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

To develop a more thorough understanding of the seismic resistance of SRC beam-column joints , the study on nonlinear finite element analysis is very imperial. In the ANSYS software environment, two three-dimensional finite models are constructed, based the experiments of four steel beam-steel reinforced concrete column joints under low reversed cyclic loading by Beijing Polytechnic University (2000). Nonlinear finite element analysis is presented on the behavior of these joints, one is strong-joint ,the other is weak-joint.According to the character of SRC joints, spread-finite element model is adopted. Different element types are used in the models. Steel and longitudinal reinforcements are modeled using 2-nodes link element. Concrete is modeled using 8-nodes Solid element with the performance of crack and crush. Steel is modeled using 4-nodes Shell element with large deformation. Bond-slip behavior is not taken into account between all components on the core of the SRC joints. A good correlation between the finite element model and the experimental results was obtained .It showed the models are accurate. In addition, the conclusion is drawn that Bond-slip behavior has little influence on the capacity of joints, but it has an important influence on the ductility of joints, specially for coral joints.An analysis is developed for Influence factors that have some influence on joints' behavior. The results show that axial ratio has a good and visible effect on the capacity of joints; that the higher concrete strength is, the higher the capacity of joints is; the ratio of reinforcements and the thickness steel web of column have large influence on the ductility SRC joints, not but the capacity of SRC joints.