境界要素法による複数剛基礎の動的応答解析

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This paper describes the formulations on the three-dimensional elastodynamic problems by using the time domain BEM and its numerical performances. Under the integral representation of the general 3-D elastodynamic problems introduced by Wheeler and Sternberg et al., models of double rigid surface foundations are discretized into time and space by BEM, and dynamic responses of foundations are calculated. These formulations are employed with the fundamental solution corresponding to the complete space, and therefore require discretization of the entire boundary of the region. The time variation of the external dynamic forces is approximated by a sequence of rectangular impulses, and the tractions are assumed to be constant over each element and for each time step. The response of the foundations is obtained by superposition of the response due to the individual impulses. Two examples are analyzed under relaxed boundary conditions and compared with the results in frequency domain.
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