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随着大型柔性桥梁建设的迅速发展 ,其长期安全运行的健康监测的评估得到很大关注。通过试验模态分析对验证设计、建立结构的动力学模型以及桥梁安全运行状态的评估具有重要意义。拱桥桥面主梁与拱结构耦合振动 ,其模态试验比斜拉桥更加困难。本文通过我国首座建成的云南小湾钢箱提篮拱桥模态试验和竣工试验 ,提出了一种节省试验成本的基于环境激励下桥梁模态试验方法 ,取得了拱桥整体振动的较为正确的模态频率、阻尼及较理想振型 ,与有限元计算基本吻合。
With the rapid development of large-scale flexible bridges, great attention has been paid to the assessment of health monitoring in long-term safe operation. Through the experimental modal analysis, it is of great significance to validate the design, establish the dynamic model of the structure and assess the safe operation status of the bridge. Arch bridge deck girder and arch structure coupled vibration, the modal test more difficult than the cable-stayed bridge. In this paper, based on the modal test and the completion test of the first completed steel box-girder arch bridge in Xiaowan, Yunnan, a modal test method based on environmental excitation is proposed to save the test cost and the correct modal frequency of the whole vibration of the arch bridge is obtained. , Damping and the more ideal mode shapes are basically consistent with the finite element calculation.