Study On The Application Of Viscous Fluid Damper In Seismic Strengthening Of Frame Structure

The traditional seismic strengthening technology is to resist the seismic action by changing the structure’s own performance,but because the earthquake has a large randomness,it is difficult for the structure to ensure the safety under the action of strong earthquakes.The energy dissipation and damping technology can reduce the seismic response to the purpose of seismic strengthening by installing the energy dissipation damping device(such as viscous dampers)in the original structure,And comparing with the traditional anti-seismic reinforcement “hard resistance” idea,with the effect of remarkable advantages in shock absorption.This paper makes analysis and research on the application of viscous dampers for seismic reinforcement in frame structure.The main work of this dissertation is as follows:(1)Described the technology of traditional seismic reinforcement and the energy dissipation,through analyse two reinforcement technology and characteristics of the application,the energy dissipation in the existing reinforcement technology has damping effect of seismic strengthening in building structure more obvious advantages.(2)This paper introduces several kinds of commonly used viscous dampers and their mechanical calculation models,and selects the appropriate mechanical model according to the energy dissipation principle of the damper.The method of calculating the seismic analysis of the damper structure is analyzed,and the fast nonlinear time history analysis method in the dynamic time history analysis is introduced in detail.(3)Combined with the engineering example,the seismic performance of the damper is applied to the structural seismic strengthening.Using finite element software SAP2000 to carry out reinforced structure time history analysis,and contrasted analysis of dynamic characteristics under frequent earthquake and rare earthquake,The analysis results show that the seismic performance of the structure can be effectively improved by adding a damper,and the performance of the displacement angle,acceleration response and shear capacity of the structure can be greatly reduced.At last,PKPM is used to compare the reinforcement and actual reinforcement of beams and columns.The calculated reinforcement of the structural beam and column is reduced by about 50% after adding dampers,and the structural seismic response is satisfied with the analysis requirement of the eight degree zone fortification intensity.