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介绍了联合应用峰值法和互谱法的模态参数识别方法,并提出了一种新的主梁振型优化方法.将上述方法应用于润扬大桥悬索桥的运行模态识别系统中,利用结构健康监测系统采集的振动响应数据获取结构的模态参数.作为应用实例,对台风麦莎作用下的主梁、主缆和桥塔振动响应数据进行了模态参数识别.结果表明:主梁部分振型的模态频率不仅能从主梁的振动响应识别出来,而且能够从主缆和桥塔振动响应中识别,主梁、主缆和桥塔之间存在较强的耦合振动.此外,将运行模态的识别结果和成桥之初的现场测试结果进行了对比,二者识别结果整体上吻合较好,但运行模态系统识别的部分振型模态频率,如L1和L2,发生了较明显的下降.
This paper introduces the modal parameter identification method of joint application of peak method and cross spectrum method and proposes a new optimization method of the main girder vibration mode.The above method is applied to the operation modal identification system of Runyang Bridge Suspension Bridge, And the vibration response data collected by the health monitoring system to obtain the modal parameters of the structure.As an application example, the modal parameters of the vibration data of the main girder, main cable and pylon under typhoon Matsa are identified.The results show that: The modal frequencies of mode shapes can not only be identified from the vibration response of the main girder, but also can be identified from the vibration responses of the main cable and pylon, and there is strong coupling vibration between main girder, main cable and pylon. In addition, The recognition results of operational modes are compared with the field test results at the beginning of the bridge. The overall recognition results of the two models are in good agreement with each other. However, some modal modal frequencies identified by operational modal systems, such as L1 and L2, More obvious decline.