水平力を受けるパイルド・ラフト基礎の挙動解析

抄録

This paper describes simulation analyses of piled raft foundation under horizontal load. Two types of analytical model, 2D and 3D model, are used to calculate the horizontal resistance of piled raft foundations. 2D model is a simple model and consists of two dimensional beam elements of piles and Winkler's type of soil springs. 3D model is a hybrid type model combining three dimensional beam elements, an elastic half space and nonlinear joint elements inserted at raft/soil-pile interface. The simulation analyses are carried on three foundation types, the raft foundation, the pile foundation and the piled raft foundation, to estimate the horizontal behavior of piled raft foundations. From the comparison of analyses and in-situ loading tests, the following conclusions are obtained. The results of the simple 2D analysis are in good agreement with the experiment, where the spring constant in the analysis is evaluated from tests results. The simulation results by the 3D analysis explain well the horizontal behavior of not only the piled raft foundation, but also the raft foundation and the pile foundation.