基于概率地震需求的铁路隔震桥梁易损性对比

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• 英文论文题名：Comparisons of Seismic Vulnerability for Isolated and Nonisolated Railway Bridges Based on Probabilistic Seismic Demand Models
• 论文作者：杨国静 ; 游励晖 ; 曾永平
• 英文论文作者：Yang Guojing ; You Lihui ; Zeng Yongping ; China Railway Eryuan Engineering Group Co. ; Ltd.
• 年：2016
• 作者机构：中铁二院工程集团有限责任公司;
• 论文关键词：铁路简支梁 ; 易损性 ; 球型钢支座 ; 双曲面球型减隔震支座 ; 概率地震需求 ; 位移延性比
• 英文论文关键词：simply-supported bridge ; seismic vulnerability ; steel spherical bearings ; double spherical aseismic bearings ; probabilistic seismic demand model ; displacement ductility ratio
• 会议召开时间：2016-10-14
• 会议录名称：“川藏铁路建设的挑战与对策”2016学术交流会论文集
• 语种：中文
• 分类号：U442.55
• 学会代码：ZGTD
• 会议名称：“川藏铁路建设的挑战与对策”2016学术交流会
• 会议地点：中国四川成都
• 主办单位：中国铁道学会、中国铁道学会工程分会、中国中铁股份有限公司、中铁二院工程集团有限责任公司
• 学会名称：中国铁道学会
• 页数：9
• 文件大小：733k
• 原文格式：O
• 会议级别：全国

摘要

近年来,我国铁路建设迅速发展,一些减隔震支座已逐渐应用在铁路高墩简支梁桥中,但目前采用减隔震支座的铁路桥梁还未得到强震的充分检验,理论研究也不充分。本文结合在建的川藏铁路,以采用两种支座类型的32 m简支梁桥为对象,在考虑桥梁结构及地震动参数随机性的基础上,利用传统可靠度概率分析方法建立了各自的地震易损性曲线,比较分析了减隔震桥梁与未减隔震桥梁在不同破坏状态下的超越概率,探讨了减隔震效果随墩高的变化规律,为铁路桥梁的抗震设计提供了参考和依据。研究表明:①与球型钢支座相比,双曲面球型减隔震支座有效地降低了不同墩高简支梁桥桥墩构件在轻微破坏、中等破坏以及严重破坏状态下的破坏概率,但对完全破坏状态下的破坏概率降低得并不是十分明显。②双曲面球型减隔震支座可显著提高矮墩简支梁桥的耐损性,对高墩则有限。
With the rapid development of China's railway construction in recent year,a number of isolation bearing has been gradually applied in high-pier simply-supported railway bridge.However,the railway bridge with isolation bearing used has not been fully tested under the earthquake and theoretical study is not sufficient.In this paper,based on 32 m simply-supported bridge of Sichuan-Tibet Railway with two types of bearings used,considering the randomness of bridge structure and ground motion parameters,their own seismic fragility curves are established by using traditional probabilistic reliability analysis methods.The exceeding probability under different damage states of isolated and non-isolated bridges is compared and the change law of reducing isolation effect with pier height is discussed which provides a reference for seismic design of railway bridge.The result shows that ①compared with steel spherical bearings,double spherical aseismic bearing can effectively reduce the failure probability of the pier with different height under minor-damage state,moderate-damage state and serious-damage state,but reduction under completely-destroyed state is not very clear.②The improvement in the fragility by using double spherical aseismic bearings is excellent for a short-pier bridge,but very limited for a high-pier one.

引文

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