変動軸力を受ける杭基礎の極限水平耐力 : その1.一スパン建物の場合

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During earthquakes, pile foundation of a structure is subjected to overturning moment together with lateral force, besides normal axial load. Both forces, coupled with one another, vary according to time. Further, due to the overturning moment, pile in the overturning direction is subjected to compression force, whereas pile in the opposite direction is subjected to tensile force. Numerical analysis has been conducted on both steel pipe piles and cast-in-place concrete piles of 14-story structures (SRC). Axial load on piles is assumed to change lineally with the lateral force. Ultimate lateral resistance of i) piles subjected to either compression or tensile force, and ii) pile foundations situated span-wise is discussed. Following conclusions were derived ; i) In dependent of the pile material, piles subjected to compression or tensile force show different type of lateral behavior with one another when the pile is deformed beyond elasticity limit. Further, ultimate lateral resistance of steel pipe piles subjected to compression force is extremely small compared to those subjected to tensile force, whereas it is the contrary for cast-in-place concrete piles. ii) Ultimate lateral resistance of the pile foundation is determined by the ultimate resistance of the pile subjected to compression force for steel pipe piles, and for cast-in-place concrete piles, it is determined by that of the pile subjected to the compression force. Also, lateral load distribution factor (ratio of the lateral load supported by a pile individually to the total lateral force acting on the structure) of pile subjected to compression and tensile force differ with the increase of lateral force.
社団法人日本建築学会の論文
1989-10-30

変動軸力を受ける杭基礎の極限水平耐力 : その1.一スパン建物の場合

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