摘要
由于铁路选线限制,部分铁路站房修建在高烈度区,且靠近地震断层。为保障铁路站房结构的抗震安全,以某站房结构为研究对象,分析考虑近断层强震影响的站房结构地震易损性。首先,分别采用近断层抗震设计谱和规范抗震设计谱对铁路站房结构进行抗震设计,建立相应的站房结构数值模型,并对模型进行验证;然后,选取24组近断层脉冲型地震动,分析铁路站房的地震响应,并分别定义站房结构中混凝土框架、钢屋架和砌体填充墙的损伤指标;最后,对2种设计谱设计的铁路站房局部及整体地震易损性进行评估。结果表明:在8度罕遇地震作用下,考虑近断层强震影响的站房结构相较于不考虑的,其混凝土框架和砌体填充墙出现毁坏的超越概率分别下降58.26%和19.82%,整体结构出现毁坏的超越概率上下界分别下降17.27%和19.83%;考虑近断层强震影响的抗震设计能够降低站房结构发生损伤的概率,提高其抗震性能;考虑近断层强震影响的站房结构损伤概率由大到小依次为砌体填充墙、混凝土框架、钢屋架。基于此,地震断层附近的铁路站房结构抗震设计应考虑近断层强震的影响,并加强砌体填充墙的抗震构造措施。
Some railway station houses are mostly built in high-intensity areas close to seismic fault due to the selection restrictions on railway routing.In order to ensure the seismic safety of them,the structure a station house was used as the research object,and the seismic fragility of the structure considering the influence of nearfault strong ground motions was analyzed.Firstly,the station house structure was designed based on the nearfault seismic and the standard seismic design spectrums respectively,and the numerical model of them was established.Then,24 sets of near-fault pulse-like ground motions were selected to analyze the seismic response of the station house structure;and the damage indices of the concrete frame,steel roof truss and masonry infill wall of the station house structure were defined respectively.Finally,the comparative analysis of seismic fragility between the partial and the entire railway station house structures designed by the two seismic design spectrums were evaluated.The result shows that under the action of the rare intensity level of degree 8,only when considering the near-fault strong ground motions,the exceeding probabilities of fragility of the concrete frame and the masonry infill wall were reduced by 58.26% and 19.82%;and the upper and lower bounds of the exceeding probabilities of fragility of the entire structure were reduced by 17.27% and 19.83% respectively.It shows that the seismic design considering the influence of near-fault strong ground motions can reduce the fragility probability of the station house structure and improve its seismic performance.The fragility probabilities of the station house structure considering the influence of near-fault strong ground motions,in descending order,are the masonry infill wall,the concrete frame and the steel roof truss.Therefore,it is suggested to consider the influence of near-fault strong ground motions in the seismic design of railway station house structures close to seismic fault and to reinforce measures of seismic structures of masonry infill walls.
作者
潘毅
宋佳雨
包韵雷
陈强
陈鹏
PAN Yi;SONG Jiayu;BAO Yunlei;CHEN Qiang;CHEN Peng(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Key Laboratory of Seismic Engineering of Sichuan Province,Southwest Jiaotong University,Chengdu Sichuan 610031,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu Sichuan 610031,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2023年第4期17-27,共11页
China Railway Science
基金
国家自然科学基金资助项目(52278534)
四川省自然科学基金资助项目(2022NSFSC0423)。
关键词
铁路站房
近断层强震
近断层抗震设计谱
地震易损性
损伤指标
Railway station house
Near-fault strong ground motions
Near-fault seismic design spectra
Seismic fragility
Damage index
