An efficient method to compute the seismic response of an offshore platform in still water is presented. The structure is modelled by a three-dimensional space frame with lumped parameters and the dynamic response is determined by the mode-superposition method. Both the effects of the nonlinear drag force and the mode-damping coupling are also taken into account. The random nonlinear drag force is linearized by the method of the least square in statistical sense, and the mode-damping coupling is uncoupled by use of the concept of the generalized complex damping. As a consequence some important spectral bandwidths for all vibrational modes can be derived simply in terms of the generalized complex damping ratios and fhe generalized coordinates at resonances.


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    Title :

    Generalized complex damping and spectral bandwidths for seismic responses of offshore platforms


    Contributors:

    Published in:

    Publication date :

    1987-01-01


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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