Test And Application Of A Innovative Adaptive Viscous Damper

In recent years,how to improve the seismic performance of building structures is a major subject of continuous research and exploration in the direction of disaster prevention and reduction.The existing structural seismic practice experience shows that the use of energy dissipation technology can effectively reduce the response of the structure under earthquake and reduce the damage of its components,so as to improve the overall seismic performance of the structure.In many applications of energy dissipation and damping technology,viscous damper is favored in engineering damping design because of its characteristics of no additional stiffness to the structure,little influence by frequency and temperature and strong energy dissipation capacity.However,the traditional constant coefficient nonlinear viscous damper has the disadvantage of "small earthquake and large earthquake can not be taken into account" because its parameters are fixed.Therefore,this paper improves the traditional viscous damper and proposes a new type of variable coefficient viscous damper.The device can adaptively adjust its own characteristics,so as to realize the variable and controllable damping coefficient and meet the specific design conditions and design requirements.The device can also provide variable and targeted damping parameter change strategy for the structure according to the response change of the structure and combined with the optimization goal,so as to achieve the purpose of taking into account "small earthquake and large earthquake".The main research work and results of this paper are as follows:1.This paper expounds the energy dissipation principle and design structure of the new variable coefficient viscous damper,puts forward the adjustment method of two-stage and multi-stage variable damping coefficient,and deduces the theoretical calculation formula of the damping force of the new variable coefficient viscous damper.2.Dynamic mechanical performance tests are conducted on the new variable coefficient viscous damper.The mechanical parameters of the new variable coefficient viscous damper are obtained by multiplying linear regression analysis of the test results.The results show that the damping coefficient C is proportional to the number of cylinders in play;the experimental results are compared with the theoretical analysis,and the influence of the actual loading conditions,loading conditions and the transition mode of the variable coefficient on the error is discussed.3.The dynamic mechanical performance test of the new variable coefficient viscous damper is carried out,and the mechanical model of the device is established.The test results show that the device has stable working performance and can meet the needs of practical engineering.The experimental results are compared with the theoretical values,and the effects of actual loading conditions,loading conditions,variable coefficient transition mode and other factors on the error are discussed.4.Considering the factors of damping rate and damping force increase of variable coefficient damping structure,the working performance evaluation method of variable coefficient viscous damper is established.The evaluation results show that the parameter design method of determining the position of variable coefficient according to the expected displacement of frequent earthquakes has better damping effect,and the comprehensive performance of the damper is more reasonable.