建築構造物の施工進展を考慮した沈下過程解析 : 軟弱地盤のおける建築構造物の即時沈下および圧密沈下の三次元有限要素法解析その2

抄録

This paper is the second report in a series of studies on the settlement process of frame structures on poor grounds. A three-dimensional finite element method to analyze the structure-foundation-soils interaction has already been described in the previous paper. In this paper, we have proved that a large amount of differential settlements are caused by the shear settlements that occur in soils during construction of buildings. Based on this results, we have presented an analytical model to represent approximately the progress of construction of R. C. frame structures. And further, we have analyzed the settlement process of structures during and subsequent to construction by the finite element method using this model. The factors involved are plan of structures (square type and rectangular type), sort of foundation (raft and friction piles), horizontal extent and depth of poor grounds. The principal results are summarized as follows : 1) The relative deflections experienced by structural members vary with location and level in the building. 2) Although the modes of differential settlements of structures founded on the friction piles are similar to those founded on the raft, the magnitudes of the former are less than those of the latter. 3) The horizontal extent of poor grounds does not influence the differential settlements of structures as much as the depth of its does.