Study On Mechanical Properties Of Web-connected Replaceable Link Of Energy Dissipation

In the current design method of the eccentrically braced frame structure,both the link of energy dissipation and the frame beam are designed into as a whole,and it is difficult to accurately assess the degree of damage after the seismic action,and it is difficult to repair and replacement of the link of energy dissipation,and increase the project's overall project cost.In order to solve the above-mentioned shortcomings in the design of the eccentrically braced frame structure,it is proposed to design the beam segment of energy dissipation as a separate component,and separate it from the frame beam.Deformation and energy in the earthquake are concentrated on independent the link of energy dissipation to form link of energy dissipation that are easy to repair and replace,so as to achieve the purpose of protecting the frame and brace,and to improve the seismic performance and energy dissipation capacity of the eccentrically braced frame structure,and make simple and efficient the evaluation of the structure after the earthquake.There are mainly two types of connection between the energy dissipation beam section and the frame beam in the K-type eccentrically braced frame,which are the end plate connection type and the web connection type.There are relatively many studies on the end-plate connection energy dissipation beam section at home and abroad.This article focuses on the mechanical properties of the web-connected replaceable link of energy dissipation,and mainly analyzes the hysteretic performance,bearing capacity,ductility,and other mechanical properties of the link of energy dissipation.Through the finite element simulation of 19 replaceable the link of energy dissipation and the experimental study of 8 replacement the link of energy dissipation,the test results are compared with the finite element simulation results,and the following conclusions are obtained: Firstly,when monotonic loads are applied to web-connected link of energy dissipation,they exhibit better ductility and larger initial stiffness,and the ductility coefficients range from 3.92 to 10.97.Secondly,when a cyclic load is applied to the specimen,both the test and the hysteresis loop of the finite element are relatively full.The approximate shapes and trends of the hysteresis curve,the skeleton curve,and the stiffness degradation curve are basically the same.In the test,the energy dissipation coefficient is between 1.59 and 1.96,and the energy dissipation coefficient of the finite element simulation is between 1.60 and 2.74.There is a certain difference between the test and the finite element simulation,but the general rules are the same.Tirdly,the minimum rotation angle of each specimen in the test is 0.16 rad,while the minimum rotation angle of each specimen is 0.21 rad in the finite element simulation,which indicates that the link of energy dissipation has better rotation capability.Fourthly,the energy dissipating coefficient,ductility coefficient,and stiffness degradation ability of the link of energy dissipation with a large crosssection size are all low,and the energy dissipation capacity and deformation capability are poor.The decisive role of the bearing capacity and the initial stiffness is the thickness of the link of energy dissipation web.When the link of energy dissipation web is thicker,the energy dissipation coefficient of the link of energy dissipation is decreasing.Fifthly,the stiffener spacing of webconnected the link of energy dissipation has little effect on the bearing capacity and initial stiffness.Although stiffeners cannot determine the bearing capacity and initial stiffness,slowing down expansion velocity of the shear yield area of webs by setting stiffeners.When the crosssectional dimensions,length,and yield type of the link of energy dissipation are the same,the energy dissipation coefficient of the link of energy dissipation decreases as distance of link stiffener decreases.Sixthly,the yield load,ultimate load,and initial stiffness of web-connected link of energy dissipation decrease with increasing length of the link of energy dissipation.When the cross-sectional dimensions of the replaceable the link of energy dissipation,the number of stiffeners,and the yield type are the same,the length of the link of energy dissipation presents a tendency to decrease the energy dissipation coefficient as the link length decreases.