(湖南大学土木工程学院， 长沙 410082)

［摘要］从刚度的角度探讨了建筑结构能否采用隔震设计的问题，提出上部结构抗侧刚度与隔震层水平刚度的比值概念。进行钢框架模型激振试验，研究不同工况下的钢框架模型的动力特征，对比分析不同刚度比和高宽比情况下的减震效果。结果表明：刚度比对结构减震效果的影响比高宽比更为显著，《建筑抗震设计规范》（GB 50011—2010）仅以高宽比作为结构是否适合采用隔震技术的唯一判断标准，其科学性值得进一步研究；另外为达到隔震效果，结构刚度比也存在最小限定值。

［关键词］刚度比； 高宽比； 隔震墩； 振动台试验； 减震效果； 隔震系数

中图分类号：TU352文献标识码：A文章编号：1002-848X(2017)08-0106-04

Research on limit value of stiffness ratio for multi-level isolated structure

Shang Shouping， Xiao Cong

（College of Civil Engineering， Hunan University， Changsha 410082, China）

Abstract:From the point of view of stiffness, the isolation design of building structure was discussed and  the concept of ratio for lateral resistant stiffness of the superstructure to the horizontal stiffness of the isolation layer was put forward. The dynamic characteristics of the steel frame model under different working conditions were studied based on the vibration test of steel frame model. Damping effects for structure with different stiffness ratios and aspect ratios were compared and analyzed. The results show that the influence of stiffness ratio on the structural damping effect is more significant than that of  ratio. Code for seismic design of buildings (GB 50011—2010) only adopts height\|width ratio as the only criterion for whether the structure is suitable for using isolation technology, and its scientific worth needs further research. To achieve the effect of damping, structural stiffness ratio should be set the minimum limit value.

Keywords:stiffness ratio； height\|width ratio； isolated pier； shaking table test； damping effect； isolation coefficient

*国家十二五科技支撑项目（2011BAJ08800），湖南省重点项目（06sk4057）。

作者简介：尚守平，教授,博士生导师，Email：sps@hnu.edu.cn。