Simplified Finite Element Analysis Of Pile-raft Foundation And Calculation Program Development

:Pile-raft foundation is a widely used basic form of modern high-rise buildings. Pile-raft foundation bearing mechanism and settlement control in academia and the engineering sector have attracted much attention and have made a large number of valuable research results. But Pile-raft foundation is a very complex system. Pile-soil interaction system involves many factors and the analysis is quite complex.At present, Pile-raft foundation has many problems piled and hasn’t found a satisfactory answer. With the development of computer technology, on the basis of theoretical studies, the use of computer is applied to the finite element numerical simulation analysis of Pile-raft foundation. The traditional finite element method of the pile and raft build a great pile-soil stiffness matrix by dividing unit, it is difficult to apply to large-scale analysis of Pile-raft foundation. This paper studies the suitable simplified finite element analysis method of large-scale and irregular Pile-raft foundation.This paper analyzes the carrying mechanism of Pile-raft foundation in a variety of influencing factors, and summarizes the influencing factors of Pile-raft foundation settlement and settlement calculation method.Based on the analysis of the comparison of the three modes of analysis, a simplified analysis of raft analysis based model is raised. The simplified model is based on the elastic foundation model, the pile foundation part use the spring with the same stiffness of plie to simulate. In the finite element analysis, the choice of an arbitrary quadrilateral coordination unit not only solved the problem of the lack of co-ordination by the general unit but also applies to the complexity of the various forms of irregular basis and irregular cloth pile.According to the composition of the simplified analytical models, sheet element stiffness matrix is corrected,the stiffness contribution of the pile is increased and Pile-raft foundation global stiffness matrix is obtained.On this basis, the use of the FORTRAN language is applied to the implified finite element analysis program development of Pile-raft foundation and the analysis of the results is compared with the the finite element software ANSYS to verify the accuracy of the calculation procedure.The simplified analysis model of Pile-raft foundation is simple and has less parameters, but it has a wider range of applications and the computer program can be given in the form of software, the calculate is also very easy. Through the verification of concrete practical engineering, iit can be extended to the design of Pile-raft foundation. Therefore, this study has great application value and a very wide engineering application prospects.