隔震层与上部结构刚度比对隔震性能的影响

发布时间：2018-04-13 20:20

本文选题：基础隔震 + 隔震墩　；参考：《湖南大学》2015年硕士论文

【摘要】：近年来,我国地震更加频繁,带来了巨大的人员伤亡和财产损失。在众多的抗震方法中,基础隔震因为其清晰的概念和有效的减震能力脱颖而出,成为了抗震领域的研究热点。基础隔震的隔震效果主要是通过隔震层较小的水平刚度实现的,因此对隔震层水平刚度的研究,以及上部结构抗侧刚度与隔震层水平刚度比对减震效果的影响研究显得尤为重要。本文首先提出了刚度比的概念,即上部结构抗侧刚度与隔震层水平刚度的比值,并简单介绍了测定刚度比的两种思路。然后以钢筋沥青隔震墩作为隔震层,钢框架模型作为上部结构,进行了刚度比的测定试验。在实验室进行了两层与三层的钢框架模型振动台试验。通过增加钢斜撑改变钢框架抗侧刚度,通过不同层数改变钢框架高宽比,测得各种工况下的钢框架抗侧刚度与隔震层水平刚度比。对各种工况下的钢框架模型进行振动台激振试验,研究不同刚度比情况下的钢框架模型动力特征及减震效果,并与不同高宽比情况下的减震效果进行比较。通过钢框架振动台试验数据分析,发现刚度比对减震效果的影响显著。刚度比越大,隔震系数与顶层相对位移越小,减震效果越好。拟合了隔震系数均值与刚度比的关系,分析得到为了发挥隔震体系的减震效果,刚度比存在一个最小限定值。同时分析对比数据,发现刚度比对减震效果的影响比高宽比更为显著。
[Abstract]:In recent years, earthquakes in China have become more frequent, resulting in huge casualties and property losses.Among many seismic methods, foundation isolation has become a hot research area because of its clear concept and effective damping ability.The isolation effect of base isolation is mainly achieved by the small horizontal stiffness of the isolation layer, so the horizontal stiffness of the isolation layer is studied.It is particularly important to study the effect of lateral stiffness and horizontal stiffness ratio of isolation layer on the damping effect of superstructure.This paper first puts forward the concept of stiffness ratio, that is, the ratio of lateral stiffness of superstructure to horizontal stiffness of isolation layer, and briefly introduces two ideas for measuring stiffness ratio.Then, the stiffness ratio of steel frame model and reinforced asphalt isolation pier are measured by using the reinforced asphalt isolation pier as the isolation layer and the steel frame model as the superstructure.The shaking table tests of two and three layers of steel frame model were carried out in the laboratory.The lateral stiffness of the steel frame and the horizontal stiffness ratio of the isolation layer were measured by increasing the steel diagonal brace and changing the ratio of height to width of the steel frame with different stories.The dynamic characteristics and damping effect of steel frame model under different stiffness ratios were studied by shaking table excitation test under various working conditions, and the results were compared with those under different aspect ratio.Through the analysis of the test data of steel frame shaking table, it is found that the stiffness ratio has a significant effect on the damping effect.The greater the stiffness ratio, the smaller the isolation coefficient and the relative displacement of the top floor, and the better the damping effect.The relationship between the mean value of isolation coefficient and the ratio of stiffness is fitted. In order to give full play to the effect of the isolation system, the stiffness ratio has a minimum limit value.At the same time, it is found that the effect of stiffness ratio is more significant than that of aspect ratio.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.12

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