基于钢筋低周疲劳的桥墩地震易损性分析  

Seismic Fragility Analysis of Bridge Piers Based on Low-cycle Fatigue Life of Reinfrocing Steel

作　　者：苏俊省[1] 王君杰[1] 郭进[2] 彭运动[3] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]石家庄铁道大学土木工程学院,河北石家庄050043 [3]中交公路规划设计院有限公司,北京100088

出　　处：《同济大学学报（自然科学版）》2016年第1期29-36,共8页Journal of Tongji University:Natural Science

基　　金：贵州省"十二五"重大科技专项([2011]6014);国家"九七三"重点基础研究发展计划(2013CB036305);国家自然科学基金(51278373;51438010;51508351)

摘　　要：基于Coffin-Manson钢筋疲劳损伤模型,采用非线性纤维梁柱单元,对纵筋采用HRB335和HRB500E的圆柱形桥墩拟静力试验进行数值模拟,研究拟静力作用下低周疲劳对钢筋和构件承载力退化的影响.为了进一步研究钢筋低周疲劳对试件累积损伤的影响,将Takemura和Kunnath提出的两组不同加载模式下的拟静力试验进行数值模拟.结果表明:基于Coffin-Manson模型,采用纤维单元,在材料层面上考虑钢筋的低周疲劳,可以较好地模拟试件在不同加载模式下的累积损伤和承载力退化.A nonlinear fiber beam-column element was used to simulate quasi-static tests of circular concrete bridge piers reinforced with HRB335 and HRB500E longitudinal bars based on Coffin-Manson low-cycle fatigue damage model for reinforcing steel. The effects of low-cycle fatigue damage on the strength degradation of reinforcing steel and reinforced concrete specimens were studied. In order to further verify the effect of low-cycle fatigue of reinforcing steel on the cumulative damage of reinforced concrete specimens, two quasi-static tests proposed by Takemura and Kunnath with different loading modes were conducted. The results indicate that, the fiber beam-column element could simulate the cumulative damage and strength degradation of reinforced concrete columns under different loading modes when considering the low-cycle fatigue of reinforcing steel on material level by using Coffin-Manson model.

关 键 词：钢筋混凝土 桥墩 低周疲劳 累积损伤 承载力退化 纤维单元 

分 类 号：TU375.3[建筑科学—结构工程]