外力および地盤の強制変位を受けるパイルド・ラフト基礎の三次元簡易変形解析

取得学位：博士(工学)，学位授与番号：博甲第655号，学位授与年月日：平成16年3月25日,学位授与年：200

Influence of reaction piles on the behaviour of test pile in static load testing

第3回 金沢大学22世紀COEシンポジウム「環日本海域の環境計測と長期・短期変動予測」,環日本海環境戦略機構会議,国際ワークショップ「環日本海域の大気環境計測:ネットワーク形成に向けて」, COE若手研究助成金等研究成果発表会:論文要旨

Comparative analysis of pile foundations in an elastic ground subjected to sinusoidal input accelerations

Analyses of a single pile, a pile group and a piled raft in a homogenous elastic ground subjected to earthquake are carried out using FEM and a simplified analysis method, In the FEM analyses, the raft and the piles are modelled by solid elements, or the raft is modelled by the thin plate elements and the piles are modelled by beam elements. As a simplified analysis method, a three-dimensional dynamic analysis of piled raft foundations subjected to earthquake using a hybrid model is proposed in this paper. In the analysis, the flexible raft and the pile are modelled as thin plates and beam elements, respectively. The soil is treated as springs and dashpots. The results from different modelling are compared, in order to investigate adequate modelling of raft, pile and ground and to investigate dynamic responses of the pile foundations. It is shown from the analyses that horizontal displacements and horizontal accelerations are not influenced by methods of modelling. In contrast, vertical responses such as vertical displacements hence the rocking motion of the pile, axial forces of the pile are influenced by methods of modelling, although the vertical responses are much smaller than the horizontal responses. Details of the results of the analyses are presented, and suggestions for the improvement of the simplified analysis method are discussed