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中文摘要：
将钢筋混凝土结构的等效延性破坏准则应用于钢管混凝土圆柱的低周疲劳寿命分析，提出了钢管混凝土圆柱的低周疲劳寿命计算方法，综合考虑了结构的首超破坏和累积损伤。建立了钢管混凝土圆柱的低周疲劳寿命拟合曲线，拟合公式的相关系数为0．971；通过23根钢管混凝土圆柱的低周疲劳试验结果对提出的计算方法进行了验证。结果表明：建议计算模型能够较好地反映钢管混凝土圆柱在不同位移延性水平下的疲劳寿命。
英文摘要：
Applying the equivalent ductility failure criterion of the reinforced concrete （RC） structure to the low-cycle fatigue life of concrete-filled steel tubular （CFST） circular columns, the computing method of the low-cycle fatigue life of CFST circular columns was presented. The first excursion failure and cumulative damage were comprehensively taken into account. The fitted curve of the low-cycle fatigue life of CFST circular columns was built, and the correlation coefficient of the fitted formula was 0. 971. In addition, the suggested computing method was verified using low-cycle fatigue experiment data of 23 CFST circular columns. Results shows that the suggested computing model can better reflect the fatigue life of CFST circular columns under different displacement ductilities.
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