钢框架中可更换橡胶抗弯耗能阻尼器减震性能分析

Aseismic performance of replaceable moment-resisting elastomeric dampers for steel frames

为钢框架结构提出一种可更换橡胶抗弯阻尼器,装配于钢梁的端部,不额外占用建筑空间。阻尼器包括橡胶段与保险丝段两部分,可在地震过程中提供分段自适应的被动耗能。首先阐明了此类阻尼器的作用机理,并对其提供了简要的抗震设计方法,并介绍了橡胶材料及橡胶段的动力试验;随后,对一典型钢框架结构进行算例分析,比较使用与未使用阻尼器两种情况下结构的地震响应。计算结果表明:橡胶抗弯可更换耗能阻尼器可为钢框架结构提供有效系统阻尼,通过将耗能与破坏聚集于阻尼器的不同部位,使结构中其他构件基本维持在弹性阶段,从而有效降低或消除结构残余位移;同时,阻尼器中的保险丝段为可更换构件,可显著提高整体结构的抗震性能与震后可恢复性能。

In this paper,a replaceable moment-resisting elastomeric damper(RMED) for steel frame structure was proposed,which could be installed at the ends of steel beams occupying no additional building space.The damper was composed of rubber segment and fuse segment,which as a whole provide piecewise adaptive passive energy dissipation against various earthquakes.Firstly,the mechanism of the type damper was explained,and a brief aseismic design method was provided.Subsequently,dynamic tests of rubber material and the rubber segment were performed.Then,an example was provided using a typical steel frame structure.The seismic responses of the structure with and without damper were compared.The results showed that the new type of damper could provide effective system damping for steel frame structures;by concentrating energy dissipation and failure at different positions of the damper,other members in the structure are generally kept in elastic stage against major earthquakes to effectively reduce or eliminate residual displacements of the structure.In addition,the fuse segment of the damper is a replaceable component,which could significantly improve the aseismic performance and the post-earthquake fast-recovery performance of the target structure.