Analysis of Mechanical Properties of Joints and Frames with Cantilevered Beams Based on Joint Simplification Theory

To improve the efficiency of finite element numerical calculation of steel frame solid structure, the simplified theoretical model of joint was used to simplify the assembled embedded joint with cantilever beam, the assembled reinforced embedded joint with cantilever beam, the traditional beam-column connection joint with cantilever beam and the embedded bolt-welded hybrid joint with cantilever beam. The static analysis and pseudo-static analysis of four joint simplified models, one-story one-bay frame simplified model and frame solid model were carried out by ABAQUS finite element software, respectively. The calculation results of joint simplified model and joint solid model were compared and analyzed, and the calculation results of frame simplified model and frame solid model were compared and analyzed. The analysis results showed that:1) the difference of joint stiffness, yield load and ultimate load calculated by the simplified model and the solid model of the joint under unidirectional static load was small. The hysteretic curve, skeleton curve and stiffness degradation curve of the two models under cyclic loading were basically the same. The joint simplified model could reflect the mechanical properties of the joint solid model largely. 2) Under the action of unidirectional static load, the difference between the yield load and ultimate load of the structure calculated by the frame simplified model and the frame solid model was small. Under the action of reciprocating cyclic load, the bearing capacity, frame stiffness, hysteretic performance and energy dissipation capacity of the frame structure calculated by the two frame models were the same basically, and the calculation results were in good agreement. 3) The joint simplified model and the frame simplified model were used to calculate four kinds of joints and frames with cantilever beam. The calculation results had certain accuracy. Compared with the joint and frame solid model, the analysis efficiency of the joint simplified model and the frame simplified model was improved by more than 95%, and the calculation cost was greatly reduced.