摘要
为确定高铁连续梁桥的地震动最不利输入方向,基于OpenSees软件建立了某典型三跨高铁连续梁桥的非线性动力分析模型,以相对位移延性比为桥墩的损伤指标,分析了中墩和边墩在不同截面方向处各破坏状态的相对位移延性比界限值.然后,建立了不同地震动输入方向下固定中墩和边墩在不同截面方向处的易损性曲线.最后,以易损性函数中位值为指标,确定了各地震动输入方向对应的最不利截面方向,并通过对比不同地震动输入方向在其最不利截面方向处的易损性函数中位值来确定地震动最不利输入方向.结果表明,同一地震动输入方向下各桥墩最不利截面方向的差值均在20°以内;边墩所有破坏状态最不利地震动输入方向与其相应的最不利截面方向均为90°,固定中墩各破坏状态对应的最不利地震动输入方向不一致.地震动输入方向在0°~50°范围内,固定中墩发生破坏的概率更大;地震动输入方向在60°~90°范围内,边墩发生破坏的概率更大.
To determine the critical directions of earthquake input of high-speed railway continuous girder bridges, the nonlinear dynamic analysis model of a typical three-span high-speed railway continuous girder bridge was established based on OpenSees. Taking the relative displacement ductility ratio (RDDR) as the damage index of the piers, the limit values of RDDR of the middle piers and the side piers at different damage states (DSs) in different section directions were analyzed. Then, the fragility curves of the piers with respect to section directions under different directions of earthquake input were obtained. Finally, the median value of the fragility function was selected as the index to determine the critical directions of the earthquake input and the corresponding section directions. The critical directions of the earthquake input can be determined by comparing the median value of the fragility function in the critical section directions at different directions of the earthquake input. The results show that the phase difference of the critical section directions of each pier under the same directions of the earthquake input is less than 20°. The critical directions of the earthquake input and the corresponding section directions for all DSs of the side piers are 90°, and the critical directions of the earthquake input for each DS of the fixed middle pier are different. When the direction of the earthquake input is in the range of 0° to 50°, the probability of damage at all levels of the side piers is higher;however, when the direction is in the range of 60° to 90°, that of the side piers is higher.
作者
沈惠军
王浩
郑文智
梁瑞军
沙奔
Shen Huijun;Wang Hao;Zheng Wenzhi;Liang Ruijun;Sha Ben(Key Laboratory of Concrete and Prestressed Concrete of Ministry of Education, Southeast University, Nanjing 210096, China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第5期926-932,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51578151)
国家“万人计划”青年拔尖人才资助项目(W03070080)
江苏省重点研发计划资助项目(BE2018120)
江苏省研究生科研与实践创新计划资助项目(KYCX18_0117)
关键词
高铁桥梁
易损性分析方法
地震动输入方向
破坏状态
相对位移延性比
high-speed railway bridge
fragility analysis method
direction of earthquake input
damage state
relative displacement ductility ratio
