Optimal Design Of Energy Dissipation Mechanism Of Steel Frame Structure Based On Capacity Coefficient

In the seismic design code,the frame usually adopts the design concept of strong column and weak beam,which makes the beam enter plastic deformation before the column.The energy generated by earthquake is mainly consumed by plastic hinges at beam ends and a few column bottoms,so the relative plasticity of beams and columns will directly affect the dynamic response of frames.In order to reasonably plan the relative plasticity of beams and columns,the concepts of capacity coefficient and capacity ratio are put forward,and a steel frame model with capacity coefficient of 1 is established.Based on this model,34 steel frame models with strong columns and weak beams with different capacity coefficients of beams and columns are established.Dynamic time history analysis and modal pushover analysis are used to simulate the model,and the distribution of hysteretic energy consumption of all models is analyzed.The relationship between cumulative hysteretic energy consumption of steel frame structure and capacity coefficient of beams and columns is summarized,and the corresponding formulas are fitted.The main research contents of cumulative hysteretic energy consumption include:1 the influence of capacity coefficient on the total energy consumption distribution of beams and columns of steel frame structure;Influence law of capacity coefficient on energy consumption distribution of beams and columns on different floors;Influence of capacity coefficient on energy consumption distribution of beams and columns in the same floor.This paper analyzes the development process of inter-story displacement and plastic hinge,summarizes the influence of capacity coefficient on seismic performance of structure,and puts forward the capacity coefficient of beam-column of steel frame structure from two aspects of seismic performance and energy consumption...