Seismic Performance Of New Beam-column Joints With Energy Dissipating Fuses

After the Northridge Earthquake and Hanshin Earthquake,it was discovered that the traditional steel beam-column connection joints were prone to brittle failure during the earthquake.To this end,researchers have proposed a method to move the plastic hinges of steel beam-column joints,mainly including weakened joints and reinforced joints.Although these joints can improve the seismic performance of the steel frame,the post-earthquake repair is still very difficult and expensive.In order to achieve the purpose of improving seismic performance and quick repair after earthquake,a new type of steel beam-column connection joints with energy-dissipating fuses is proposed.The energy-consuming fuse is a component made of square steel pipe welded steel plate or directly cast,and is connected to the upper and lower flanges of the steel beam by friction-type high-strength bolts.This paper studies the mechanical model of energy-consuming fuses through theoretical analysis,and proposes a new design method of steel beam-column joints with energy-consuming fuses.The analysis software ABAQUS is used to carry out numerical simulation and parameter analysis of the energy-consuming fuse,and the results are compared with the theoretical analysis.The results show that the numerical simulation and theoretical analysis are in good agreement,and the energy-consuming fuse has excellent deformation,energy-consuming capacity and stable bearing capacity.Increasing the thickness of the square steel pipe of the energy-consuming fuse can significantly increase the strength of the energy-consuming fuse,and increasing the size of the square steel pipe of the energy-consuming fuse has an adverse effect on improving the bearing capacity.In addition,ABAQUS is used to perform finite element analysis on new steel beam-column joints with energy dissipation fuses with different parameters under static and cyclic loads.The stress distribution and deformation of the new joints are studied.The deformation can be well controlled at the position of the energy-consuming fuse.The other components are in the elastic stage and will not be damaged,and can be quickly repaired after the earthquake.By studying the hysteresis curve,skeleton curve and cumulative energy consumption of the new joints,it is found that the new joints has good energy consumption and stable carrying capacity.The factors affecting the seismic performance of the new joints are mainly related to the strength of the energy-consuming fuse.The components that locally weaken the energy-consuming fuse have better energy-consuming capacity and have a very small impact on the carrying capacity.Use ABAQUS to establish three frame models of ordinary steel frame,steel frame with RBS joints and steel frame with energy-dissipating fuse,and carry out exploratory static analysis,modal analysis and response spectrum analysis.It is found that the steel frame with energy-consuming fuse can not only control the damage at the position of the energy-consuming fuse,but also has small residual deformation,which can realize quick repair after the earthquake.