基于ABAQUS顯式算法鋼筋本構(gòu)模型的開發(fā)及應(yīng)用
[Abstract]:With the rapid economic development of our country, the pace of urban construction is accelerating, and many large bridge structures are built in cities. However, China is one of the countries with frequent earthquakes in the world. Due to earthquake, the pier and abutment of bridges are prone to local damage and damage, even leading to the collapse of the bridge structure as a whole. The local part of bridge pier and abutment usually enters the elastic-plastic state under earthquake action. The traditional elastic analysis method can not effectively describe the actual stress behavior of the structure. How to simulate and calculate the structure effectively has become a hot topic in the field of bridge seismic research. At present, the commonly used large-scale universal finite element software, such as ANSYS,MSC.MARC,ABAQUS and so on, has been used by many scholars in dynamic elastoplastic analysis of structures. The finite element software ABAQUS has a strong ability to solve nonlinear problems and has a good openness. It provides several subroutine interfaces for users and allows users to customize and expand the functions of ABAQUS to realize secondary development. In this paper, the uniaxial constitutive relation of steel bar is studied. Based on the user-defined material subroutine interface (VUMAT), the constitutive model of steel bar is redeveloped. The mechanical behavior of reinforced concrete members under reciprocating load is described more reasonably. The main contents are as follows: (1) through the integration of ABAQUS,Intel Visual Fortran and Microsoft Visual Studio, the connection between ABAQUS subroutine and main program is solved. The secondary development of ABAQUS user material subroutine is realized. (2) on the basis of comparing the existing constitutive models of steel bar, the constitutive model of multi-fold steel bar under cyclic load is selected, which is most suitable for the research in this paper. The second development of the model is carried out, and the VUMAT programming of the reinforcement material model is established, and the meaning of the relevant variables in the subroutine code is explained in detail. (3) A reinforcement element and a reinforced concrete column are used to verify the VUMAT user material subroutine developed in this paper. Finally, the VUMAT subroutine is applied to the seismic response analysis. The user material subroutine developed in this paper takes into account the stiffness degradation and strength degradation of reinforcing bars under reciprocating load simultaneously, which can be used for the nonlinear analysis of simple Liang Zhu members under earthquake.
【學(xué)位授予單位】:南京工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU375
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