Element Analysis On The Behavior Of Joints Between Steel Beam And Steel Reinforced Concrete Columns

Steel reinforced concrete structure will be one of main structures used in high buildings in the future, But the research on properties of this structure isn't sophisticated. In order to develop a more thorough understanding of the behavior of SRC beam-column joints,the study on nonlinear finite element analysis is very necessary. In this paper, the SRC column and steel beam joints are analyzed by the ANSYS nonlinear finite element software under low reversed cyclic loading. Separate-finite element model is adopted in this letter. Different element types are used in the models. Integral-finite element model is adopted in reinforced concrete and steel bars are diffused in concrete. Bond-slip behavior is not taken into account between all components on the core of the SRC joints. The behavior of joints is analyzed by nonlinear finite element method. According to result of calculation, three failure types are obtained by analyzing the stress and strain of shaped steels, that is beam failure type, mixed failure type and shear failure type. After that the hysteresis loops are analyzed, which are compared with steel joints. The result showed the finite element models can economize time of calculation and satisfy request of calculation accuracy for the joints of beam failure type. However, it showed the models can produce a little error for the joints of shear failure type. On the basis of these, An analysis is developed for influence parameters that have some influence on joints' behavior. The results show that axial ratio has a good effect on crack loading and ultimate loading. That the higher axial ratio is, the higher crack loading and utmost loading is. However increment of axial ratio can enhance force-displacement effect and degenerate stiffness of joints, so axial ratio must be limited. The shear-resistant capacity of SRC column and steel beam joint is improved with increase of the thickness steel web of column. Concrete strength grade has a good and visible effect on crack loading and ultimate loading. That the higher Concrete strength grade is, the higher crack loading and ultimate loading is. Lastly, an equation to calculate ultimate shear-resistant capacity of SRC column and steel beam joint is discussed.