大跨空间结构隔震支座的应用研究

Seismic isolation technology application in spatial structures

为进一步完善大跨空间结构支座隔震技术,提出了一种新型的三维复合隔震支座,新开发的支座水平采用摩擦滑移隔震,竖向采用螺旋弹簧或碟形弹簧,基于概念模型设计制作了两类支座,利用振动台试验研究了支座的动力性能,并依据试验结果建立了其理论模型。此外,还对支座在大跨结构中的隔震性能进行了模拟分析,结果表明新开发的支座具有良好的隔震性能,能显著延长隔震结构的周期,并使轴力相应的峰值降低幅度在50%以上。

In order to overcome the disadvantages of the current bearings,a new kind of three-dimensional seismic isolation bearings is then introduced in this paper.The new bearing is combined a friction sliding system in horizontal direction with a helical springs or disc springs in the vertical direction.Based on the conception model,two practical bearings are designed and manufactured.Experimental study on the characteristics of the bearings is carried out on shaking table.Meanwhile,a theoretical model of the bearing is established.Finally,some details related to the dynamic analysis of isolated spatial structures are discussed.It is shown that the proposed bearings perform satisfactorily seismic isolation properties,and the periods of the isolated structure is prolonged,meanwhile,the axial force response is reduced 50 percent as well.