（上海大学土木工程系 200072）
［提要］ 针对一出现较大振动的人行天桥，利用有限元分析软件建立了计算模型并进行了动力特性分析，同时对结构进行了动力测试。实测数据与修正后的有限元模型分析结果吻合较好，利用分析结果对该天桥的振动水平做出判断，结果也比较吻合。在此基础上找到了引起结构振动的主要振动源，为结构后继的加固改造提供关
键信息。这一方法效果较好，可为今后类似工程提供参考。
［关键词］ 人行天桥 振动 动力测试 有限元分析 振动源
Dynamic Test and Finite Element Analysis on an Existing Footbridge/Fa Yongsheng,Li Dong(Civil Engineering Department, Shanghai University, Shanghai 200072, China)
Abstract:Finite element model is made with finite element analysis software and the dynam
ic characteristics of an existing footbridge are analyzed.A dynamic test is made. The test datum accords with the analysis results.The main vibration sources causing the vibration of the structure, which will provides key information for the strengthening,are found. This procedure can be a reference in similar engineering.
Keywords:footbridge; vibration; dynamic test; finite element analysis; vibration source