Three-Dimension Dynamic Soil-Structure Interaction Analysis Using the Substructure Method in the Time Domain

Abstract eng:
Based on the wave propagation theory and the lumped-mass explicit finite element procedure with a local transmitting artificial boundary, the substructure method is formulated with step-by-step integration and central difference approach. Since the explicit finite element and step-by-step integration scheme is adopted, this presented method leads to the ability in computational feasibility and the applicability in engineering. In addition, the local transmitting artificial boundary results in the significant reduction in computational effort with little loss of accuracy. To illustrate the efficacy of the procedure, numerical examples are studied for a structure founded on a rigid foundation which is on the surface of semi-infinite soil medium. The soil-structural dynamic predictions under the assumption of rigid foundation on a uniform simi-infinite medium using this substructure method are in good agreement to the reference solutions by direct method. Another numerical example is studied for the influence by the big stiffness of soil medium on the dynamic characters of the soil-structure system. This prediction can also be in agreement the reference by the typical method. These predictions can display the applied feasibility in engineering.

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