Development And Application Of SBFEM Model Based On ABAQUS Platform

In the current big dam project,the safety and durability of buildings has always been the focus of attention.It is of great significance to describe the stress singularity of cracks and the accurate simulation of dam-foundation dynamic interaction and dam-reservoir hydrodynamic interaction to improve the design level of actual engineering.As a semi-analytical numerical method,the scaled boundary finite element method(SBFEM)can automatically satisfy the radiation conditions at infinity,and only need to be discrete at the boundary of the solution domain to reduce the spatial dimension of the computational domain by one dimension.It has unique advantages in simulating stress singularity and infinite domain.ABAQUS commercial software has powerful nonlinear analysis capabilities,can simulate very large and complex models,and has good openness,providing users with an interface with unit secondary development functions-User Element Subroutine(UEL).In this paper,through the secondary development of ABAQUS,the UEL element is formed and the integrated SBFEM function is realized.The UEL element combines the advantages of SBFEM theory with the powerful analysis capabilities of ABAQUS software.In the process of implementing SBFEM function on ABAQUS software,many important issues need to be solved,such as the embedding of SBFEM theory and post-processing of UEL element.In this paper,the scaled boundary finite element method is used to solve the stress intensity factor and the impulse response function.Secondly,based on the principle of secondary development of ABAQUS,the rules of programming UEL subroutine and the format of ABAQUS input file are discussed.The 3D polyhedral element which can be used for finite field problem calculation based on SBFEM theory is developed.It can be used for stress intensity factor.3D fracture element,and user-defined infinite domain elements considering structure-foundation,structure-infinite water dynamic interaction.For the problem that the UEL element can not be visualized,this paper gives the processing method of UEL displacement visualization by transmitting the variable subroutine,UVARM,and provides some ideas for the visualization of the user elements subroutine of ABAQUS.Finally,in the numerical example,the 3D polyhedral UEL unit based on SBFEM theory is applied to verify the feasibility and accuracy of the UEL elements in the case of coarse grid,the applicability of static and dynamic analysis in engineering problems and the feasibility of visualization processing.The 3D UEL element based on SBFEM theory is used to verify the effectiveness of the UEL element in solving the stress intensity factor.The 3D infinite domainUEL element is used to solve the seismic response problem of the concentrated load and damreservoir water system on the infinite foundation.The applicability of the UEL element to the structure-foundation,structure-infinite water dynamics interaction problem is verified.The work of this paper can combine the advantages of SBFEM with the functions of ABAQUS software to deal with linear and nonlinear problems,and provide a more reliable analysis method for seismic response analysis of complex structural engineering.