上部结构刚度与钢筋沥青隔震效果的试验研究与时程分析

发布时间：2018-04-09 13:53

本文选题：钢筋沥青隔震技术　切入点：隔震效果　出处：《湖南大学》2015年硕士论文

【摘要】：随着城镇的快速发展,建筑结构的高度越来越高,逐渐由低矮建筑向多高层建筑发展,尤其是抗震意识薄弱的地区,迫切需要廉价有效的隔震装置和简单实用的隔震结构设计方法。本课题组经过几年的努力,研发出一种造价低廉、取材方便的钢筋沥青隔震装置,并取得了一定的成效。前期钢筋沥青隔震技术主要应用于低矮砌体结构中,上部结构可以简化为刚体,研究结果表明该技术具有非常好的隔震效果,但是多高层建筑结构随高度增加而变柔,上部结构不能简单视为刚体。通过本文的研究,为钢筋沥青隔震技术在较柔的多高层结构中的推广和设计提供参考意见。从理论分析和钢框架—钢筋沥青隔震结构的振动台试验发现上部结构与隔震层的刚度比对隔震效果影响明显。借助ANSYS软件对试验模型进行时程分析,分析结果与试验结果非常吻合,该模型合理反映了隔震结构的隔震机理和动力响应,结果表明当刚度比大于2.5时,隔震效果显著。在此基础上,建立多层有限元足尺模型进行验证,再次验证了隔震后结构的基频明显减小,随着刚度比的增大,加速度幅值比逐渐减小的规律。本文提出刚度比的概念,将隔震效果与上部结构和隔震层的刚度比联系起来,能合理确定隔震结构的适用范围,应是隔震设计领域的重大创新。随着上部结构高度增加,上部荷载会有所增加,按照第二章计算的隔震层所需要的钢筋数量也会随之增多,即隔震层水平刚度增大,上部结构抗侧刚度与隔震层水平刚度之比下降,因此,为保证多高层钢筋沥青隔震结构的理想隔震效果,隔震层钢筋确定后对上部结构构件进行合理布置,使上部结构抗侧刚度与隔震层水平刚度之比尽可能大。
[Abstract]:With the rapid development of cities and towns, the height of the building structure is getting higher and higher, gradually from the low-rise building to the multi-high-rise building, especially in areas with weak seismic awareness.There is an urgent need for cheap and effective isolation devices and simple and practical design methods for isolated structures.After several years' hard work, our group has developed a kind of low cost and convenient steel bar asphalt isolation device, and has achieved certain results.The former reinforced asphalt isolation technology is mainly used in low masonry structure, and the superstructure can be simplified as rigid body. The research results show that the technology has a very good isolation effect, but the multi-high-rise building structure becomes flexible with the increase of height.The superstructure cannot simply be regarded as a rigid body.Through the research in this paper, the paper provides the reference for the popularization and design of the reinforced asphalt isolation technology in the softer multi-high-rise structures.From the theoretical analysis and shaking table test of steel frame-reinforced asphalt isolated structure, it is found that the stiffness ratio of the superstructure to the isolation layer has an obvious effect on the isolation effect.The time history analysis of the test model is carried out with the aid of ANSYS software. The analysis results are in good agreement with the experimental results. The model reasonably reflects the isolation mechanism and dynamic response of the isolated structure. The results show that the isolation effect is remarkable when the stiffness ratio is greater than 2.5.On this basis, the multi-story finite element full-scale model is established to verify the law that the fundamental frequency of the structure decreases obviously after the isolation, and the acceleration amplitude ratio decreases gradually with the increase of the stiffness ratio.In this paper, the concept of stiffness ratio is put forward, the isolation effect is connected with the stiffness ratio of the upper structure and the isolation layer, and the applicable range of the isolated structure can be reasonably determined, which should be an important innovation in the field of isolation design.With the increase of the height of the superstructure, the upper load will increase, and the amount of reinforcement needed for the isolation layer calculated according to the second chapter will also increase, that is, the horizontal stiffness of the isolation layer will increase.The ratio of lateral stiffness of superstructure to horizontal stiffness of isolation layer is decreased. Therefore, in order to ensure the ideal isolation effect of multi-story reinforced asphalt isolated structure, the reinforcement of isolation layer is reasonably arranged after the reinforcement is determined.The ratio of lateral stiffness of superstructure to horizontal stiffness of isolation layer is as large as possible.
【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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