方钢管再生混凝土框架柱的非线性有限元分析

Nonlinear Finite Element Analysis for Recycled Aggregate Concrete Filled Square Steel Tube Frame Columns

为进一步研究方钢管再生混凝土框架柱在地震反复荷载下的抗震性能,基于试验结果,选择合理的材料本构关系及破坏准则,采用有限元软件ABAQUS对试验中框架柱的抗震性能进行非线性分析,得到其荷载-位移滞回曲线。在此基础上对方钢管再生混凝土框架柱进行了参数分析,分析了核心混凝土等级、再生骨料替代率这2个参数对框架柱抗震性能的影响。研究结果表明,该模型的计算结果较为准确,计算得到的荷载-位移滞回曲线与试验实测结果吻合较好;提高核心混凝土等级,试件的承载力提高明显,但后期变形能力差,延性较差;增大再生骨料替代率可以明显改善试件的延性,但会降低试件所能达到的极限荷载。研究结果可供实际工程需要及试验设计参考。

In order to study the seismic behavior of recycled aggregate concrete filled square steel tube( RACFST) frame columns under cyclic reversed loading,based on experiment result,the rational constitutive relation of material and failure criterion are chosen,nonlinear finite element analysis of recycled aggregate concrete filled square steel tube frame columns is carried out by ABAQUS software,and hysteretic curve is obtained. The influence of concrete grade and recycled coarse aggregate replacement percentage of RACFST frame columns are analyzed through the calculation model. The results show that the simulated hysteretic curves are in good agreement with the experimental date. With the increasing of the concrete grade,the bearing capacity improves obviously,but the deformability and ductility become worse. With the increasing of recycled coarse aggregate replacement percentage,the ductility of specimen would be improved obviously,but the bearing capacity would be reduced. The results of nonlinear FEM analyses provides reference for experimental and engineering design.