Study On Damping Performance Of Metal Damper And Viscous Damper Working Together

Earthquake disasters occur frequently in China,and there are many old and old buildings that do not meet the current seismic fortification level.In order to ensure the use safety of buildings,China’s structural engineers have increasingly improved the research on traditional seismic reinforcement.This kind of reinforcement method has the advantages of simple process and does not affect the use space of the original structure,but the reinforcement effect is not ideal and can not gradually meet the requirements of the current seismic fortification level.Damping reinforcement,that is,adding dampers to the original structure,has a good control effect on the seismic response of the structure,such as interlayer displacement angle and maximum acceleration.It is favored by structural engineers because of its good damping effect.According to different working principles,dampers are divided into two categories:velocity dependent dampers and displacement dependent dampers.Nowadays,the research on the damping performance of a single type of damper is more and more mature,but the research on the damping performance of the two dampers working together in structural reinforcement is not perfect.The main work of this paper is as follows:(1)This paper briefly introduces the traditional seismic reinforcement methods.Based on the existing research on viscous damper and metal damper,this paper introduces the energy dissipation and damping principle and mechanical model of the two dampers,and briefly describes the research status and application status of the two dampers at home and abroad.(2)Introduce performance-based design,combined with energy dissipation and shock absorption reinforcement technology,and give a set of performance-based energy dissipation and shock absorption reinforcement design methods and performance checking methods.(3)The performance-based energy dissipation and shock absorption reinforcement method is applied to the reinforcement project of a inpatient and outpatient building in Hefei,Anhui Province.Due to the change of the use function of the building,the project is transformed from a high-rise plant to a hospital,the seismic fortification category is improved,and the requirements of structural measures are also improved accordingly.According to the structural characteristics and reinforcement difficulties,eight different energy dissipation and shock absorption reinforcement schemes with viscous dampers and metal dampers are given,The calculation and analysis models of the original structure and eight damping structures are established,and the time history analysis is carried out under three waves of frequent and rare earthquakes respectively.Taking the structural displacement as the index,the damping performance of metal damper and viscous damper working together under different schemes is compared,the influence of the relative position and relative quantity of the two dampers on the damping performance in structural reinforcement is studied,and the final damping reinforcement scheme is selected.(4)Based on the above discussion,the optimal reinforcement scheme is discussed,and the dynamic time history analysis is carried out under seven waves of frequent earthquake and three waves of rare earthquake respectively.The changes of floor shear force,inter floor displacement angle,vertex acceleration,velocity and energy dissipation before and after shock absorption are compared to further evaluate the seismic reduction effect.At the same time,the performance of the damping structure under large earthquake is checked to judge the failure state and performance level of beams,columns,shear walls and energy dissipation substructures.Explore the specific damping effect of the two optimal cooperative working modes of dampers in practical engineering.(5)After the shock absorption and reinforcement of the final reinforcement scheme,the shock absorption effect of the two dampers is good,the seismic performance of the structure is greatly improved,the expected performance target is reached,and the performance 2 low ductility structure requirements in the specification are met,and the seismic structure measures of the reinforcement object can be reduced by one class.Viscous damper and metal damper have their own advantages in vibration reduction and reinforcement.This paper aims to explore the vibration reduction performance of the two dampers when they work together in combination with the performance-based energy dissipation and reinforcement method,so as to provide a useful reference for popularizing the application of the two dampers in vibration reduction and reinforcement engineering at the same time.