萨莫拉大桥震害调查与分析  

Investigation and analysis of seismic damage of Zamora Bridge

作　　者：李庆收 Li Qing-shou(China Railway 14th Bureau Group Corporation Limited,Ji'nan 250101,China)

机构地区：[1]中铁十四局集团有限公司,山东济南250101

出　　处：《工程抗震与加固改造》2025年第2期88-95,共8页Earthquake Resistant Engineering and Retrofitting

摘　　要：由于地形原因和工程需要,山区桥梁和城市匝道桥经常会采用剪跨比小于2.5的低矮桥墩。多次震害调查表明,钢筋混凝土矮墩容易发生剪切破坏,采用隔震支座可有效减小桥墩的剪力响应。本文首先对2019年遭到地震破坏的萨莫拉大桥进行了震害调查和原因分析,发现盆式橡胶支座过大的残余位移和桥台支撑垫石剪切破坏是该桥的主要地震破坏形式;采用增量动力分析方法对该桥支座、桥墩弯曲破坏和桥墩剪切破坏等进行了地震易损性分析。结果表明,支座破坏的概率大于桥墩剪切破坏,桥墩剪切破坏的概率大于桥墩弯曲破坏。Due to terrain reasons and engineering needs,low piers with shear span ratios less than 2.5 are often used for bridges in mountainous areas and urban ramp bridges.Multiple earthquake damage investigations have shown that reinforced concrete short piers are prone to shear failure.The use of seismic isolation bearings can effectively reduce the shearing force of bridge piers under earthquake action.This article first conducted a seismic damage investigation and analysis on Zamora Bridge,which was damaged by an earthquake in 2019.It was found that the main seismic damage forms of the bridge were the excessive residual displacement of the basin type rubber bearings and the shear failure of the abutment support pad stones.The incremental dynamic analysis method was used to analyze the seismic vulnerability of the bridge bearings,pier bending failure,and pier shear failure.The results show that the probability of bearing failure is greater than that of pier shear failure,and the probability of pier shear failure is greater than that of pier bending failure.

关 键 词：低矮桥墩 震害调查 地震易损性分析 盆式橡胶支座 

分 类 号：TU391[建筑科学—结构工程] U291.6[交通运输工程—交通运输规划与管理]