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基于前文对空心普通和再生钢管混凝土柱抗震性能的试验和有限元分析,对空心普通和再生钢管混凝土压弯构件的抗震性能进行了理论研究。首先,运用瑞利-利兹法和极限平衡理论等方法对压弯构件在单调荷载作用下的荷载-位移曲线进行了全过程分析。结合有限元参数分析结果,提出了空心普通和再生钢管混凝土压弯构件骨架曲线理论模型和位移延性系数简化计算公式,可为空心钢管混凝土结构工程实践和相关规程的修订提供理论参考。
Based on the previous experiments and finite element analysis of the seismic behavior of hollow ordinary and recycled concrete filled steel tubular columns, the seismic behavior of hollow normal and recycled concrete filled steel tubular members is studied theoretically. First, the whole process of load-displacement curves under the monotonic load is analyzed by Rayleigh-Leitz method and limit equilibrium theory. Based on the results of finite element analysis, a theoretical model and a simplified calculation formula for the displacement ductility coefficient of hollow normal and recycled concrete filled steel tube (CFST) members are presented. The results can provide theoretical reference for engineering practice of hollow CFR structure and revision of relevant regulations.