(湖南大学土木工程学院，长沙 410082)

［摘要］ 为了判断结构能否采用隔震技术，提出了名义刚度比的定义，即上部结构名义水平刚度与隔震层水平刚度之比。通过理论分析计算，得出不同基本周期的上部结构减震系数随名义刚度比的变化曲线，曲线变化趋势表明减震系数随着名义刚度比的增加逐渐减小，当减震系数达到0.5以下时，隔震结构名义刚度比不宜小于17。为验证减震系数随名义刚度比变化曲线的合理性，进行了振动台激振试验，试验对象为一个9层框架结构模型，根据设定的减震目标，由减震系数随名义刚度比的变化曲线得到隔震结构的最小名义刚度比，对隔震层水平刚度设计后进行振动台激振试验。试验结果表明，结构减震效果明显，符合预期减震目标，减震系数随名义刚度比的变化曲线可为隔震结构设计提供参考。 

［关键词］名义刚度比； 减震系数； 振动台试验； 隔震结构； 地震反应 

中图分类号：TU352 文献标识码：A文章编号：1002-848X(2021)12-0075-04

Application range of isolation structure based on nominal stiffness ratio 

SHANG  Shouping,  LI  Xiaoyu 

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

Abstract: In order to determine whether seismic isolation technology can be used in a structure, the definition of nominal stiffness ratio was proposed, which is the ratio of the nominal horizontal stiffness of the superstructure to the horizontal stiffness of the isolation layer. Through theoretical analysis and calculation, it was obtained that the damping coefficient curve of superstructure with different basic periods changes alone with the nominal stiffness ratio, and the curve shows that the damping coefficient decreases obviously with the increase of the nominal stiffness ratio. When the damping coefficient reaches below 0.5, the nominal stiffness ratio should not be less than 17. To verify the rationality of damping coefficient curve, the vibration test of shaking table was carried out, the experimental object is a nine-story frame structure model, according to the set damping target, the minimum nominal stiffness ratio of isolation structure was obtained from damping coefficient curve, after designing the horizontal stiffness of the isolation layer, the vibration test of shaking table was carried out. The test results show that the damping effect is obvious, which is in line with the expected damping target, damping coefficient curve can provide a reference for the design of isolation structure. 

Keywords:nominal stiffness ratio； damping coefficient； shaking table test； isolation structure； earthquake response

*国家十二五科技支撑计划（2015BAL03B01）。

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