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在反复荷载作用下,由于累积损伤方钢管混凝土柱的承载力会显著退化。本文采用6种不同加载路径模拟地震作用,考察了初始位移大小、位移幅值增量、单侧或双侧反复加载等不同加载路径对方钢管混凝土柱承载力退化的影响。分析结果表明:随着加载初始位移增加、加载幅值增量减小,方钢管混凝土承载力退化显著增加;双侧加载较单侧加载承载力降低更显著;使用位移延性系数无法有效评价加载路径对构件承载力退化的影响;累积延性系数及有效累积耗能体现了累积滞回耗能对构件承载力退化的影响,但不能考虑位移幅值大小对承载力退化的影响。
Under repeated loading, the bearing capacity of CFST columns due to cumulative damage will be significantly degraded. In this paper, six kinds of loading paths are used to simulate the earthquake action. The effects of initial displacement, incremental displacement amplitude and unilateral or two-sided repeated loading on the degeneration of the bearing capacity of CFST columns are investigated. The results show that with the increase of initial load, the increment of load amplitude decreases and the load-bearing capacity of square concrete filled steel tube decreases remarkably. The decrease of bearing capacity of unilateral loading is more significant than that of unilateral loading. The displacement ductility coefficient can not effectively evaluate the loading path The effect of cumulative hysteretic energy on the degradation of the bearing capacity of the members is shown by the cumulative ductility coefficient and the effective cumulative energy loss. However, the influence of the magnitude of displacement on the bearing capacity degradation can not be considered.