| The energy dissipation knee braced joint steel frame structure system is a new type of energy-consuming steel frame structure system proposed in this paper.The energy dissipation knee braced is arranged at the joints of the steel frame structure beam-column nodes so that the energy-consuming bracing can be used to connect the beam-column nodes.The effect of yield energy is carried out,in which the energy-consuming bracing uses the Q235 steel with a lower yield point as the energy-consuming core material,the channel material is provided with a channel steel restriction outside,and the channel steel is connected with the steel plate to constrain the compressive buckling of energy dissipation knee braced.In order to facilitate the connection with the beam-column node and avoid stress concentration at the same time,the energy dissipation knee braced at both ends adopts end-amplification,which is equivalent to the function of an energy dissipation damper.The energy dissipation knee braced structure of the steel frame structure is arranged to meet the requirement of anti-side The requirements of the displacement;at the same time,the energy-conserving bracing specimen first yields under the action of the earthquake,the beam-column specimen body is in an elastic phase,and at the same time,the steel frame structural system consumes the energy of seismic transmission through the plastic deformation of the energy dissipation knee braced part;The energy-supporting struts have small test pieces,are easy to install,can be flexibly arranged,and do not change the advantages of building layout at the same time;satisfy the multiple functions of the building under the premise of being easy to replace after earthquake damage,easy to repair,and have a support structure in the future broad prospects.Domestic and foreign scholars have conducted some research on the seismic performance of energy dissipation knee braced joint steel frames.However,they have not proposed a complete research system for seismic framework of energy dissipation knee braced joint steel frames,and have not proposed reasonable and effective in the practical application of energy bracing.The design method is to study the seismic performance of energy dissipation knee braced joint steel frames.This paper proposes a design method and carries out pseudo-static testing of steel frame joints.At the same time,it uses ABAQUS finite element software to analyze and gives energy bracing in the steel frame.Application recommendations in structural systems.Through scholars’ energy-conservation bracing finite element simulation results and experimental data,a better arrangement of energy-conserving braces is obtained.Based on this,three types ofenergy dissipation knee braced beam-column nodes are designed for experimental investigation.The three kinds of test pieces were:beam column just connected energy dissipation knee braced frame node EDKBF1,beam and column articulated energy dissipation knee braced frame node EDKBF2 and beam column just connected node EDKBF3.①EDKBF1 is equipped with energy dissipation knee braced on the basis of the beam-column joint,②EDKBF2 is used to change the rigid connection of the EDKBF1 beam-column into a hinged connection,and pseudo-static tests are performed on the three nodes,③EDKBF3 is a traditional beam-column rigid connection.The pseudo-static test results of energy dissipation knee braced joints are analyzed,and the hysteresis curves,skeleton curves,stiffness degradation curves,energy dissipation factors,ductility coefficients,etc.of three types of nodes are shown to reflect their energy performance capabilities.The analysis results show that:compared with EDKBF3,EDKBF1 has obvious two-stage yield,and it also has higher ultimate bearing capacity and better energy dissipation capacity;EDKBF2 can change the traditional beam-column node mode and has good energy dissipation capability,using large finite element software ABAQUS The above-mentioned energy dissipation bracing node model was established to compare and analyze the results of finite element simulation under low-cycle reciprocating loads.It was found that the finite element was highly consistent with the test,and that finite element software could be used as an effective means for follow-up studies.In this paper,the energy dissipation performance of energy dissipation knee braced joint steel frame structure is studied comprehensively and systematically,and the layout method of energy-conserving bracing among beam-column nodes is proposed,which is important for the further theoretical study of consequent energy dissipation knee braced steel frame.Significance,but also played an important reference role for engineering applications. |
