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（上海大學(xué)土木工程系，上海 200072）

［摘要］介紹了對一座鋼結(jié)構(gòu)人行橋進(jìn)行的全橋動力測試，并對結(jié)構(gòu)的動力特性進(jìn)行了分析。利用有限元計(jì)算軟件進(jìn)行了結(jié)構(gòu)模態(tài)分析，通過參數(shù)分析找到了各參數(shù)與結(jié)構(gòu)振動頻率之間的關(guān)系?；谶@一關(guān)系以及實(shí)際動力測試結(jié)果，通過對有限元模型參數(shù)進(jìn)行一系列修正，建立起可用于該結(jié)構(gòu)加固改造前后狀態(tài)評估的基準(zhǔn)有限元模型。該方法以及參數(shù)分析后得到的相關(guān)結(jié)論可為類似結(jié)構(gòu)的設(shè)計(jì)與加固改造提供借鑒。

［關(guān)鍵詞］人行橋；動力特性；動力測試；模態(tài)分析

Analysis on dynamic characteristics of an existing steel footbridge

Li Dong，F(xiàn)a Yongsheng

(Civil Engineering Department, Shanghai University, Shanghai 200072, China)

Abstract:The dynamic testing on an existing steel structure footbridge is introduced, and the dynamic characteristics are analyzed. Then modal analysis is performed by using finite element method. In this way, the relations between parameters and structural vibration frequency are figured out by parameter analysis. The FE model is calibrated based on the results of dynamic testing and parameter analysis, furthermore, the baseline FE model is constructed. This calibrated FE model can be used in the conduction evaluation before and after the structural strengthening. This method and the conclusion from the parameter analysis will be reference to similar problems.

Keywords:footbridge; dynamic characteristics; dynamic testing; modal analysis