Structural Seismic Analysis Of The Mixture Of VID And BRB Damper

Traditional building structures are designed to resist earthquake force with their own aseismic capacity(stiffness,strength,ductility),which is an extremely passive aseismic means.With the rapid development of the construction industry,energy dissipation has been widely used in various engineering examples.It can effectively reduce the seismic response and has good application prospect.However,most of the research objects are single damper,while few studies on mixed damper are conducted.By referring to various books and domestic and foreign literatures,this paper summarizes the experimental research and engineering cases of using anti-buckling support,viscous damper or mixed damper.In this paper,first of all,the development of energy dissipation technology and steel structure is briefly described.When the structure is excited by earthquake,the local bars will be in the nonlinear state early.In this paper,the fast nonlinear time history analysis method is adopted to calculate and analyze the high-rise steel frame with additional damper.Taking a high-rise steel frame project as the calculation model,SAP2000 finite element software was used to do modal analysis and time analysis on the structure.Through the analysis of the different three kinds of seismic wave input,viscous dampers under different arrangement and the buckling support damping effect,it is concluded that damping characteristic of them,then sums up the experience of the arrangement of hybrid damper,analysis of hybrid damper in horizontal and vertical directions on the layout plan,through the analysis of the numerical comparison of the results,it is concluded that damping effect is good layout.The results show that the damping effect of the additional damper is better than that of the original structure.The inter-layer shear force,inter-layer displacement and the maximum displacement of the top layer are reduced.The viscous damper can provide damping for the structure.The anti-buckling support provides stiffness for the structure with little damping.When the bare frame is stimulated by earthquake,it is mainly caused by interlayer shear deformation,while the anti-buckling support frame is set with the characteristics of bending deformation,so BRB can be arranged at the bottom of the structure to provide stiffness for the structure.When choosing the reasonable layout scheme,the damping effect is better than that of a single damper,and the quantity can be reduced and the cost can be reduced.When layout is considered in the vertical direction,two kinds of dampers should be set uniformly on the lateral side of the structure,the anti-buckling support should be set on the lower part to adjust the stiffness,and the viscous damper should be set on it to give play to the speed energy dissipation characteristics.When horizontal layout is considered,the anti-buckling support is set at the bottom of the outer part of the structure to better restrain the deformation,and the viscous damper is set at the lower and middle floors of the structure to better play its damping role.Therefore,when anti-buckling support and viscous damper are used to reduce the vibration of high-rise steel frame structure at the same time,they can well coordinate their work and effectively reduce the dynamic response,which is a very effective use method in energy dissipation damping technology.More layout schemes and methods are worth studying.