同时设置金属和粘滞阻尼器的钢框架结构减震效果研究

Research on Damping Effect of Steel Frame Structure with Metallic Damper and Viscous Damper

利用有限元软件SAP2000对同时设置金属阻尼器和粘滞阻尼器的15层钢框架结构分别作了多遇地震和罕遇地震下的弹塑性时程分析。分析中,所有阻尼器均布置在横向框架的两个边跨,根据两种阻尼器组合方式的不同定义了不同的分析工况,且比较了各工况时的楼层最大位移、层间最大位移角、层间最大剪力系数等地震响应值,从而讨论了各自的减震效果。研究结果表明:同时使用金属阻尼器和粘滞阻尼器进行减震控制时,两者可以较好地协同工作,从而减小结构的地震响应值,而且通过合理地调整其相对位置与数量,可以将结构在地震作用下的各响应值控制在理想的范围内。与此同时,仅需在结构下部2/3左右楼层设置阻尼器就能够较好地控制结构各层的侧移,从而取得较好的经济效益。本文的研究结果可为结构抗震设计提供有益的参考。

The elastic-plastic time-history analysis is made on one 15 floor high steel frame structure with metallic dampers and viscous dampers at the same time under frequently occurred and rarely occurred earthquakes by finite element software SAP2000.All dampers are arranged in two side spans of horizontal layers of the frame during the whole discussion.Different working conditions are delimited in accordance with different combinations of the two dampers.Then,damping effects of different conditions are discussed by comparison with the earthquake response,including maximum displacement of each floor、maximum inner-story drift angles、maximum inner-story coefficient of shear and so on.The result indicates that： when metallic dampers and viscous dampers are used for vibration control,they can not only work together well and reduce the value of seismic response of structure,but also control the earthquake response in the ideal range through reasonable adjustments to their relative location and numbers.At the same time,the lateral displacement can be well controlled at all levels when dampers are set up in the lower 2 /3 floors of structure,thus better economic benefits are achieved.The conclusions from this paper can provide useful reference for seismic design of structure.