轴压比对矩形钢管混凝土框架受力性能影响的有限元分析

Finite Element Analysis of Influence of Axial Load Level on Mechanical Behavior of Concrete-filled Rectangular Tubular Frame

基于一榀单跨两层矩形钢管混凝土框架的抗震性能试验,利用通用有限元软件ABAQUS建立了框架的非线性有限元分析模型,模型中考虑了混凝土反复荷载下的刚度退化。通过与试验结果的对比分析,验证了该模型的正确性,可以用于矩形钢管混凝土框架的结构分析中。利用该模型对不同轴压比下框架的骨架曲线进行了对比,并对其受力性能进行了分析,结果表明:随着轴压比的增大,框架的延性和承载力随之降低。

Based on the model experiment on seismic behavior of a 1-span,2-story concrete-filled rectangular steel tubal（CFRST）frame under lateral cyclic loads,A 3-D nonlinear finite element model of concret-filled rectangular steel tubular frame is proposed in the paper.Compared with the experimental hysteresis curve,the computational results are found to be accurate,which shows that this model proposed in the paper can be applied in structure analysis of concrete-filled rectangular tubular frames.So the model was used in the finite element analysis of concrete-filled rectangular frame with different axial load level.Compared the computational displacement envelop curves,it concludes that the ductility and bearing capacity of CFRT frames reduces with the increasing axial load level.