基于变梁异型节点子结构的钢管混凝土柱-钢梁框架结构抗震性能分析

Seismic performance analysis on concrete-filled steel tube column and steel beam frame based on abnormal frame joint substructures

基于OpenSees建立1榀两跨三层框架结构数值模型并以有限元模拟验证建模合理性,分析了异型节点梁高比、柱截面尺寸、轴压比的改变对钢管混凝土柱-不等高钢梁框架结构抗震性能的影响。结果表明,提高节点梁高比或柱截面尺寸均可同时提高框架和节点承载力,但节点自身延性略有下降,而轴压比越大,框架和节点承载力降幅越明显,刚度退化严重,延性大幅降低。

Based on OpenSees,a numerical model of one-thin,two-span,three-story frame structure was established,and the modeling rationality was verified by finite element simulation.The effects of changes in the depth ratio of abnormal frame joint beams,cross-sectional dimensions of column,and axial compression ratios on the seismic performance of concrete-filled steel tube columns and unequal height steel beam frames were analyzed.The results show that with the increase of the depth ratio of beam or the size of the column section,the bearing capacity of the frame and the node increases,while the ductility of the node itself decreases slightly.The higher the axial compression ratio,the more obvious the reduction of the frame and node bearing capacity,and the more serious the degradation of stiffness and ductility.