摘要
为探讨近断层区域高速铁路桥上车-轨-桥系统的地震响应特征,以一拟建大跨度高速铁路桥梁为例,利用震源-传播途径-场地条件一体化的强地震动模拟方法,模拟桥址周围活断层引起的地震动场,并作为输入分析该车-轨-桥系统的动力响应,同时与该桥址处实测地震动输入下的动力响应作对比。结果表明:震源-传播途径-场地条件一体化的强地震动模拟方法能够模拟台站处的地震动幅值和波形特征,特别是在速度时程中体现长周期脉冲成分,体现近断层区域地震动的空间差异;相比于实测地震动,模拟地震动对系统各部件的位移差和加速度的影响更大。车体横向加速度对地震动输入更为敏感。
In order to investigate the seismic response characteristics of the vehicle-rail-bridge system of a high-speed railway bridge near-fault area,taking a proposed long-span high-speed railway bridge as an example,the strong ground motion field caused by active fault around the bridge site was simulated by using the method of integration of source,propagation path and site condition.The vehicle-track-bridge system's dynamic responses under the simulated ground motion were analyzed and compared with those under observed ground motion.The results show that:a strong ground motion simulation method,integrating source,propagation path and site condition,can simulate the amplitude and waveform characteristics of ground motion at the station.In particular,the long-period pulse component is reflected in the velocity time history,and the spatial difference of ground motion near-fault area is reflected.Compared with the observed ground motion,the simulated ground motion has a greater impact on the displacement difference and acceleration of each component of the system.The transverse acceleration of the vehicle body is more sensitive to the ground motion input.
作者
许乾奇
曹毅杰
孙晓丹
刘钰
王季陈
肖畅
XU Qianqi;CAO Yijie;SUN Xiaodan;LIU Yu;WANG Jichen;XIAO Chang(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;National Engineering Research Center of Geological Disaster Prevention Technology in Land Transportation,Chengdu Sichuan 610031,China;Key Laboratory of High-speed Railway Engineering of Ministry of Education,Chengdu Sichuan 610031,China;Standards and Certification Department,China Railway Society,Beijing 100844,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2022年第6期207-214,共8页
China Safety Science Journal
基金
国家重点研发计划(2018YFE0207100)
国家自然科学基金资助(51878578,U2039208,51708459)
中铁工程设计咨询集团有限公司科技开发课题(2021-10)
四川省科技计划项目(2020YJ0253,2020YFSY0060)。
关键词
高速铁路
地震动模拟
车辆-轨道-桥梁
近断层
空间差异
high-speed railway
ground motion simulation
vehicle-track-bridge
near-fault
spatial difference
