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为了评价复杂地震荷载作用下钢筋混凝土(RC)空心桥墩的抗震性能,对3根RC矩形空心桥墩进行了“回型”水平双向反复荷载作用下的拟静力试验,并基于有限元数值分析方法,研究了该类加载制度下RC矩形空心桥墩的水平力-位移滞回曲线,及双向弯曲作用下RC矩形空心截面的弯矩-曲率。分析探讨了轴压比、壁厚、双轴弯曲强度比参数影响下RC矩形空心桥墩的滞回特性、破坏特征和截面受力性能模拟结果,提出了“回型”水平双向加载下RC矩形空心桥墩的滞回曲线模型,该模型考虑了水平双向加载对构件强度、刚度和位移的耦合效应。应用该模型得到的RC矩形空心桥墩的水平力-位移骨架曲线和滞回曲线的计算值与试验结果吻合较好。
In order to evaluate the seismic behavior of reinforced concrete (RC) hollow piers under complex seismic loads, the quasi-static tests of three RC rectangular hollow piers under “double” loading are carried out. Based on the finite element analysis Analysis method, the horizontal force-displacement hysteretic curve of RC rectangular hollow piers under such loading system and the moment-curvature of RC rectangular hollow section under bidirectional bending are studied. The effects of axial compression ratio, wall thickness and biaxial bending strength ratio on the hysteretic characteristics, failure characteristics and mechanical behaviors of RC rectangular hollow piers are analyzed and discussed. The RC Hysteresis curve model of rectangular hollow piers. The model considers the coupling effect of horizontal bi-directional loading on strength, stiffness and displacement of members. The calculated values of horizontal force - displacement skeleton curve and hysteresis curve of RC rectangular hollow piers with this model are in good agreement with the experimental results.