半穿式铁路应急钢梁抗震性能分析与评估  

Seismic Performance Analysis and Evaluation of Half-through Railway Emergency Steel Girder

作　　者：张晨曦 王新敏[2] 赵曼 李义强[2] 范鑫 ZHANG Chenxi;WANG Xinmin;ZHAO Man;LI Yiqiang;FAN Xin(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Safety Engineering and Emergency Management,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Traffic and Transportation,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学安全工程与应急管理学院,河北石家庄050043 [3]石家庄铁道大学交通运输学院,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2024年第3期12-17,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：河北省高等学校科学技术研究项目(CXY2023003)。

摘　　要：为评估铁路应急钢梁在多维地震作用下的抗震性能,以一座56m半穿式铁路应急钢梁为研究对象,借助ANSYS有限元软件,以材料应变和支座位移为损伤指标,确定各个损伤状态对应的指标限值.通过增量动力分析,采用10组地震动作为三向地震动输入样本,进行非线性时程分析,对应急钢梁各构件和结构整体进行易损性评估.研究结果表明,半穿式铁路应急钢梁横向刚度低于竖向刚度;结构在强震作用下,支座为最易损伤构件;结构整体出现严重损伤概率较低.To evaluate the seismic performance of railway emergency steel girder under multi-dimen-sional seismic action,a 56 m-span half-through railway emergency steel girder was studied.The materi al strain and support displacement were used as damage indexes by ANSYS finite element software to determine the index limits corresponding to each damage state.Through incremental dynamic analysis.10 groups of seismic actions were used as three dimensional seismic input samples for the nonlinear dy namic time-history analysis.The vulnerability of each component and the whole structure of the emer.gency steel girder was evaluated,The results show that the transverse stiffness of half-through railway emergency steel girder is lower than the vertical stiffness,The bearing is the most vulnerable component under the strong earthquake.The probability of serious damage to the whole structure is low.

关 键 词：铁路桥 半穿式钢梁 增量动力分析 地震易损性 抗震性能 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]