布置黏滞阻尼器的格构式拱形刚架减震控制研究

Research on the Vibration Reduction of Latticed Arch Frame with Viscous Dampers

将黏滞阻尼器引入格构式拱形刚架,分析了阻尼器对结构平面内地震响应的控制效果。通过动力时程分析,研究了多遇地震作用下阻尼器减震效果随阻尼器布置位置、阻尼系数及结构关键参数取值的变化规律;揭示了罕遇地震作用下黏滞阻尼器对结构受力性能的改善机理。研究结果表明:在结构拱柱连接处附加黏滞阻尼器,其竖向减震效果较横向更显著;随阻尼系数的增加,位移减震率先上升后平缓甚至下降;罕遇地震作用时,在体系层面,黏滞阻尼器有效地降低了结构的整体变形;在构件层面,黏滞阻尼器改善了拱脚杆件塑性程度,使结构各构件受力更均匀。

In this paper,a viscous damper is introduced into a latticed arch frame and its control effect on the seismic response of the structure is researched.Through dynamic time-history analysis,the damping effects of the damper under frequent earthquakes on damper positions,damping coefficients and key structural parameters are investigated.The mechanism of viscous damper on improving the mechanical performance of the structure under rare earthquakes is presented.The results indicate that the damping effect of viscous damper arranged at the column-arch junction is more significant in the vertical direction as compared to that in the horizontal direction.With the increase of damping coefficients,the vibration reduction rates of displacement increase firstly and then followed by a slow-growth or decline period.In the structural system level,the viscous damper can effectively decrease the global deformation under rare earthquakes.In the component level,it can also reduce the plastic degrees of the members near arch abutments,and thus make the member internal forces more uniform.