不同RAC强度方钢管RAC框架抗震性能试验及有限元分析

Experimental and Finite Element Study on Seismic Behavior of RAC Filled Square Steel Tube Frame with Different RAC Strength

以RAC强度等级为变化参数,设计制作了2榀不同RAC强度的方钢管RAC框架,并对其进行低周反复加载试验,获取其各项抗震性能指标;随后利用有限元软件ABAQUS对试验结果进行验证,有限元分析结果和试验结果吻合良好,证明所建立的有限元模型的准确性,在此基础之上,利用有限元软件ABAQUS对其进行拓展分析.主要研究表明：方钢管RAC框架具有良好的抗震耗能性能,框架破坏时的平均层间位移转角在1/39~1/38,表现出了良好的抗倒塌性能;试件的承载能力随着RAC强度等级的增加会逐渐提升,但上升幅度不是很大,而其延性则会随着RAC强度等级的增加而逐渐下降,与此同时,RAC强度对试件初始阶段的荷载—位移曲线、刚度退化速率及破坏后的残余刚度影响相对较小.

Two RAC filled square steel tube frames with the changing parameter of different RAC strength was designed under cyclic reversed loading. Different seismic behavior indexes of specimens were obtained. Then finite element software ABAQUS was used to verify the test results. The ABAQUS analysis results have good agreement with the test results which prove the accuracy of finite element model. Based on the foundation,ABAQUS was use to expand the analysis. The results mainly show that RAC filled square steel tube frames have good energy consumption ability. The average interlayer displacement angle was 1/39 ~ 1/38 when the frame destroyed which presents good collapse resistance ability. The bearing capacity of specimens gradually improves with the increase of RAC strength,but the rising range is little. The ductility gradually decreases with the increase of RAC strength. At the same time,RAC strength has little effect to the load-displacement curve at initial stage,stiffness degradation rate and residual stiffness after the specimen damaging.