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为研究型钢高强高性能混凝土框架柱的抗震特性,基于已进行的9榀型钢高强高性能混凝土框架柱低周反复加载试验结果,进一步分析了其滞回特性,并将其骨架曲线简化为带下降段的理想三折线型骨架曲线模型,给出了骨架曲线的确定方法,同时简化了滞回环。通过引入基于损伤的循环退化指数对构件在反复荷载作用下的屈服荷载、硬化刚度、卸载刚度、再加载刚度以及承载力等各项力学性能指标的退化规律进行了描述,建立了基于损伤的型钢高强高性能混凝土框架柱的恢复力模型,给出了具体的滞回规则。结合试验结果,对恢复力模型的有效性进行了验证。研究结果表明:该模型能够较好地描述型钢高强高性能混凝土框架柱在反复荷载作用下的滞回特性,研究结果可为该类结构的弹塑性时程分析提供理论参考。
In order to study the seismic behavior of steel reinforced high-strength high-performance concrete columns, the hysteresis characteristics of 9-section steel high-strength and high-performance concrete (CFST) frame columns under cyclic loading were analyzed and its skeleton curve was simplified as Section of the ideal tri-fold line skeleton curve model, given the skeleton curve to determine the method, while simplifying the hysteresis loop. By introducing the cyclic degradation index based on damage, the degradation laws of various mechanical properties such as yield load, hardening stiffness, unloading stiffness, reloading stiffness and bearing capacity under repeated loading are described. The restoring force model of high strength and high performance concrete frame columns gives the specific hysteretic rules. Combined with the test results, the effectiveness of the restoring force model is verified. The results show that the model can describe the hysteretic behavior of high strength and high performance steel reinforced concrete columns under repeated loading. The results provide a theoretical reference for elastoplastic analysis of such structures.