Soil-Foundation-Structure Interaction Analysis Of Tall Buildings Built On Karst Region

Structure-Foundation-Soil interaction is a research subject for decades. It includes many subjects such as structural engineering and rock and soil engineering. New problems and challenges always well up when researchers and structural designers deal with high-rise buildings on complicated ground .Much research has been done before, among which ,main results were qualitative. Compare with normal design principle and analysis method, the pith of interaction analysis is displacement compatibility condition. It means, not only the equilibrium of force equations set but also the equations of compatibility of displacement should be taken into account at the interface between structure, foundation and soil. This thesis aim at frame-tube structure with raft foundation on karst zone. Using finite element method ,both elastic model and elastoplastic model, to analyse the force and displacement of structure, foundation and rock ,when Structure-Foundation-Soil interaction is taken into account , and compare it with results calculated by the normal structure analysis method ,in which, interaction is not calculated. The 3D finite model include structure, foundation and soil, thus, Structure-Foundation-Soil interaction has been taken into considered automatically. According to the results, suggestion is given to the structural design. The main points of this paper are as follows: â—‹1 According to the result of comparison analysis, analyse the intensity, stability and settlement of the cave in the sample. Give suggestion to the structure design and raft foundation design â—‹2 Build the elastoplastic finite element model find the plastic area in the structure and foundation Compare the result of elastic finite element model with which of elastoplastic finite element model. â—‹3 Compare the stress change of uperstructual caused by interaction And analyse the change of stress with the adding of story; Compare the stress change of raft foundation; Analyse the relationship between the stress of raft foundation and location of uperstructual components; Also analyse the stress statue and settlement of caves in the rock;Compare the influence of rock parameter to the settlement of basement.