近断层地震作用下高速铁路大跨连续刚构桥易损性研究
Research on Vulnerability of Long-span Continuous Rigid-frame High Speed Railway Bridge Under Near-fault Earthquake
雷虎军 1朱广平 1陈奕涵 1陈希茂2
作者信息
- 1. 福建理工大学土木工程学院,福建福州 350118
- 2. 中铁二十四局集团福建铁路建设有限公司,福建福州 350013
- 折叠
摘要
为探究近断层地震作用下高速铁路大跨连续刚构桥的抗震性能,基于工程需求(EDP)符合对数高斯分布假设获取全桥损伤曲线,提出一种桥梁地震损伤危险性分级方法.在此基础上,考虑桥上无砟轨道的刚度效应,采用OpenSees有限元软件建立了某高速铁路大跨连续刚构桥的轨道-桥梁(线-桥)一体化非线性有限元模型;由80条近断层地震动实录波组成地震动数据库,采用基于概率需求的易损性分析方法详细分析了该高速铁路大跨连续刚构桥的抗震性能.结果表明:对于研究计算条件,近断层地震动速度峰值(PGV)与工程需求间的相关性较强;近断层地震作用下高速铁路连续刚构桥的边支座易出现轻微损伤,当遭遇中高强度(PGV＞100 cm/s)近断层地震动时桥梁关键截面的屈服概率较大,当PGV为200 cm/s时桥梁结构会受到严重破坏,而当PGV为300 cm/s时桥梁有极大可能发生完全破坏甚至出现倒塌.研究成果可为近断层区域高速铁路连续刚构桥的抗震设计提供参考.
Abstract
The paper presents a risk classification method for the seismic damage of bridge,based on the damage curve(s)of whole bridge obtained from the assumption of logarithmic Gaussian distribution of engineering requirements(EDP).The goal is to study the seismic performance of long-span continuous rigid-frame HSR bridge under near-fault earthquake.Given the stiffness of ballastless track on the bridge,the paper builds an integrated nonlinear finite element model of track-bridge for a long-span continuous rigid-frame HSR bridge on OpenSees platform.As 80 near-fault ground motion waves recorded constitute the ground motion database,the seismic performance of the bridge is analyzed via probability-demand-based vulnerability analysis.The results show a strong correlation between the near-fault peak ground velocity(PGV)and the EDP.Under near-fault earthquake,the side bearings of the bridge are prone to slight damage,while in case of medium-high intensity(PGV greater than 100 cm/s)near-fault ground motion,the yield probability of key sections of the bridge can be fairly significant.When PGV is 200 cm/s,the bridge structure is subject to serious damage,while it is very likely to be completely damaged or even collapsed at 300 cm/s.The results are of reference to the seismic design of continuous rigid-frame HSR bridges in near-fault areas.
关键词
高速铁路/连续刚构桥/近断层地震动/线-桥一体化模型/易损性分析Key words
HSR/continuous rigid-frame bridge/near-fault ground motion/integrated track-bridge model/vulnerability analysis引用本文复制引用
基金项目
国家自然科学基金项目(51878173)
福建省自然科学基金资助项目(2020J01883)
出版年
2024
NETL
NSTL
万方数据