(上海大学土木工程系，上海 200072)
［摘要］对一振动较大的人行天桥进行了动力实测，利用有限元分析软件SAP2000建立该结构的有限元模型，利用基于实测数据的频谱分析以及模态分析的方法对其出现的振动问题进行分析，确定结构振动水平，并为同类结构的动力特性研究提供参考。此外，还从通行行人和通行车辆这两个因素对该天桥侧向振动过大的原因进行了深入分析，从而找到了造成该天桥产生实测振动特性的主要原因，对结构出现过大侧向振动给出了合理解释。
［关键词］人行天桥；侧向振动；动力测试；频谱分析；模态分析
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
作者简介：孙道远，硕士研究生，Email:asdytj@163.com。
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