The Interaction Analysis Of The Upper Structure-Raft-Soil Foundation

The interaction analysis of the space frame-raft-soil foundation is one method of all design, whose theoretic research and practical application just start on .The article is emphasized on researching the characters of the structural internal force and displacement considering the interaction of space frame-raft-soil foundation under horizontal and vertical loads. Some conclusions of interaction are derived from the research.The main researches are outlined as following:(1) In this article, the 3D static program is programmed which is applied to the interaction analysis of the superstructure-raft-soil foundation. The program can finish the interaction analysis of the structure not only under the condition of vertical loads but also horizontal loads.(2)In this article, the 3D static program is used to calculate the settlement, reactive force and internal force in structural for different thickness-raft, loads, floors, span and different soils, getting intuitional data. The single way on how to choose the thickness and overhang- length of the raft is obtained. The conclusions getting through a large number of cases are expected to be of referential use to engineering design.(3)For some structure, computation are conducted both by co-interaction method and conventional method to show the effects of the two method on the displacement and internal force of the upper structure, some beneficial conclusion are got throughcomparison of the two method.(4) In this article a rectangular element of thick-thin plate on elastic continuum considering both normal and tangential resistance is presented. It can be used in upper structure-foundation-soil interaction analyses. By means of comparing this consequence with the one from thin plate-theory, the application scope and correction of thick-thin plate-theory are concluded.