Author(s)

T.D. Hien, R. Buczkowski & M. Taczala

Abstract

Two numerical formulations for spectral analysis of linear superstructures subject to deck-motion loadings are presented in the paper. The input nodal deck excitations can be expressed in terms of spectral accelerations or de- fined by spectral density functions of random accelerations. Finite element displacement-based equations of motion are decoupled by using the modal transformation from the Cartesian, generalised nodal displacements to a set of the normal coordinates. Time and maximum response of the system are estimated by using alternatively the root-mean-square technique or spectral density method. Computational implementations of the two approaches are compared and discussed. Numerical algorithms worked out can be incorpo- rated

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