大跨度拼装式钢桥桥跨推送过程典型工况动力学特性研究
Dynamics Properties Study on the Typical Condition of the Large Span Assembly Type Steel Bridge during Bridge Span Pushing Process

DOI: 10.12677/HJCE.2019.89153, PP. 1323-1329

Keywords: 桥跨推送过程，模态试验，有限元分析，动力学模型
Bridge Span Pushing Process, Modal Test, Finite Element Analysis, Dynamics Model

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Abstract:

采用环境激励法进行了大跨度拼装式钢桥桥跨推送过程典型工况结构的模态测试，得到了自振频率、振型和阻尼比等振动参数，将模态试验结果与有限元计算结果进行对比分析，结果表明计算结果与实测结果基本吻合，验证了有限元模型的正确性。利用有限元模型进行了结构谐响应分析，根据结构整体竖向动力特性相等的原则，提出了桥跨推送过程典型工况的简化动力学模型。
Natural frequencies, vibration modes and damping ratios of the typical condition of the large span assembly type steel bridge during bridge span pushing process are derived from modal tests by using the ambient excitation method. The dynamic test results are compared with the finite element calculation results. It is determined that the calculated results are in accordance with the experimental results, which verifies the correctness of the finite element model. Then, harmonic response analyses are addressed by employing the finite element model. The simplified dynamics model is proposed based on the equal principle of the overall vertical dynamic characteristics of the structure.

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