桥梁结构在地震作用下的动力响应研究  

Study on Dynamic Response of Bridge Structure Under Earthquake

作　　者：王欣 Wang Xin(Gansu Broadcom Engineering Consulting Co.,LTD.,Lanzhou 730030,China)

机构地区：[1]甘肃博通工程咨询有限公司,兰州730030

出　　处：《黑龙江科学》2025年第8期52-56,共5页Heilongjiang Science

摘　　要：针对复杂桥梁结构在地震作用下的动力响应特性,采用时程分析法,对某大跨度钢结构桥梁进行数值模拟研究,通过有限元软件建立三维结构模型,选取1条人工合成地震波和2条天然地震波作为输入,分析结构在不同地震波作用下的振动特性。研究结果表明,支撑系统和端部连接梁是结构的关键构件,最大位移出现在悬臂梁端部。计算显示结构在X轴和Y轴两个方向的动力响应存在显著差异,但各项指标均满足规范要求,结构具有良好的抗震性能。Aiming at the dynamic response characteristics of a complex bridge structure under earthquake,the study numerically simulates a long-span steel structure bridge by using time-history analysis method,establishes a three-dimensional structure model by finite element software,selects one synthetic seismic wave and two natural seismic waves as inputs,and analyzes the vibration characteristics of the structure under different seismic waves.The results show that the support system and the end connecting beam are the key components of the structure,and the maximum displacement occurs at the end of the cantilever beam.The calculation shows that there are significant differences in the dynamic response of the structure in the X and Y axis.But all the indexes meet the specification requirements,and the structure has good seismic performance.

关 键 词：桥梁结构 有限元 时程分析 动力响应 地震波 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]