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由于现有的钢管混凝土柱损伤模型中存在损伤计算不收敛、缺乏对构件不同性能水平量化分析等问题,本文结合64个圆钢管混凝土试件,以试件钢管破坏现象、承载力变化和侧移等指标,建立了钢管混凝土柱试件损坏程度、破坏现象与损伤指数对应关系,并提出基于刚度退化与滞回耗能指标的S-E双参数损伤模型(S与E分别为stiffness和energy的缩写),最后通过低周反复试验试件、低周疲劳试验试件以及一榀框架结构试验试件验证了S—E损伤模型的合理性。结果表明,本文提出的损伤模型计算曲线与试件实际损伤曲线吻合良好,能合理评估构件不同阶段的损坏程度,为进一步研究地震作用下钢管混凝土柱的损伤评估提供参考。
Due to the non-convergence of the damage calculation and the lack of quantitative analysis of the different performance levels of the existing CFST column damage models, 64 concrete-filled CFST specimens are used in this paper to analyze the failure phenomenon of the steel tubes, the change of bearing capacity and the lateral displacement And other indicators, the corresponding relationship between the damage degree of the concrete filled steel tubular specimens and the damage index was established. Based on the stiffness degeneration and hysteresis energy dissipation index, the SE double parameter damage model was proposed (S and E are the abbreviations of stiffness and energy, respectively) Finally, the rationality of the S-E damage model was verified by low-cycle repeated test specimens, low-cycle fatigue test specimens and one-frame test specimens. The results show that the calculated damage curve presented in this paper is in good agreement with the actual damage curve of the specimen and can reasonably assess the damage degree of the different stages of the member, providing a reference for further study on the damage assessment of concrete filled steel tube column under earthquake action.