The Simplified Analysis Method For Response Of Nonlinearity Of Elastic Foundation Plate

This paper studies the nonlinear mechanical response of the foundation plate. It is based on the foundation slab of the building which is the platform floating structure, it researches the reinforced concrete rectangle plate on the foundation, priority researches the mechanics function and its interaction of the soil-structure interaction response. Firstly, in one hand, using general—purpose finite element program ANSYS, this paper build up the 3-D solid analytic model of the foundation plate, and uses this model, researches the nonlinear mechanical response of the foundation plate when it was acted on the vertical concentrated load; in another hand, modifies the point of the load, the material analyzed the factors of the plate-soil system, which are the nonlinear soil behavior, the nonlinear state of plate-soil interface ,and the geometric parameter, influence on the nonlinear mechanical response of the foundation plate. Secondly, based on the result of the 3-D finite element numerical simulation and the possessed experimental data; on this basis of the Winker-Foundation model and applied the Kirchhoff Plate Theory and adopted Bouc-Wen model describing the constitutive relation of delayed nonlinear material, one new simplified analysis model of the foundation plate has been established, which can consider the influences of various nonlinear factors. This model can simulate the vertical nonlinear action force of ground soil to the foundation plate, with the vertical nonlinear springs of uniform distribution in pace, and the restoring force of nonlinear spring can be described by Bouc-Wen model. Using this model and its related calculating method, this model can also studies the nonlinear mechanical response of the foundation plate, and discusses the influence of various systematic parameters and nonlinear factors on the response of the foundation plate. Lastly, use this model and its related calculating method, and associate some examples, the mechanical analysis of the foundation plate has been studied. Through comparing the result of the 3-D finite element numerical simulation data, confirmed the accuracy of the model. The results of calculation show that the simplified analysis model set up in this dissertation can simulate efficiently the nonlinear mechanical response problems of the foundation plate, possessing some practicality.