Dynamic Analysis Of Superstructure-Raft Foundation-Subsoil Interaction

With the development of China's construction industry, high rise, large-span buildings are widely applied, and at the same time, the technology of computer completely advanced. The subject of interaction of high-rise building and foundation become rapidly a new application subject. In the past, the superstructure was considered independently whose bottom was fixed on the foundation. Apparently this approximately approach was unsuitable for the real situation, especially when earthquake presented, so the design was insecurity or diseconomy. This article has summarized the research approach and achievement of the interaction between superstructure, foundation and soil. According to the theory of the interaction among superstructure, foundation and soil, the soil, foundation and upper structure are studied as a whole in this paper. Selecting appropriate three-dimensional mechanical models and simple effective analytical methods, finite-element software "ANSYS" is adopted to calculate and analyze the models largely in the method of simulation. In the models, the nonlinear material and the nonlinear contact are considered. Superstructure, foundation and soil is a whole system, the consideration of interaction of system is the basis to analyze earthquake response of structure accurately. Aided by the finite element software ANSYS, this paper carries out a dynamical time-domain analysis of construction. Comparing the dynamical response under interaction with non-interaction of the system, it is analyzed for the dynamical characteristic, the lateral displacement, the bottom column's internal force and the distributive curve of the foundation reaction. Some conclusions are made, which are valuable for engineering design. Simultaneously, optimizing suggestions to engineering designs and supplemental revising proposes to current foundation designs.