摘要
针对某大跨度钢结构人行天桥出现的振动问题,对该人行天桥进行了全桥动力测试,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,为同类结构的动力特性研究提供参考。此外,改变了以往在此类问题中仅考虑行人对振动产生影响的局限性,分别从通行行人及通行车辆这两个因素对该天桥振动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,并对结构出现过大侧向振动给出了合理解释。相关信息可为后继结构的加固改造工作提供参考,并进一步提出了结构改造措施与建议。
In this paper, a large span footbridge carried on the dynamic testing appears oversized vibration, established the finite dement model using finite dement analysis software SAP2000 and carried on analysis and studies to this footbridge＇s vibration question using frequency spectrum analysis based on recorded data and modal analysis. Provided the reference for the similar structure＇s dynamic performance research. In addition, this paper changes the limitation of only considering the influence of passers-by, but analysis many possible factors such as vehicle and crosswind. Then based on this has found the main reason which causes the actual vibration characteristic. Thus give the reasonable explanation to the lateral oversized vibration. Provide the key information for the successor structure＇s reinforcement and transformation, and the structural improvement measures and suggestions are put forward too.
出处
《四川建筑科学研究》
北大核心
2009年第3期152-155,共4页
Sichuan Building Science
关键词
人行天桥
侧向振动
动力测试
频谱分析
模态分析
footbridge
lateral vibration
dynamic testing
frequency spectrum analysis
modal analysis
