Development Of Software Interface Program For Structural Models And The Applications In Analysis Of Seismic Behavior Of Structures Based On ABAQUS

As the large complex high-rise structures and long-span spatial structures keep arising, the effective and accurate performance of elasto-plastic time history response analysis of the complex structures under severe earthquakes becomes an important research point in the area of the structure design. Associating the FEM (Finite Element Method) software ABAQUS and the professional design software SAP2000 and ETABS, the refined constitutive models of concrete and steel which are applicable to be used in ABAQUS were developed, through which the integrated effective process of the seismic response analysis of complex structures was set up. The main research topics and results are summarized as follows:1. To utilize the effective pre-processing functions of the professional design software and the powerful analysis functions of the FEM software, the software interface program EPHA was developed to bridge FEM software and professional design software. This program can quickly simulate several types of concrete members in ABAQUS , based on which the goal of combining the advantage of effective model development in ETABS、SAP2000 and accurate analysis in ABAQUS was achieved. This work forms the first body of analysis technique and the beginning of the following elasto-plastic time-history analysis of complex structures.2. Based on the subroutine function of the FEM software ABAQUS, the uniaxial hysteretic constitutive model of the concrete for the fiber cross-section truss elements was developed. By comparing with the experimental data, the validity of the model to simulate nonlinear dynamic response of the reinforced concrete truss structure was verified, providing the theoretical guarantee for the accurate elasto-plastic seismic response analysis of the complex structures.3. By using the EPHA interface program and the developed concrete uniaxial material subroutine program, the time history response analysis of a reinforced concrete frame-shear wall structure under severe earthquakes was carried out, and the characteristics of dynamic response and failure modes of the structure were examined. The results showed that the techniques and methods used in this thesis were able to qualitatively describe the dynamic response of the structures under severe earthquakes, and effectively predict the failure location and the response time-history of the mainbody members of the structure, and finally predict the weak parts of the structures.4. In the same sense, the nonlinear time-history analysis of the Jinzhou Seafront Sports Centre under the severe earthquakes was also carried out to verify the applicability of the programs and methods above for the long-span complex structures system. Based on this analysis, the damage level and the weak location of the long-span steel structures can be preliminarily predicted.The practicability of the interface program EPHA developed in this thesis was proved through the successful transfer of models between different softwares for the complex structures. The problem that embedded concrete constitutive model in ABAQUS can not simulate the truss members was solved by using the developed concrete material subroutine, which is verified by the analysis of some real engineering projects. This work significantly improved the efficiency of the dynamic response analysis of complex structures under severe earthquakes.