Effect Of Damage Of Viscous Dampers On Seismic Performance Of Suspension Bridges

With the development of economy and the improvement of science and technology,the design and construction of building structures tend to be super-high and long-span structures.Faced with more stringent structural requirements,stiffness and damping are decreasing,and the building is more sensitive to external loads,which promotes the wide application of structural vibration control technology in order to ensure the safety and comfort of the structure.Among them,viscous dampers have become the first choice for many building control because of their excellent performance.However,due to their own structural reasons,the leakage of viscous dampers generally exists.Therefore,the impact of viscous dampers damage on structural vibration control is an important issue of great practical significance and research value.In this paper,a typical double-tower suspension bridge is taken as an example.A three-dimensional finite element model is established by Adina,and a non-linear gap element is introduced to establish a damper calculation model which can simulate damage.The natural vibration characteristics of the controlled bridge model and the dynamic time history analysis under different damage conditions are carried out.This paper mainly carries out the following aspects of research Firstly,the structural vibration control is summarized,including its development history,classification and characteristics of various control forms;the influence of damper damage on control effect at home and abroad is elaborated;a three-dimensional non-linear finite element model of a double-tower suspension bridge is established,with a span of 150 m+460 m+150 m and a tower height of 102 M.Secondly,the passive energy dissipation system of the structure is introduced.The influence of additional damping on the seismic response such as maximum displacement and dissipated energy is explained in detail.The structure and working principle of several common dampers are introduced.Then,the viscous damper calculation model is established,and the non-linear gap element is introduced to simulate the damper damage.By comparing with the experimental results,the simulation parameters are selected.The model can effectively describe the hysteretic performance of dampers with different damage degrees.Finally,in the finite element model of suspension bridge,the vibration control effects of viscous dampers with different damage levels under ambient vibration and Northridge wave excitation are simulated,and the effects of damper damage degree on displacement control and damper output are analyzed.