摘要
研究目的:以10组典型特征周期的铁路减隔震桥梁为研究对象,采用支座位置处延性位移作为地震响应参数(EDP),研究近断层地震作用下减隔震铁路桥梁地震响应参数与多种地震动强度指标IM的相关性。研究结论:(1)速度型IM指标最为适用于表征近断层减隔震桥梁非线性位移需求;(2)当结构初始特征周期与地震波高频能量集中区域频率及速度脉冲周期相近时,将导致EDP对IM值变化敏感,减隔震桥梁结构设计时应注意避开结构周期敏感区域;(3)本研究成果可为近断层铁路桥梁的减隔震设计提供技术支撑。
Research purposes:Selecting ten groups of isolated railway bridges with typical period as the research object and the ductile displacement of the isolation as the engineering demand parameter(EDP),the correlation between seismic responses of isolated railway bridge subjected to near-fault ground motion and intensity measure index(IM) of ground motion has been evaluated.Research conclusions:(1) The velocity type of IM index is most suitable for characterization of near-fault isolated bridge nonlinear displacement demand.(2) When the initial period of structure is similar to frequency area contains the most of the high-frequency energy of seismic wave or the velocity pulse period will lead to EDP is insensitive to the change of IM value,when design an isolated bridge,the initial period should avoid the sensitive frequency area.(3) This research result can provide guidelines to seismic design for the railway bridges located on near-fault zone.
出处
《铁道工程学报》
EI
北大核心
2017年第10期60-65,共6页
Journal of Railway Engineering Society
基金
中铁二院科技开发计划"川藏铁路近断层地震对铁路桥梁的影响及对策研究"(13164190(13-15))
关键词
铁路桥梁
近断层地震
减隔震桥梁
地震强度指标
地震响应参数
railway bridge
near-fault earthquake
isolated bridge
intensity measure
engineering demand parameter
