| The elasto-plastic analysis of large-scale reinforced concrete frame structure has been the hotspot in engineering numerical calculation.Based on the secondary development of large-scale finite element analysis software,subroutine of material constitutive relations and pre-processing parameterized rapid modeling are written.And then simulation of beam member under reciprocating loading and elasto-plastic analysis under seismic action are carried out.This method has begun to rise and got a good application in our country.ABAQUS is well known for its ability of solving nonlinear problem.In recent years,our engineering community has been successfully applied it to elasto-plastic dynamic analysis,and the analysis results are widely recognized by experts.But it lacks the concrete constitutive model and reasonable reinforcement constitutive model for the three-dimensional beam element.And based on the ABAQUS platform to build complex high-level structure model is very cumbersome,time-consuming and labor-intensive.These two aspects restrict the efficient use of ABAQUS in the dynamic analysis of large-scale complex engineering structure.In this paper,based on the constitutive model of reinforced concrete and concrete for the fiber beam element developed by the previous research group,the UMAT subroutine of ABAQUS was developed.And the research on data transfer function in ABAQUS is carried out to achieve the purpose of implicit and explicit joint analysis of the dynamic elasto-plasticity of the frame structure,and the ABAQUS parameterized rapid modeling conversion program PA-TRANS[3]is perfected according to the need of this paper.The details are as follows:1.The UMAT subroutine of concrete and two kinds of rebar constitutive models were written by Fortran language,and the UMAT subroutine was tested in unit.The elastio-plastic analysis of low cycle reciprocating load of the RC column model under the ABAQUS implicit module was carried out.The results are in good agreement with the experimental results and with the results of ABAQUS explicit analysis.The UMAT subroutine is proved of the correctness again.2.In the ABAQUS,the import technology was studied,and as the initial state of the step in the explicit analysis,the implicit analysis results into explicit analysis is achieved and.And the examples verify the correctness of the method.3.PA-TRANS conversion program was improved.All types of transitions of sections,load types,hinge restraints,rigid floor,and simulations of construction load are realized.The program is encapsulated,and a visual interface is developed to complete the conversion process of the specific operation and make the program more perfect,and more convenient operation.4.An 11-story reinforced concrete frame structure was constructed by using the engineering design software PMSAP.The finite element model of ABAQUS was transformed into the ABAQUS finite element model by the PA-TRANS transformation program and implicit and explicit joint analysis is used in elasto-plastic dynamic analysis of rare earthquakes.So that the results of implicit static analysis and dynamic characteristics,seismic response and seismic performance of structural construction simulation can be comprehensively and systematically evaluated and studied.lt is further proved that the PA-TRANS conversion program can be used in the dynamic elastoplastic analysis of reinforced concrete structures and greatly improves the modeling and analysis efficiency.It is also proved that it is feasible to use combination method of the explicit and implicit in ABAQUS to analyze the dynamic elasto-plastic analysis of structures under rare earthquake. |
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