Research On The Influence Of Viscous Damper On The Seismic Performance Of Reinforced Concrete Frame Structur

With the diversification of building functions and forms,there are higher requirements for the seismic performance of building structures.Energy dissipation and damping techniques reduce the seismic response of a structure by,for example,attaching energy dissipating elements to the structure.Viscous dampers are widely used due to their simple construction,stable performance and the fact that they can be used for both new buildings and existing buildings.At present,most of the research on viscous damping structures is focused on the optimisation of damper parameters and in-plane optimisation,but not much research has been done on the impact of dampers in space on the overall seismic performance of the structure.The design of high-rise buildings must not only ensure that the structural displacements are within the set safety performance targets,but also consider the comfort requirements of acceleration for normal building use,so it is necessary to optimise the design of the structure with multiple objectives.A direct displacement-based seismic design method is used to design the 12-storey reinforced concrete frame structure with additional viscous dampers,adjust the placement of the dampers in the damping structure according to the energy method,and analyse their effect on the control of target parameters such as interstorey displacement angle and acceleration of the overall structure.The main studies include:A brief introduction to the restoring force model of the viscous dampers and their parametric analysis,and an elaboration of a direct displacement-based design method for viscous damped damping structures.The energy method is also used to analyse the hysteretic energy dissipation ratio between the layers and to optimise the design of the damping structure by adjusting the distribution ratio of each layer of the damping coefficient.Through numerical simulation of 1:3 isometric scale test,it is verified that the general finite element software SAP2000 can better simulate the effectiveness of dampers on structural vibration control.A numerical model of the 12-storey reinforced concrete frame structure is established,and the time-time analysis of the uncontrolled structure and the controlled structure with the three arrangements is focused on the seismic effects of the fortification,while the time-time analysis of the rare earthquake effects is carried out to compare the seismic response(inter-storey displacement,storey acceleration,displacement of each storey and shear force of each storey)of the two structures respectively.A PERFORM-3D non-linear analysis model of the seismically damped structure is developed,and the seismic susceptibility of the optimised structure is analysed based on incremental dynamic analysis,and its damage probability model under different intensity earthquakes is analysed to provide a more comprehensive assessment of the seismic performance of the optimised structure.The results obtained can provide a reference basis for predicting the seismic damage and loss of the damped structure.