Seismic Performance Of Combined Energy-dissipative And Replaceable Coupling Beams

As as a kind of effective lateral force resistance member,the shear wall bears most of the shear during the earthquake in high-rise building structure.Coupling beams are important components in shear walls.On the one hand,it is link with the walls,adjust and protect the shear wall have enough lateral rigidity.One the other hand,it is as the first measure to resist earthquake energy.However,in practical engineering,the coupling beams are prone to brittle shear failure in practical engineering,and it is difficult to repair and replace after the earthquake.By the means of installing dampers in coupling beams to change the stress modes,the energy and damage are concentrated in the dampers,so as to protect the walls and the beam is easy to repair and replacement after the earthquake.This way has become a new direction of the field of energy dissipation.Metallic dampers,friction dampers,viscoelastic dampers and other types of dampers,which are installed in the middle of the coupling beams,are the typical dampers of replaceable coupling beams.Each dampers have its owns advantages,disadvantages,and the scope of application.A new combined damper is put forward by our group,which can reflect the advantages of viscoelastic dampers and metal dampers when they work together.This new damper had been used to analyzing in theory and finite element simulation.The main contents and conclusions are as follows:(1)The characteristics of coupling beams in high-rise shear wall structure.Building two models by YJK,in which a kind of beam is ordinary frame beam,and anther kind of beam is coupling beam in shear wall.The comparison between the results shows that it is reasonably to install dampers in the middle of beams,Considering the seismic performance of this high-rise shear wall structure,we put forward the shear limit displacement of coupling beam damper and the range of loading frequency of this new damper.(2)Finite element analysis of combined dampers.Building the model of combined dampers by the finite element analysis program ABAQUS.Viscoelastic material,constitutive model of low yield point soft steel,and energy consumption principle are studied emphatically.It is proved that the combined damper havereasonable structure and good seismic performance by comparing the finite element simulate hysteresis curve and stress-strain curve of this damper.In the end,analyzing and simulating the restoring force model of combined damper,which testify that constitutive model is correct.(3)The seismic performance of the distribution of coupling beam dampers in the shear wall.Comparing analysis the seismic responses of a 16-story traditional double shear wall and the model with replaceable coupling beams,at the same time analysis the seismic response effect of four different distribution of beam damper,including base shear,peak acceleration,displacement between layers,and the damage of shear walls and coupling beams.The results show that the dampers installed in the middle of beams and interlayer to install dampers along the height show better seismic performance.(4)Elasto-plastic analysis of the traditional frame-wall structure and the new frame-wall structure with combined energy-dissipative coupling beams against earthquake.The frame-wall structure designed by YJK,there are 12 floors in this building,and the reinforcement drawing of each structural members is obtained.Based on finite element analysis program ABAQUS,the traditional reinforced concrete frame-wall structure and the frame-wall structure of the coupling beam with combined damper are established,the models were used to research the elasto-plastic time history analysis,The vertex displacement,base shear,interlayer displacement,damage of shear wall and coupling beam,and the results show that seismic performance of the frame-wall structure of the coupling beam with combined damper structure is superior.