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(上海大學(xué)土木工程系，上海 200072)
［摘要］對(duì)一振動(dòng)較大的人行天橋進(jìn)行了動(dòng)力實(shí)測(cè)，利用有限元分析軟件SAP2000建立該結(jié)構(gòu)的有限元模型，利用基于實(shí)測(cè)數(shù)據(jù)的頻譜分析以及模態(tài)分析的方法對(duì)其出現(xiàn)的振動(dòng)問題進(jìn)行分析，確定結(jié)構(gòu)振動(dòng)水平，并為同類結(jié)構(gòu)的動(dòng)力特性研究提供參考。此外，還從通行行人和通行車輛這兩個(gè)因素對(duì)該天橋側(cè)向振動(dòng)過大的原因進(jìn)行了深入分析，從而找到了造成該天橋產(chǎn)生實(shí)測(cè)振動(dòng)特性的主要原因，對(duì)結(jié)構(gòu)出現(xiàn)過大側(cè)向振動(dòng)給出了合理解釋。
［關(guān)鍵詞］人行天橋；側(cè)向振動(dòng)；動(dòng)力測(cè)試；頻譜分析；模態(tài)分析
Dynamic testing and finite element analysis on a steel structural footbridge
Sun Daoyuan, Li Dong(Department of Civil Engineering, Shanghai University, Shanghai 200072, China)
Abstract:Dynamic testing of a footbridge which appears oversized vibration was carried on,  finite element model was established using finite element analysis software SAP2000 and studies on this footbridge’s vibration question were carried on using frequency spectrum analysis based on recorded data and modal analysis. It has determined the vibrating level and provided the reference for the similar structure’s dynamic performance research. In addition, the reason of this footbridge’s oversized vibration has been thoroughly analyzed from the pedestrian and
traffic. Then the main reason which causes the actual vibration characteristic has been found. Thus the reasonable explanation to the lateral oversized vibration was given.
Keywords:footbridge; lateral vibration; dynamic testing; frequency spectrum analysis; modal analysis
作者簡(jiǎn)介：孫道遠(yuǎn)，碩士研究生，Email:asdytj@163.com。
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