大震铁路桥涵震害损失评估方法  

Seismic hazard loss evaluation of railway bridge in large earthquake

作　　者：周长东[1] 白倩楠[1] 高日[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《北京交通大学学报》2013年第1期85-89,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家地震局地震行业科研专项基金资助(201008005);国家自然科学基金资助项目(50978021)

摘　　要：调查统计并分析了唐山地震和汶川地震中铁路桥梁的震害情况,提出了适用于震后铁路桥梁震害的应急评估方法;基于铁路桥梁的地震易损性评价,选取了典型的震害影响因素;采用最小二乘法,建立了用于计算混凝土铁路梁式桥震害指数的统计回归模型;提出了评价地震破坏等级的经验公式、经验系数及评判指数,并对铁路桥梁的震害损失比进行了专门研究;结合工程实例,给出了震后铁路桥梁震害损失评价的过程和步骤.Based on the investigation,statistics and analysis of railway bridge seismic damages caused by Tangshan and Wenchuan earthquakes,an emergency assessment method of railway bridge damages was proposed.Based on railway bridge seismic vulnerability assessment,the typical earthquake damage influencing factors were determined.By the least squares method,a statistical regression model used to calculate the damage index of concrete railway beam-bridge was established.The empirical formula,empirical coefficient and evaluation index for earthquake damage were proposed.A special study on earthquake damage loss ratio of railway bridges was conducted.With an example,the detailed processes and procedures of the earthquake damage assessment for railway bridges were introduced.

关 键 词：铁路桥梁 震害评估 地震易损性 统计回归模型 损失比 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]