| In recent years, rapidly increase with China’s GDP and constantly improve of the science of architecture’s level. With the population explosion, highlights the intense of urban construction land. A large number of cities have been built or are building hundred meters high buildings. Hybrid structure came into being in this background. Hybrid structure has combined the advantages of steel structure and reinforced concrete structure, fully exert the fortes of both steel and concrete. It has incomparable advantages on seismic behavior and applicability.As a new type of building structure, composite structure has already used in many buildings around the world. But there are still existed a few problems in practical application. These problems restrict the popularization of composite structure. The current research mainly concentrated in the seismic behavior of steel reinforced concrete (SRC) column-steel beam or reinforced concrete (RC) beam joint, and the research on new type of SRC beam-column joints about simplify construction process is still little. The beam-column joint is the key part of structures, the performance of joints directly related to the seismic behavior of the whole structure. In the existing norms and actual projects, the forms of conformation are all use the type of column stirrups pass through the holes in the web of steel beam. But in the actual constructed, column stirrups can’t pass through the holes in steel beam’s web easily and can not guarantee the construction’s quality.This thesis by improve the SRC beam-column joint existed and based on the constructed form of SRC beam-column joint provided by the code design three type of SRC joint:SRC-01is the traditional SRC joint;SRC-02use the steel jacket instead of closed stirrup in the joint core, The steel jacket is arranged around the joint core and in the middle of the flanges of the steel beam.lt is fixed to the web and flanges of steel beam by welding;SRC-03lengthen the steel jacket of SRC-02,The steel beam can go though the steel jacket,The steel jacket is fixed to the flange of steel beam by welding. This thesis takes beam end low cyclic load test of three type specimens to research their seismic performance. According to the phenomenon and measured data, compare the failure mode, ultimate bearing capacity, strength degradation rule, hysteretic characteristics, dissipation capacity and strain distribution of specimens. The results shows:The failure mode of three type of specimens are the shear failure of joint core,Shear angle are between5°and6°.The shear deformation of all specimens are obvious.The crack of concrete in the joint core is shear crack, The shear crack of SRC-03are most obvious,The shear crack of SRC-03are main diagonal crack.The yield load,the ultimate load,the ductility,the equivalent viscous are not obvious difference of three type of specimens.After the experiment, use the finite element analysis software ABAQUS to simulate the specimen in the experiment. The results of finite element analysis and experiment were coincided, that verified the finite element analysis on SRC beam-column joints is feasible and reliable. Then, by change the parameters of the height and thickness of column web and width and thickness of beam flange, establish the finite element models to simulate. Compare the results of finite element analysis, we can get the conclusions:Increasing the thickness of column web and the width of column flange can improve the bearing capacity obviously;The strength grade of concrete and axial compression ratio can improve the bearing capacity at a certain level,but,the ductility decrease;Improving the stirrups ratio of SRC-01and the thickness of steel jacket of SRC-02can improve the bearing capacity very little.Finally, The following conclusions:(1) Using steel jacket instead of closed stirrups has little influence on the bearing capacity and seismic performance;(2) Increasing the thickness of column web and the width of column flange can improve the bearing capacity obviously;The strength grade of concrete and axial compression ratio can improve the bearing capacity at a certain level,but,the ductility decrease;Improving the stirrups ratio of SRC-01and the thickness of steel jacket of SRC-02can improve the bearing capacity very little. |
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