| The steel reinforced concrete special-shaped column is a form of steel reinforced concrete which is more and more popular in recent years.Compared with reinforced concrete special-shaped,because there have steel in the column,the steel reinforced concrete special-shaped column has better bearing capacity and ductility under the same cross section.These advantages can not only meet the engineering requirement for tall and big span,but also can protect the steel effectively,and the limb width is the same with the thickness of filling wall,so it can combine beautiful with flexibility of building perfectly,provide users with comfortable working space and living environment.Joint as an important part of steel reinforced concrete column structure,which can ensure the overall seismic performance of frame structure,seismic survey results show that the destruction of the joint has often than expected.In this paper,by using the finite element analysis software ABAQUS to establish the cross-shaped steel reinforced concrete column and steel beam joint model,through the analysis of system,the constitutive relationship of concrete steel constitutive relation which is suitable for the model selection of constitutive;Also introduced from the aspects of the theory of finite element software ABAQUS concrete calculation process in the operation process;In the finite element software ABAQUS to determine the unit model,the analysis step of setting,selection of element joint,the interaction between components,the load applied and the boundary conditions are set up,the division of grid,load system,and finally the establishment of a reasonable finite element model for simulation analysis.By studying the seismic performance of this type of joint,in the future for its provides the theory basis for the application of practical engineering.In this paper,through the simulation of the cross-shaped steel reinforced concrete column and steel beam joint in the horizontal reciprocating load,considering the axial compression ratio,bone content,concrete strength grade and steel strength grade four parameters change.Can be seen from the hysteresis curve,the specimens have better energy dissipation,curve graph is full of spindle,no obvious pinch phenomenon,show that specimens with good ductility and plastic deformation ability is strong,can largely absorb seismic energy,seismic performance is good.With the increase of axial compression ratio,the ultimate bearing capacity and stiffness are gradually increasing,when the bearing capacity reaches limit state after falling rapidly,the bearing capacity of downward trend increases with the increase of axial compression ratio is,the ductility of the joint gradually reduce;Along with the bone content increased gradually,theultimate bearing capacity and stiffness of the specimens are gradually improve,as can be seen from the skeleton curve,specimen under the same axial compression ratio,the curve of the four joint at the beginning of the load almost overlap,joint have the same stiffness,and with the increase of displacement,each joint curve under the same displacement of the load there is an obvious difference;With the increase of concrete strength grade,the beam end bearing capacity gradually increased by 5.4%,8.2% and 8.2%;With the increase of steel bone strength grade,the ultimate bearing capacity of the specimen is also gradually increase,skeleton curve appeared a downward trend,the ductility of the specimen is reduced,but the downward trend is not obvious. |
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