粘滞阻尼器对空间桁架结构减震作用研究

摘要

为研究粘滞阻尼器对大跨空间桁架结构减震控制作用，在某体育馆屋盖不同部位设置粘滞阻尼器，输入三向地震波进行时程分析。以屋盖结构水平向位移、加速度及构件内力为减震控制目标，计算分析表明，设置粘滞阻尼器能有效抑制结构在地震作用下响应；屋盖结构均匀布置阻尼器较集中布置减震效果好；结构减震效果不随阻尼系数的增大而线性提高，且存在较优值范围；不同地震烈度下粘滞阻尼器对空间桁架结构减震控制均有明显效果；粘滞阻尼器在不同地震波输入时滞回曲线均较饱满，呈现典型速度相关型阻尼器特征。研究结果对粘滞阻尼器用于大跨空间结构减震控制具有一定参考价值。%The seismic damage control was investigated for large-span space truss structures by placing viscous dampers at different locations on roof.Time history analyses were performed with three-dimensional earthquake ground motion inputs for a gymnasium building.Taking the displacement and acceleration in the horizontal direction as well as the member forces in the roof structure as the targets of vibration control,the analytical results indicate that the seismic responses can be effectively controlled via installing dampers on the space truss structure.Uniform placement of viscous dampers shows better performance when comparing with that of centralized placement.The efficiency of the seismic response reduction is not linearly increasing with the damping coefficient enhancement,while there is an optimal value existing.The viscous dampers have obvious effects on the vibration control of space truss structure under different earthquake intensity.The energy dissipation hysteresis curves of viscous dampers are all rather full under different seismic waves input,and display the classic characteristic of velocity-dependent dampers.The study provides a valuable reference to applying the viscous dampers in seismic damage control for long-span space structures.