杭の塑性化に着目した遠心載荷実験のシミュレーションに基づいた大地震時の杭頭損傷評価

抄録

Nonlinear soil-structure interaction effects under strong ground motions should be considered in the seismic design of pile foundation. In order to investigate influence of nonlinear soil-structure interaction, the centrifugal shaking table tests considering the plastic behavior of pile cap are conducted. This paper presents the damage evaluation method of pile cap based on the simulation analysis of the centrifugal shaking table tests, in which the effects of local nonlinearity of pile-soil system on the seismic behavior of pile structures are clarified. The major findings obtained from this study are summarized as follows; 1) The test results are precisely simulated by the 3-dimensional finite element analysis, 2) the slip and separation behavior between the pile and the soil do not affects the seismic behavior of pile structures very much, so the test results are simulated by winklerian model analysis, 3) the plasticity of pile cap emphasizes the influence of the ground displacement subjected to pile on ductility ratio at pile.