Study On Seismic Performance Of Replaceable Energy Dissipating Beam With Corrugated Web

The traditional eccentrically supported steel frame designs the energy dissipating beam section and the frame beam as a whole,which leads to the design of the corresponding frame beam to meet the requirements of shear yield in the energy dissipating area,and at the same time resist the strain hardening of parts outside the energy dissipating beam The additional internal force is more difficult,and it is difficult to locate the damage of the structure after the earthquake.Therefore,an eccentric support steel frame that can replace the energy dissipating beam section is proposed.The beam section is designed to be separated separately,and the plastic deformation is positioned on a section of the beam during an earthquake to dissipate energy to achieve the purpose of earthquake resistance,while the rest of the components are in the elastic stage.The damage location after the earthquake and the repair and reinforcement problems have been solved.The study found that the flat web of the separated energy dissipating beam section is prone to buckling and instability when it is sheared and yielding,and the energy dissipation cannot be fully utilized after the instability.The corrugated web has a large out-of-plane rigidity and can also provide Larger buckling strength,when used as a web,the wave crest can partly act as a stiffener,reducing the thermal effect and residual stress caused by the welding of the stiffener on the replaceable energy-consuming beam section of the flat web.Based on this,this paper replaces the flat webs of the replaceable energy dissipating beam sections with corrugated webs,and studies the feasibility of the replaceable energy dissipating beam sections with corrugated webs,as well as its mechanical properties and seismic performance.Through unidirectional and cyclic loading of 40 full-scale ABAQUS finite element models with different parameters,the waveform parameters and beam section size parameters are analyzed to determine the mechanical properties and energy dissipation capacity of the replaceable energy dissipating beam section with corrugated webs.influences.Select 7 models with different parameters in the finite element to test,and perform cyclic loading on the 7-th sample to obtain the hysteresis curve,skeleton curve,stiffness degradation curve and failure mode of the sample,and verify the finite element’s failure mode through comparative analysis.accuracy.The main work and research results are as follows:1.Perform finite element unidirectional loading on 39 replaceable energy dissipating beam sections with corrugated webs and 1 flat web energy dissipating beam section.The research results show that the waveform parameter θ(the inclination angle of the inclined plate in the corrugation)increases When it is large,the stiffness,ductility and load-bearing capacity of the beam section increase;the larger the cross-sectional area of the beam section and the greater the thickness of the web,the smaller the ductility of the specimen,and the greater the stiffness and load-bearing capacity of the specimen;The smaller the specimen,the greater the stiffness,bearing capacity and ductility of the specimen.2.The results of the finite element cyclic loading study show that when the waveform parameter θ(the inclination angle of the inclined strip in the corrugation)increases from 30°,the degree of stiffness degradation increases,and the energy consumption capacity is stronger at θ=45°;the waveform parameter b(Increasing or decreasing the width of the corrugated flat plate from 70 mm increases the energy consumption;the smaller the beam section area,the smaller the length ratio,the thinner the corrugated web,the more obvious the stiffness degradation;the larger the beam section area,The smaller the length ratio,the thinner the corrugated web,and the higher the energy dissipation performance of the beam section.When the web height-to-thickness ratio is between 108.67 and 163,the energy dissipation coefficient of the specimen is larger than 2.05,which shows good energy consumption.Energy performance: The stiffness degradation and energy dissipation capacity of the replaceable energy dissipating beam section with corrugated webs is greater than that of the flat web energy dissipating beam section,but the bearing capacity is smaller than that of the flat web energy dissipating beam section.3.The test cyclic loading of 6 replaceable energy dissipating beam sections with corrugated webs and 1 flat web energy dissipating beam section was carried out,and the test and finite element comparative analysis showed that the energy dissipating beam section with corrugated webs was damaged.The pattern is that the inclined plate in the corrugation yields first,then the corrugated flat plate yields,and finally the entire corrugated web yields and forms a diagonal tension zone with a gradually increasing area between adjacent wave crests.At this time,the flange is partially buckled,and then the tension is full.Full web.The failure mode of the test is basically the same as that of the finite element;the waveform parameters θ(the inclination angle of the inclined plate in the corrugation),b(the width of the flat plate in the corrugation)beam section size and web type affect the mechanical properties and energy dissipation capacity of the specimen It is basically the same as the finite element.The accuracy of the finite element is verified.