A Numerical Analysis Based Substitute Method for Shaking Table Test in Considering of the Soil-Structure Interaction

Abstract eng:
This paper proposes a numerical analysis based substitute method for conducting of the earthquake simulation test on shaking table for high-rise tower structure in considering of the soil-structure interaction, due to the limitation of the load--bearing capacity, the size of the shaking table and the difficulty in simulating both of the soil foundation and its’ boundary condition in experimental practice. An off-shore high-rise tower structure is taken as the example for developing of the proposed substitute method. Corresponding 3-D finite element analysis model (model A) with all parts of soil, foundation and the upper structure is developed to simulate the seismic behavior of the entire prototype tower structure in considering of the soil-structure interaction. For avoiding to introduce of the large volume soil in earthquake simulation test practice on shaking table, an equivalent numerical 3-D finite element model (model B) without soil part but with adjusted foundation structure and the same upper structure is developed to obtain the same seismic performance of the upper structure with model A. Series of numerical modal analyses, response spectrum analyses, earthquake time-history analyses are carried out for both of model A and model B. Tentatively Adjusting of both of the constrain condition and the structure of the foundation of model structure B is the key issue of obtaining the same seismic performance of model B with model A. Consequently, both of the expected advantages and possible errors of the proposed substitute method is analyzed in considering of the soil-structure interaction by using the earthquake simulation test on shaking table for high-rise tower structure.

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