下翼缘板连接板削弱型钢梁柱“上焊下栓”节点抗震性能,为加短悬臂梁型钢梁柱节点的设计和工程应用提供参考。利用有限元软件ABAQUS,在数值模拟与试验结果吻合的基础上,分析下翼缘板连接板削弱长度、框架梁截面形状对上焊下栓钢梁柱节点抗震性能的影响。下翼缘板连接板削弱长度过短则无法起到塑性铰外移的作用,下翼缘板连接板削弱长度过长会导致严重的平面外屈曲。梁全截面削弱组的抗震性能优于半截面削弱组与无变化组。合理布置下翼缘板连接板削弱区长度与框架梁截面形状可以有效的提升“上焊下栓”钢梁柱节点的抗震性能。

Abstract:

Research on the seismic performance of weakened steel beam-column "upper welded and lower bolted" joints with lower flange plate connection plates, providing reference for the design and engineering application of shortened cantilever beam steel beam-column joints. Using the finite element software ABAQUS, based on the consistency between numerical simulation and experimental results, the effects of the weakened length of the lower flange plate connection plate and the cross-sectional shape of the frame beam on the seismic performance of the upper welded and lower bolted steel beam column joints were analyzed. If the weakening length of the lower flange plate connecting plate is too short, it cannot play the role of plastic hinge outward movement. If the weakening length of the lower flange plate connecting plate is too long, it will lead to serious out of plane buckling. The seismic performance of the beam full section weakening group is better than that of the half section weakening group and the unchanged group. Reasonably arranging the length of the weakened area of the lower flange plate connection plate and the cross-sectional shape of the frame beam can effectively improve the seismic performance of the "welded up and bolted down" steel beam column joints.