Study On Seismic Performance Of Energy Dissipation Component Under Bi-Directional Earthquake

This paper introduces the concept and function of energy dissipation components,summarizes the related research on energy dissipation components with different connection modes and different dampers at home and abroad,breaks through the research status of energy dissipation components which only consider one-way seismic response,and advances the research on seismic performance of energy dissipation components under bidirectional earthquake,so as to reveal the force mode and mechanics of energy dissipation components under bidirectional earthquake action.Performance.The displacement damper(steel tube lead damper)was designed and the mechanical properties of the damper were obtained.According to the mechanical properties of the damper,piers,piers and dampers were designed according to the design recommendations of the Technical Regulations for Energy Dissipation and Vibration Reduction of Buildings(JGJ297-2013),and empty frames were designed.ABAQUS is used to load the energy dissipation components with frames in one-way and two-way displacements.The deformation and internal force difference of energy dissipation components under different loading modes are obtained.The results are verified by ETABS structural analysis software.Under biaxial loading,large deformation and internal force will occur in the out-of-plane direction of energy dissipation components,in which the out-of-plane internal force is much larger than that under unidirectional loading,which is a neglected point in most studies when simulating and testing energy dissipation substructures.Because the damper will produce deformation and larger internal force in the out-of-plane direction when the frame is subjected to bidirectional loading,i.e.resultant force in the in-plane direction and out-of-plane direction.According to the principle of yield criterion,under certain deformation conditions,when the stress components conform to a certain relationship,the particles begin to enter the plastic state.When the out-of-plane action changes the yield deformation condition of the damper,the mechanical properties of the damper will change.Four kinds of dampers were designed and loaded with ABAQUS at different angles.The mechanical properties of in-plane and out-of-plane directions of the dampers were studied under different loading angles of each damper.The in-plane and out-of-plane mechanical properties of the damper will change under different loading angles,and the out-of-plane stiffness of the damper will change slightly when the out-of-plane stiffness is larger.When the force in the out-of-plane direction is greater,the mechanical properties of the damper change more obviously.It is suggested that the damper be tested under bidirectional loading.Dampers have certain mechanical properties in the out-of-plane direction.It is suggested that the parameters of dampers be input bidirectionally in the design of energy dissipation and seismic reduction of structures.Two kinds of dampers with different out-of-plane stiffness are used to construct energy dissipation components.According to the height of energy dissipation components,ABAQUS is used to load energy dissipation components in one-way and two-way according to the displacement limit of frame under rare earthquakes.The out-of-plane displacement of dampers with larger out-of-plane stiffness under biaxial loading is smaller,which verifies the principle of force loading for the four dampers.On the contrary,when the out-of-plane deformation of dampers is smaller,the out-of-plane deformation of the connecting support and pier will be larger,and the out-of-plane force will be greater.The external stiffness of the support is small,and the mechanical properties of the energy dissipation components with support connection under bidirectional loading are less changed than those under unidirectional loading.The external stiffness of the pier under bidirectional loading is larger than that under unidirectional loading.The energy dissipation components with support connection under bidirectional loading are lower than that under unidirectional loading.That is to say,the relative connection mode of the damper has enough external stiffness to ensure its mechanical properties.The out-of-plane bearing capacity of piers and the out-of-plane stability of supports are the key to ensure the energy consumption of dampers.According to the design principle of concrete structure,the checking method of out-of-plane bearing capacity of pier is obtained.Based on the theory of large deflection and small deflection,the checking formula for out-of-plane stability of the bearing is deduced.The out-of-plane bearing capacity of the pier and the out-of-plane stability of the designed support are checked according to the analysis of the energy dissipation components in front of the pier.Aiming at the insufficiency of the checking calculation,the design improvement measures are given.The current process of energy dissipation and seismic reduction design of structures has been improved.The design analysis of a teaching building considering the out-of-plane seismic response of energy dissipation components is carried out.The damper is designed according to the structural requirements,and the in-plane and out-of-plane mechanical properties of the damper are obtained under bidirectional loading.When the parameters of the damper are input,the out-of-plane mechanical properties of the damper are considered and not considered.Considering the out-of-plane mechanical properties of the damper,the initial period and floor stiffness of the structure will change,and the displacement angle of the structure will decrease.The out-of-plane force and deformation of the damper and the pier are extracted.Considering the out-of-plane mechanical properties of the damper,the out-of-plane force of the damper will be produced,while the out-of-plane deformation will be much smaller,and the pier will also produce larger out-of-plane internal force and smaller out-of-plane deformation.