Study on the influence of viscous damper parameters on the damping efficiency of frame structure
By exploring the influence of viscous damper parameters in frame structure on the structural damping efficiency,the optimization problem of viscous damper parameters is studied.A three-dimensional finite element model is created using nonlinear dynamic time-history analysis for a frame structure.Various damping indices,such as additional damping ratio,reduction rate of vertex displacement,reduction rate of base shear force,and utilization rate of inter-layer displacement,are studied.The study begins with a sensitivity analysis to examine the influence of different viscous damping parameters on each index.Next,a response surface method is utilized to establish a relationship model between the viscous damping parameters and the indices.The fitting accuracy of this model is evaluated using the F test and the judgment coefficient R2.Finally,an objective function for key damping indices is developed,and optimal parameters are determined through optimization techniques.The results demonstrate that the traditional sensitivity analysis method may not comprehensively consider the collective influence of different damping efficiency indices.On the other hand,the response surface method provides high fitting accuracy and good predictability and can serve as an effective optimization model.Moreover,after considering the stiffness of the supporting members matching the parameters of viscous dampers,the feasibility of the optimal damping parameters is proved by the practice of actual engineering cases.A set of simple and easy-to-operate parameter optimization design method of viscous dampers is proposed,which provides important guidance for damping design of frame structures in the future.
energy dissipation structureframe structureviscous damper parameterdamping efficiencyresponse surface method
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