Study On Seismic Performance Of Energy-dissipating Swing Substructure And Frame Structure

The swinging structural system is a common technique to improve the seismic performance of concrete frame structures.And most of the existing studies on the seismic energy dissipation of the swing system rely on the lateral stiffness of the swing structure to make the structure achieve the seismic energy dissipation effect.In the existing research on the combination of energy-consuming components and the swing system,the energy-consuming components are often arranged in the swing structure,and only after the swing structure produces deformation can the energy-consuming components yield to the energy-consuming settings,and it is not convenient for post-earthquake repair and replacement.There is little research on the installation of energy-dissipating elements at the connection nodes between the swinging structure and the main structure.Setting the energy-dissipating member at the connection node can reduce the partial earthquake damage of the swing structure and also facilitate the replacement of the energy-dissipating component after the earthquake.In this paper,a new type of energy-consuming method of swing sub-structure is proposed,in which an external swing sub-structure(made of steel truss)is set up,the swing sub-structure and the foundation are connected by dampers to form an articulation,and dampers are also set up at the connection nodes of each layer between the swing sub-structure and the reinforced concrete frame to realize multi-point energy-consuming and form a new energy-consuming system.The study was conducted mainly from the following aspects.1.A scaled-down model of the prototype structure frame with the geometric similarity ratio of 1/8 and a scaled-down model of the energy-consuming swing sub-structure-frame structure with the same scale were designed and produced,and the model tests were carried out under various operating conditions by adjusting the different connection positions of the dampers.2.Two measured seismic waves and one simulated seismic wave are selected for excitation according to the building seismic design specifications,and the acceleration,velocity,displacement and damper response of the model structure under each connection are obtained.The damping performance of the energy-consuming swing sub-structure-frame structure and the influence of different dampers' positions on thedamping effect are obtained by sorting and analyzing the test results.3.On the basis of the experimental results,a finite element model of the energy-dissipating wiggle-frame structure for each connection type is established for simulation analysis.The table record values of the three seismic waves collected in the experiment are inputted into the finite element software to analyze the elastic-plastic time course of the structure.The finite element simulation results are organized and analyzed to obtain the damping effect of the numerical simulation of the energy-dissipating wiggle sub-structure-frame structure and the influence of different arrangements of dampers on the damping effect.It can be found that the results of the finite element modeling analysis are the same with the actual shaker test results.Through the study of the seismic performance of the energy-dissipating swing sub-structure-frame structure,it is found that the structural system of the energy-dissipating swing sub-structure-frame structure is a new type of structural system in the swing energy-dissipating system,which can improve the energy-dissipating capacity of the frame structure and effectively reduce the earthquake damage,and has a good application prospect in the seismic protection of buildings.