| Due to the existence of large general-purpose software,the finite element method enables most junior scholars to use this method for research.The boundary element method mainly exist programs compiled by scholars.These boundary element programs generally lack mature pre-processing and post-processing.Therefore,the boundary element method and the finite element ar e extremely unbalanced in terms of application software.The finite element and boundary element coupling method is a very suitable method for analyzing the problem of soil-structure interaction due to the combination of the advantages of the finite element method to analyze the near-field nonlinear problem and the boundary element method to analyze the infinite field far-field linear problem.At present,most research work on the coupling method of finite element and boundary element is based on finite element program,boundary element program or self-compiled program.For the widely existing finite element software.In order to enable the finite element and boundary element coupling method to analyze actual engineering problems,the mature pre-and post-processing of the finite element software and the efficient nonlinear analysis function can be used.This paper takes ABAQUS as an example.Study the coupling problem of ABAQUS and time-domain boundary element program.Therefore,this paper studies the principles of ABAQUS nonlinear dynamic analysis and calculation,including the central difference method and H.H.T method.And briefly expounds the time domain boundary element method.According to the calculation principle of explicit direct coupling approach.The calculation steps of coupling the central difference method and the time-domain boundary element method are given.According to the calculation principle of implicit iterative coupling approach.The calculation steps of coupling the H.H.T method and time-domain boundary element method are given.Furthermore,it is clear that ABAQUS needs to find the displacement under a given force.The time-domain boundary element program needs to solve the force under the condition of a given displacement.To ensure the coordination and balance of public boundaries.Established a coupling system of ABAQUS and time-domain boundary element program.In the coupled system,the data interaction between ABAQUS and the time-domain boundary element program can be easily realized through the ABAQUS script interface and the coordinator.To solve the coupling problems of ABAQUS and time-domain boundary element program.Use the established coupling system.An explicit direct coupling algorithm and an implicit iterative coupling algorithm are implemented.In the end,this paper analyzes the two examples of infinite cavity and soil-structure interaction of infinite domain holes.The calculation of these two examples both prove the effectiveness and feasibility of the two coupling algorithms. |
