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进行了8个核心型钢混凝土(CSRC)柱试件和1个RC柱试件的低周反复加载试验。主要试验参数包括轴压比、核心型钢配钢率和核心型钢截面形式。通过试验结果研究了不同参数对CSRC柱强度、刚度、延性、滞回特性、耗能能力和轴向变形性能等的影响。研究结果表明,设置核心型钢可有效提高RC柱的变形能力、滞回耗能能力和弹塑性阶段竖向承载能力的稳定性,从而可有效提高RC柱的轴压比限值。基于试验结果和前人的研究成果,建立了能够考虑核心型钢配钢率和轴压比对滞回特性影响的核心型钢柱恢复力模型。该模型可以反映CSRC柱在地震反复荷载作用下强度和刚度的退化,试件计算骨架曲线和滞回曲线与试验量测结果吻合良好,可为CSRC结构的弹塑性地震反应分析提供参考。
Low-cycle cyclic loading tests were carried out on 8 core steel reinforced concrete (CSRC) columns and 1 RC column. The main test parameters include the axial pressure ratio, the ratio of the core steel and the core section steel cross-section form. The influence of different parameters on the strength, stiffness, ductility, hysteretic behavior, energy dissipation capacity and axial deformation performance of CSRC columns was studied by the test results. The results show that setting the core steel can effectively improve the deformation ability, hysteretic energy dissipation capacity and vertical bearing capacity of the RC column, which can effectively improve the axial compression ratio of the RC column. Based on the test results and previous research results, a model of core steel post-restoring force that can consider the effect of steel distribution ratio and axial compression ratio on hysteretic behavior of core steel was established. The model can reflect the degradation of the strength and stiffness of the CSRC column under repeated seismic loads. The calculated skeleton curves and the hysteresis curves agree well with the experimental measurements, which can provide a reference for the elasto-plastic seismic response analysis of CSRC structures.