一种轻型消能摇摆架近断层地震响应减震分析

Seismic mitigation of an innovative light energy dissipative rocking frame under near-field ground motions

针对传统摇摆墙自重大、受地震作用强的缺点,提出一种轻型自复位消能摇摆架。将轻型摇摆架应用于一幢六层RC框架,对其构造和减震机理进行阐述。提出摇摆架体和自复位消能支撑(SCED)的设计方法,利用OpenSees对轻型摇摆架减震框架在近场地震动罕遇水平下进行非线性动力时程分析。数值分析结果表明,与原结构相比,加入自复位消能摇摆框架后,有效降低了结构的位移峰值响应和残余位移,框架结构层间位移峰值、层间位移角和残余位移角分别降低了27.2%、38.9%和50%,且层间位移角分布更加均匀,降低了结构因为薄弱层而出现过早失效的可能性。

In order to overcome the disadvantage of heaviness of traditional rocking-wall,an innovative self-centering energy dissipation device,called self-centering energy dissipation light rocking steel frame(EDLRF),is proposed,and is used to a 6-story RC frame.The configuration and vibration mitigation mechanism of the new EDLRF system are presented.The design procedure for the rocking frame and the self-centering energy dissipation braces(SEDB) are suggested,and the nonlinear time-history dynamic analysis of RC frame with EDLRF is performed under near-field ground seismic motions with velocity pulses at rarely-occurred level.Numerical result shows that the peak inter-story drift and inter-story drift ratio of the RC frame with EDLRF is apparently reduced when compared to original structure under the same seismic input considered,more specifically,the peak inter-story drift,inter-story drift ratio and the residual inter-story drift ratio are reduced by 27.2%,38.9% and 50%,respectively.Moreover,the inter-story drift ratio of the structure becomes more even,which reduced the risk of local failure due to weak story and enhanced the energy dissipation ability of the whole structure.