摘要
以怀邵衡铁路(90+180+90)m矮塔斜拉桥为工程依托,采用平均振型能量系数作为桥梁主导模态识别指标,在此基础上提出用于评估桥梁易损性的基于主导模态的地震动强度参数,并进行该参数的合理性分析。结果表明:基于主导模态的地震动强度参数充分考虑了地震动及结构自振特性,与桥梁地震损伤分析结构响应参数具有很强的相关性;针对高速铁路矮塔斜拉桥地震响应特性,斜拉索索力变化率相对其他需求参数敏感性较弱,较难量化结构地震功能损伤程度;与传统参数相比,基于主导模态的地震动强度参数在相关性、充分性及高效性上具有较强的优势,该参数可用于同类型桥梁地震功能易损性分析。
Taking the(90+180+90)m extradosed cable-stayed bridge on Huai-Shao-Heng Railway as a case study,the average modal energy coefficient was used as the identification index of bridge dominant modes.On this basis,the ground motion intensity parameter based on dominant modes was proposed for evaluating the fragility of bridge,and the rationality of this parameter was analyzed.The results show that the ground motion intensity parameter based on dominant modes fully considers the characteristics of ground motion and structural natural vibration,and it has a strong correlation with the structural response parameters of bridge seismic damage analysis.In view of the seismic response characteristics of high-speed railway extradosed cable-stayed bridge,the variation rate of stayed cable force is less sensitive than other demand parameters,so it is difficult to quantify the degree of stayed structural seismic function damage.Compared with traditional parameters,the ground motion intensity parameter based on dominant modes has strong advantages in correlation,sufficiency and efficiency.Therefore,this parameter can be used for the seismic function vulnerability analysis of the same type of bridges.
作者
谢明志
杨永清
黄胜前
洪彧
李晓斌
庄重
XIE Mingzhi;YANG Yongqing;HUANG Shengqian;HONG Yu;LI Xiaobin;ZHUANG Zhong(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Chengdu Construction Co.,Ltd.,Chengdu Sichuan 610000,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2021年第4期41-50,共10页
China Railway Science
基金
国家自然科学基金资助项目(51978589)
四川省科技计划资助项目(2020YJ0081,2021YJ0054,2019YJ0243)
中国国家铁路集团有限公司科技研究开发计划项目(P2019T001)
中央高校基本科研业务费科技创新项目(2682021CX011)。
关键词
主导模态
高速铁路
矮塔斜拉桥
大跨度
地震易损性
地震动强度参数
平均振型能量系数
Dominant modes
High-speed railway
Extradosed cable-stayed bridge
Long span
Seismic fragility
Ground motion intensity parameter
Average modal energy coefficient
