Abstract
This paper describes effects of strong nonlinear interaction between soil and piles or improved soil on seismic response of a building supported by piles. Shaking table tests by large earthquake inputs were conducted using structure model supported by piles in dry sand. 3D-nonlinear analyses were also conducted to investigate the effects of strong nonlinearity of ground around piles or improved soil. It is obtained that strong nonlinearity of ground around piles or improved soil affects the response of superstructure and pile stress. Especially, the strong nonlinear behavior of ground around improved soil changes the response of superstructure and the lateral resistance of piles.
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