梁不同扩张比蜂窝门式刚架抗震性能分析

ANALYSIS OF SEISMIC BEHAVIOR OF CASTELLATED STEEL PORTAL FRAME WITH DIFFERENT EXPANSION RATIOS OF BEAM

通过设置蜂窝门式刚架梁不同扩张比,采用ABAQUS有限元软件模拟分析梁扩张比对蜂窝门式刚架整体抗震性能的影响。研究了蜂窝门式刚架在水平循环荷载作用下的破坏规律,对比分析了各个模型的滞回曲线、骨架曲线、刚度退化、延性和耗能能力。研究结果表明:蜂窝门式刚架较原实腹刚架屈服荷载提高了15.2%~33.3%,极限荷载提高了9.2%~28.5%;梁扩张比小于1.45时,扩张比越大承载力越高,扩张比超过1.45时,随扩张比越大承载力下降;扩张比在1.3~1.4范围内蜂窝门式刚架整体受力较为合理。

By setting the different expansion ratio of the castellated beams,the finite element software ABAQUS was used to simulate and analyze the effect of beam expansion ratio on the overall seismic behavior of castellated portal frame.The paper studied the failure law of castellated portal frame under horizontal cyclic loading,and the hysteresis curve,skeleton curve,stiffness degradation,ductility and energy dissipation capacity of each model were compared and analyzed.The results showed that the load of the castellated portal frame was higher than that of the original rigid frame,and the yield load was increased by 15. 2% to 33. 3% the ultimate load was increased by 9. 2% to 28. 5%. In the range of 1. 45,the greater the expansion ratio was,the higher the bearing capacity was. The bearing capacity would decrease if the expansion ratio was more than 1. 45. The force performance of castellated portal frame was more reasonable at the expansion ratio in the range of 1. 3 to 1. 4.