Abstract
Pile stresses during an earthquake comprise stresses due to mertial force of the structure and due to soil response. This paper presents the practical evaluation method for the latter stresses σ_K, and it describes the analysis method of the soil response when the maximum acceleration of the earthquake input motion at the soil surface is given and the applicability examination of the method. The first natural period and the first modal damping factor of the soil deposit are employed for the estimation of the response of the soil, and the nonlineanties of the strata are incorporated. The extension of siuk nonlinearities by the proposed method gives good agreement with that by the more rigorous procedure such as SHAKE The proposed pile stress analysis method is based on the transfer matrix method. Five kinds of soil conditions are set, and the correlative studies are done comparing with the rigorous method. When the soil contains the weak stratum, the stresses by the proposed method show the slightly poor agreement. Judging from the practical seismic design, the proposed method has the enough applicability.
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