Nonlinear finite element analysis of hysteretic behavior of steel reinforced recycled concrete filled circular steel tubular composite columns

Subjects: Mechanics >> Solid Mechanics submitted time 2024-02-07 Cooperative journals: 《应用力学学报》

MA Hui

Abstract：
Based on the cyclic load testing of steel reinforced recycled concrete filled circular steel tube columns,the hysteretic performance of composite columns was numerically analyzed by using OpenSees software,and the hysteretic curves and performance indexes of composite columns were obtained. Compared with the experimental results,the rationality of the numerical model of the composite column was verified. On this basis,the influence levels of parameters on the hysteretic performance of composite columns were analyzed. The results showed that the replacement rate of recycled aggregate increased from 0 to 100%,the peak load of composite columns decreased by 7.78%,and the ductility decreased slightly. Improving the strength of recycled concrete,section steel and circular steel tube was beneficial to improving the bearing capacity and stiffness of composite columns,but it also increased the brittleness of composite columns. With the growth of axial compression ratio,the bearing capacity of composite columns increased first and then decreased,and the ductility decreased gradually. The steel ratio of section steel rose from 5.54% to 9.99%,and the peak load of composite columns increased by 24.34%,but it did not obviously improve the ductility of composite columns. Increasing the wall thickness of steel tube was beneficial to the bearing capacity and ductility of composite columns.

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