Analysis of the interaction on the high-rise building foundation raft the thickness

Owning to lack of research on properties of raft foundation,the appropriate designing principles and calculation methods are lacked in engineering field.Instead the traditional design methods that lack accuracy are used in designing raft foundation.It usually results in too thick raft,and makes the cost of foundation very high.On the base of the interactive principles of superstructure,base and soil,a computation method of raft foundation is brought foward in which many factors are considered.The method corresponds to real foundation working conditions.In this paper reasearch on the extensity frame-raft and soil the interaction on raft foundation by stress and distortion.Set up 3—dimensions finite element model of raft foundations by prossional software.By using above coupled non-linear numerical approach,the influence of concrete strength and thickness of raft foundation is analyzed and discussed.Through calculations for optimization of raft foundation.According to the conclusions,we can bring forward some further suggestion to building routine design tbrough the contrastive analysis,which can make the raft become thinner and the cost of foundation can decreases much more.