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    Torsional Earthquake Response of Suspension Bridges

    Source: Journal of Engineering Mechanics:;1984:;Volume ( 110 ):;issue: 010
    Author:
    Ahmed M. Abdel‐Ghaffar
    ,
    Lawrence I. Rubin
    DOI: 10.1061/(ASCE)0733-9399(1984)110:10(1467)
    Publisher: American Society of Civil Engineers
    Abstract: The earthquake‐induced torsional response of suspension bridges when subjected to multiple support excitations is analyzed in the frequency domain by means of random vibration theory. Appropriate rocking and torsional ground motion inputs are defined from finite Fourier transforms of recorded translational motions by using a simplified approach based upon wave propagation theory. An example is presented in which the torsional response of the Golden Gate Bridge to earthquake ground motions (the 1979 Imperial Valley earthquake) with characteristics significantly different at each support point is investigated. It is observed that the participation of higher modes in the total response is essential to assess the torsional seismic behavior of such structures. It is also observed that both the vibrational displacement and vibrational cable tension induced by torsional vibration are very small but the flexural stresses induced by the torsional vibration are relatively large as live loads.
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      Torsional Earthquake Response of Suspension Bridges

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    http://yetl.yabesh.ir/yetl1/handle/yetl/71708
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    contributor authorAhmed M. Abdel‐Ghaffar
    contributor authorLawrence I. Rubin
    date accessioned2017-05-08T22:07:08Z
    date available2017-05-08T22:07:08Z
    date copyrightOctober 1984
    date issued1984
    identifier other%28asce%290733-9399%281984%29110%3A10%281467%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/71708
    description abstractThe earthquake‐induced torsional response of suspension bridges when subjected to multiple support excitations is analyzed in the frequency domain by means of random vibration theory. Appropriate rocking and torsional ground motion inputs are defined from finite Fourier transforms of recorded translational motions by using a simplified approach based upon wave propagation theory. An example is presented in which the torsional response of the Golden Gate Bridge to earthquake ground motions (the 1979 Imperial Valley earthquake) with characteristics significantly different at each support point is investigated. It is observed that the participation of higher modes in the total response is essential to assess the torsional seismic behavior of such structures. It is also observed that both the vibrational displacement and vibrational cable tension induced by torsional vibration are very small but the flexural stresses induced by the torsional vibration are relatively large as live loads.
    publisherAmerican Society of Civil Engineers
    titleTorsional Earthquake Response of Suspension Bridges
    typeJournal Paper
    journal volume110
    journal issue10
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)0733-9399(1984)110:10(1467)
    treeJournal of Engineering Mechanics:;1984:;Volume ( 110 ):;issue: 010
    contenttypeFulltext
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