杭頭接合条件の異なる杭基礎建物の耐震性能に関する解析的研究

概要

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We study on the seismic performance of pile-supported 9-story RC buildings with different types of pile cap condition. We carry out earthquake responce analyses of the building supported by cast-in-place reinforced concrete piles and of the same building supported by steel pipe piles. Pile cap conditions of their pile foundations are assumed to be pin joints or rigid joints. The soil surrounding these foundations is supposed to have the same properties. The mass-spring models are used for their analyses. It is found that the maximum bending moment of piles with pin joints is smaller than that with rigid joints, and that, in case of the steel pipe piles, most part of the maximum bending moment is induced by the inertial force of the superstructure. Pile cap condition give less effects on the seismic performance of the superstructures. Furthermore, to compare the ultimate strength and the deformation capacity of the pile foundation with rigid joints to those of the pile foundation with pin joints, nonlinear static analyses are applied to the same building supported by the cast-in-place reinforced concrete piles. Frame models are used for the analyses. It is concluded that the foundation with pin joints has the larger deformation capacity and the smaller ultimate strength than that with rigid joints.
2002-04-30