In this study, a numerical analysis is performed to determine the foundation input motion during an earthquake for new pile foundations in the case where old piles have been left underground. The analysis is carried out with the aim of revealing the influences of the diameter, number, layout and depth of pile head of the unused old piles on the foundation input motion. The results indicate that when the diameter of the existing piles is large, and the new pile foundation is constructed in close proximity to them, the foundation input motion is larger than in the case where there are no existing piles by frequency. Furthermore, when the existing piles have a non-uniform layout, twisting of the new foundation can occur.
数値解析による既存杭の残置条件が新設杭基礎の基礎入力動に及ぼす影響の検討
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