考虑低周疲劳损伤效应的钢筋混凝土柱Park-Ang损伤修正模型  

Modified Park-Ang damage model considering low cycle fatigue damage effect of reinforced concrete columns

作　　者：朱汉波 缪长青[1,2] 白六涛 邵越风[1,2] Zhu Hanbo;Miao Changqing;Bai Liutao;Shao Yuefeng(Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 210096,China;School of Civil Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]东南大学土木工程学院,南京211189

出　　处：《东南大学学报（自然科学版）》2020年第1期71-80,共10页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51778135);中央高校基本科研业务费专项资金资助项目;江苏省研究生科研创新资助项目(KYLX16_0253、KYCX18_0113);国家重点研发计划资助项目(2017YFC0806001);江苏省自然科学基金资助项目(BK20160207);航空科学基金资助项目(20130969010)

摘　　要：针对现有钢筋混凝土构件损伤模型存在指标上下界不收敛、疲劳效应考虑不足等问题,提出了一种考虑低周疲劳效应的Park-Ang损伤修正模型.按照非线性叠加规律,调整模型最大变形和滞回耗能效应的组合形式.考虑低周疲劳效应的影响,通过遗传算法确定滞回耗能损伤的最优函数.以钢筋混凝土柱为研究对象,采用该修正模型进行了损伤评估,并与6种经典的损伤模型的评估结果进行了对比分析.结果表明,修正的Park-Ang模型适用于单调加载、变幅循环加载和等幅循环加载等各种加载路径的损伤评估,并且在构件失效状态的损伤计算误差小于10%,可以更准确地评估钢筋混凝土构件在任意加载路径下的损伤演化规律.To solve the problem of the existing damage models of reinforced concrete members that the upper and lower bounds of the index are not convergent and the fatigue response is considered insufficiently, the modified Park-Ang damage model considering the low cycle fatigue effect was proposed. According to the nonlinear superposition law, the combination of the model maximum deformation and the cyclic energy dissipation effect was adjusted. considering in the cyclic energy dissipation, the optimal function of the cyclic energy dissipation was determined by the genetic algorithm. Taking the reinforced concrete columns as the research objects, the damage model was used to evaluate the damage of columns, and compared with the evaluation results of six classical damage models. The results show that the modified Park-Ang model is suitable for damage assessment of various loading paths such as monotonic loading, variable amplitude cyclic loading, constant amplitude cyclic loading, and the calculated damage value at the failure state of the component is less than 10%. Therefore, this model can accurately evaluate the damage evolution law of reinforced concrete members under arbitrary loading paths.

关 键 词：钢筋混凝土柱 Park-Ang损伤修正模型 低周疲劳损伤效应 基于遗传算法的符号回归 

分 类 号：TU375.3[建筑科学—结构工程]