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A seismic free field input formulation of the coupling procedure of the finite element (FE) and the scaled boundary finite-element
(SBFE) is proposed to perform the unbounded soil-structure interaction analysis in time domain. Based on the substructure
technique, seismic excitation of the soil-structure system is represented by the free-field motion of an elastic half-space.
To reduce the computational effort, the acceleration unit-impulse response function of the unbounded soil is decomposed into
two functions; linear and residual. The latter converges to zero and can be truncated as required. With the prescribed tolerance
parameter, the balance between accuracy and efficiency of the procedure can be controlled. The validity of the model is verified
by the scattering analysis of a hemi-spherical canyon subjected to plane harmonic P, SV and SH wave incidence. Numerical results
show that the new procedure is very efficient for seismic problems within a normal range of frequency. The coupling procedure
presented herein can be applied to linear and nonlinear earthquake response analysis of practical structures which are built
on unbounded soil.
Supproted by: the National Key Basic Research and Development Program under Grant No. 2002CB412709 相似文献
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