配置HRBF500钢筋的高速铁路圆端形桥墩低周疲劳性能试验研究  

Test Study on the Low Cycle Fatigue Properties of Round Ended Piers Reinforced with HRBF500 Rebars for High Speed Railway

作　　者：李秉南[1,2] 戴航[1] 张继文[1] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]东南大学建筑设计研究院有限公司,江苏南京210096

出　　处：《中国铁道科学》2014年第2期26-31,共6页China Railway Science

基　　金：国家"八六三"计划项目(2008AA030704)

摘　　要：采用1∶7.5的比例尺制作3个配置HRBF500钢筋的圆端形桥墩试件,进行不同位移幅值下的等幅低周疲劳试验,研究主筋采用500MPa级细晶粒钢筋的高速铁路桥墩的低周疲劳性能。结果表明:在低周反复加载过程中,试件的低周疲劳破坏过程分为损伤迅速发育、相持和快速破坏3个阶段;随着循环加载次数的增加,试件的损伤不断累积,强度、刚度和耗能能力等同步发生退化;循环加载的位移幅值是影响试件低周疲劳寿命的主要因素,随着循环加载位移幅值的增大,试件累积损伤发展的速度加快,低周疲劳寿命大幅减小,单个循环的滞回耗能增大,但低周疲劳破坏时总的累积滞回耗能降低。Three round ended bridge pier specimens reinforced with HRBF500 rebars were made with a scale of 1 to 7.5,and symmetric low-cycle fatigue tests were conducted with these specimens under different displacement amplitude to study the low-cycle fatigue properties of the high-speed railway bridge piers reinforced with 500 MPa fine grained rebars.The results show that,in the process of low-cycle reversed loading,the low-cycle fatigue process of the specimens can be divided into three stages：rapid damage development stage,stalemate stage and quick failure stage.With the increase of cyclic loading times,the damage of the specimens accumulates constantly,while their strength,stiffness and energy dissipation degrade synchronously.The displacement amplitude of cyclic loading is the main factor affecting the low-cycle fatigue lives of the specimens.With the increase of displacement amplitude of cyclic loading,the cumulative damage of the specimens develops faster; the low-cycle fatigue life is reduced sharply; the hysteretic energy dissipation per cycle is increased,while the total cumulative hysteretic energy dissipation is decreased.

关 键 词：桥墩 高强钢筋 低周疲劳 累积损伤 抗震 高速铁路 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]