结构名义刚重比对隔震效果影响的试验研究  

Experimental study on effect of structural nominal stiffness to weight ratio on seismic isolation

作　　者：尚守平[1] 束洋[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《广西大学学报（自然科学版）》2016年第4期923-929,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家十二五科技支撑项目(2011BAJ08800);湖南省科技计划重点项目(06sk4057)

摘　　要：为判断结构是否能采用隔震结构,在试验的基础上,结合理论与设计经验,提出了一种新的科学指标,即结构名义刚重比λ,并为了简化计算,给出了一种合理的上部结构名义抗侧刚度代替实际抗侧刚度。试验对象为一个采用钢筋沥青隔震墩为隔震层的框架结构,通过改变结构的名义刚重比,对多种工况下的框架模型进行振动台激振试验,得到结构在不同名义刚重比下的减震效果,同时计算机模拟了不同于试验类型的结构在不同名义刚重比下的减震效果。将试验和计算机模拟的结果进行汇总比较,发现名义刚重比对不同类型的结构的减震效果都有明显的影响,即随着名义刚重比λ的增加,减震系数明显减小,表明名义刚重比在判断结构是否采用隔震结构上的科学性。在名义刚重比大于0.5时,宜采用隔震结构。To determine whether seismic isolation structure can be used in a structure,a new factor,named as nominal stiffness / weight ratio λ,is put forward,which is based on the experiment,theory and design experience. And in order to simplify the calculation,a reasonable nominal lateral stiffness is presented to replace the actual lateral stiffness. The test object is a frame structure with reinforced asphalt base isolation layer. After the shaking table test is carried out on the frame structure under various operation conditions by changing the nominal stiffness / weight ratio of the structure,the damping effect of different stiffness / weight ratio of the frame structure is obtained,and the damping effect of different types of structures under different nominal stiffness / weight ratios is simulated by computer. Comparison between the results from experiment and computer simulation shows that the nominal weight / stiffness ratio has obvious effect on different types of structures. The damping coefficient decreases with the increase of the nominal stiffness / weight ratio. So the nominal weight / stiffness ratio is reasonable in determining whether the seismic isolation structure can be usedin a structure. When the nominal stiffness / weight ratio is larger than 0. 5,the seismic isolation structure is suitable for a structure.

关 键 词：名义刚重比 隔震墩 振动台试验 隔震结构 减震效果 

分 类 号：TU352[建筑科学—结构工程]