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为研究圆钢管再生混凝土柱的抗震性能,以再生粗骨料取代率、长细比、轴压比和含钢率为变化参数,开展了10个圆钢管再生混凝土柱试件的拟静力试验.观察试件的破坏形态,获取滞回曲线和骨架曲线等抗震性能指标.在试验研究的基础上,结合课题组给出的不同取代率下核心再生混凝土的受压本构关系,采用有限元软件ABAQUS对试件的抗震性能进行分析.研究结果表明:试件的破坏形态与普通圆钢管混凝土柱相似,圆钢管底部鼓曲破坏,再生混凝土底部被压碎;试验实测的滞回曲线饱满,骨架曲线完整,计算得到的滞回曲线和骨架曲线与其吻合较好,采用本文所建立的ABAQUS有限元模型对圆RACFST柱进行抗震性能分析是可行的.
In order to study the seismic behavior of recycled concrete columns with round steel tubes, the pseudo-static tests of ten specimens of recycled concrete columns with circular steel tubes were carried out by taking the replacement ratio, slenderness ratio, axial compression ratio and steel content of recycled coarse aggregate as parameters The failure modes of the specimens were observed, and the seismic performance indexes such as hysteresis curve and skeleton curve were obtained.On the basis of the experimental research, combined with the pressure constitutive relation of the core recycled concrete under different substitution rates given by the research group, ABAQUS software is used to analyze the seismic performance of the specimens.The results show that the failure modes of the specimens are similar to that of ordinary CFST columns and the bottom of the round tube is damaged by drum buckling and the bottom of regenerated concrete is crushed.The measured hysteresis curve is full, The skeleton curve is complete, and the calculated hysteresis curve and skeleton curve are in good agreement with each other. It is feasible to use the ABAQUS finite element model established in this paper to analyze the seismic performance of circular RACFST column.