【作者】 陈杰； 庞森； 吴洁琼； 刁波；

【Author】 CHEN Jie;PANG Sen;WU Jie-qiong;DIAO Bo;Department of Civil Engineering,Beihang University;State Key Laboratory of Subtropical Building Science,South China University of Technology;

【机构】 北京航空航天大学土木工程系； 华南理工大学亚热带建筑科学国家重点实验室；

【摘要】 在疲劳荷载作用下,钢筋混凝土桥梁结构的疲劳损伤不断累积,剩余承载力随之劣化。本文基于已有的混凝土和钢筋材料疲劳损伤研究成果,提出了混凝土三段式疲劳损伤本构关系,和基于断裂力学的钢筋疲劳损伤本构关系,利用本项目组提出的钢筋混凝土压弯截面非线性分析模型及相关程序,对疲劳加载损伤后钢筋混凝土构件正截面进行全过程分析,得到的正截面剩余承载力与已有试验数据吻合较好,最后分析了不同疲劳荷载水平和循环次数对正截面剩余承载力的影响。更多还原

【Abstract】 Subjected to fatigue load, reinforced concrete bridge suffers from the accumulation of fatigue damage, which results in degradation of residual carrying capacity. Based on the existing research findings of material fatigue damage, fatigue damage constitutive relations of concrete in ternary form and reinforcing bar on the basis of fracture mechanics are proposed. Nonlinear analysis model and relative program of bending cross section of reinforced concrete suggested by this project team are used to analyze the whole loading process of RC normal section with fatigue damage. The analytical results of residual carrying capacity are in good agreement with test data. At last the degradation law of carrying capacity of bending section is derived under the consideration of the fatigue loading level and the number of cyclic loading.更多还原