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幅值相关阻尼在车桥耦合振动计算中的应用

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Keywords: 桥梁工程,车桥耦合振动,振型叠加法,幅值相关阻尼,位移幅值,加速度幅值

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Abstract:

开展了幅值相关阻尼比在车桥耦合振动中的应用研究。编制了车桥耦合振动计算程序,利用相关文献提出了振幅相关阻尼比和加速度幅值相关阻尼比的计算方法,结合一座简支箱梁桥,计算了实际桥梁位移幅值和加速度幅值相关阻尼比,并且对比了采用常阻尼比0.05和采用幅值相关阻尼比的车桥耦合振动响应。对比结果发现,采用幅值相关阻尼计算的响应结果小于采用常阻尼比0.05的响应计算结果,其中加速度相关阻尼比的计算结果和实测结果吻合度较高。幅值相关阻尼比是车桥耦合振动中阻尼比取值的一种很好方法,并且求解的结果有着较高的精度。

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