基于延性破坏准则的钢管混凝土圆柱低周疲劳寿命研究  

Research on Low-cycle Fatigue Life of CFST Circular Columns Based on Ductility Failure Criterion

作　　者：邢国华[1] 冉俣[1] 寇文飞[1] 付国[1] 刘伯权[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑科学与工程学报》2013年第2期28-34,共7页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51078037;51108032);中央高校基本科研业务费专项资金项目(CHD2012ZD009);长安大学基础研究支持计划专项基金项目(2012)

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。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.

关 键 词：钢管混凝土圆柱 延性 低周疲劳寿命 破坏准则 屈服曲率 

分 类 号：TU392.3[建筑科学—结构工程]