装配式钢骨混凝土柱在不同轴压比作用下的抗震性能分析

Seismic performance analysis of assembled steel reinforced concrete columns under different axial compression ratios

为研究轴压比对一种新型预制装配式钢骨混凝土柱(Prefabricated Steel Reinforced Concrete Column,PSRCC)抗震性能的影响规律,借助ABAQUS有限元软件对5个PSRCC试件进行了低周往复循环试验,分析了轴压比对新型PSRCC试件滞回性能、骨架曲线、延性变形等抗震性能指标的影响。研究结果显示,各PSRCC试件具有良好的变形及能量耗散能力,其平均延性系数在7.31~13.11之间,等效黏滞阻尼系数在0.245~0.295之间。随着轴压比的增大,各PSRCC试件的承载力先增大后降低;当轴压比增加到0.4时,峰值承载力最大,增大幅度为6.31%。同时,PSRCC试件初始刚度的增大幅度为60.34%,能量耗散和塑性变形性能降低明显。

This study investigates the influence of axial compression ratio on the seismic performance of a new type of prefabricated steel reinforced concrete column(PSRCC)with the use of ABAQUS finite element software.Low-cycle reciprocating cyclic test for the five PSRCC specimens is performed,and the influence of axial compression ratio on the hysteretic performance,skeleton curve,ductility deformation and other seismic performance indexes of the new type of PSRCC is analyzed.The results show that the hysteretic curves for the five PSRCC specimens are full.The plastic deformation ability and energy dissipation ability for the five PSRCC specimens are strong,and the stiffness degradation performance is stable.The average ductility coefficient is between 7.31 and 13.11,and the equivalent viscous damping coefficient is between 0.245 and 0.295.With the increase of axial compression ratio,the bearing capacity of PSRCC increases at the beginning and then decreases.When the axial compression ratio is 0.4,the peak bearing capacity is the largest with an increase of 6.31%.Meanwhile,when the initial stiffness of PSRCC increases by 60.34%,and the energy dissipation and plastic deformation performance decrease obviously.