Simplified Method and Influence Factors of Vibration Characteristics of Isolated Curved Girder Bridge

Tongfa Deng; Junping Zhang; Mahmoud Bayat

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Simplified Method and Influence Factors of Vibration Characteristics of Isolated Curved Girder Bridge

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The isolated curved girder bridge''s vibration characteristics play a major part in the seismic responses of structures and anti-seismic properties.A clear analytic relationship between design parameters and the system''s vibration characteristics could be established by its simplified dynamic analysis model,making it convenient for providing a reference to the optimization of design and safety analysis.A double-mass six-degree-of-freedom model for curved girder bridges with isolation bearings installed at the top of the bridge piers is built and a simplified analysis method for the vibration characteristics of the system is provided.Combined with the Matlab programming,the influences of radius of curvature,central angle,bridge deck width and damping ratio of the isolation layer and circular frequency of the isolation layer of isolated curved girder bridges on the pseudo-undamped natural circular frequency(called pseudo-frequency for short)and system damping ratio are systematically analyzed,and the sensitivity of vibration characteristics of isolated curved girder bridges is studied.The results show that the vibration characteristics of isolated curved girder bridges can be reflected well with this simplified model and calculation method.The pseudo-frequency of curved girder and system damping ratios increases with the increase of the isolation layer.The third-order vibration characteristic is more sensitive to the parameters of a curved girder,and the first-order vibration characteristic is sensitive to both central angle and radius of curvature to some extent while insensitive to the width of the bridge deck.Furthermore,the second-order vibration characteristic is not sensitive to the parameters of a curved girder.

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来源
《结构耐久性与健康监测（英文）》 |2018年第3期|P.189-212|共24页
作者
Tongfa Deng; Junping Zhang; Mahmoud Bayat;
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作者单位

Guangzhou University-Tamkang University Joint Research Center for Engineering Structure Disaster Preventioand Control Guangzhou University Guangzhou 510006 ChinaJiangxi Provincial Key Laboratory of Environmental Geotechnical Engineering and Disaster Control Jiangxi University of Science and Technology Ganzhou Jiangxi 341000 China;

Guangzhou University-Tamkang University Joint Research Center for Engineering Structure Disaster Preventioand Control Guangzhou University Guangzhou 510006 ChinaGuangdong Communication Polytechnic Guangzhou 510170 China;

Young Researchers and Elite Club Roudehen Branch Islamic Azad University Roudehen Iran;

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原文格式 PDF
正文语种 chi
中图分类桥涵工程;
关键词
Seismic isolation; curved girder bridge; vibration characteristics; sensitivity analysis; simplified analysis method;

机译：地震隔离;弯曲梁桥;振动特性;灵敏度分析;简化分析方法;

Simplified Method and Influence Factors of Vibration Characteristics of Isolated Curved Girder Bridge

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