带刚性伸臂减震层高层结构抗震性能分析与对比

发布时间：2018-04-21 03:27

本文选题：黏滞阻尼器 + 刚性伸臂　；参考：《湖南大学》2015年硕士论文

【摘要】：黏滞阻尼器作为一种被动耗能装置,因其易操作性和高可靠性广受工程技术人员的好评,在各类多高层结构中应用广泛,但其减震性能的发挥依赖于结构的层间位移,而高层结构整体刚度大、层间位移限值小,采用普通的黏滞阻尼器布置方式减震效果较差。Jeremlah在06年提出了带刚性伸臂减震层高层结构的减震理念,具有在阻尼器两端放大层间位移的效果,其减震性能较好,但此类结构的相关研究还比较少,本文在总结和吸收国内外研究成果的基础上,对该种具有放大层间位移效果的黏滞阻尼器布置形式进行深入的研究与分析,得到一些对设计有益的结论。具体内容如下:(1)本文通过推导黏滞阻尼器的单周简谐振动耗能能力公式得到黏滞阻尼器在高层建筑中合适的参数设置范围。(2)通过推导三角形形式钢管伸臂对有效层间位移的放大公式,得到了带刚性伸臂减震层高层结构中黏滞阻尼器的模态附加阻尼比计算公式。结果表明:带刚性伸臂减震高层结构抗震性能的提高与剪力墙到外框柱轴线间的距离成正比,与层高成反比,与阻尼器竖向夹角的余弦相关。(3)假定总阻尼系数和单个阻尼器的其他参数不变,比较设置1-4道刚性伸臂减震层时结构的性能差异,可知对于多道减震层结构其单个性能指标虽不是最好,但综合性能更好。(4)假定单个阻尼器其他参数不变时,通过变化结构总阻尼系数,得知带刚性伸臂减震层高层结构辐射阻尼器存在最优总阻尼系数(即最优附加阻尼比),通过对相应内力和位移规律的总结,得到结构合理总阻尼系数的选取规则,由此可知,附加阻尼比大小而非减震层数量才是决定此类减震结构抗震性能的关键。(5)以一个框架-核心筒结构为例,对其分别设置刚性伸臂减震层、对角支撑减震层及加强层在近场脉冲波和非脉冲波作用下的抗震性能进行了对比与分析。结果表明:带刚性伸臂减震层高层结构的抗震性能在三类结构中是最为优越的,而脉冲波则会导致层间位移等性能指标大幅增加,设计时不容忽视。
[Abstract]:As a passive energy dissipation device, viscous damper is widely used in various kinds of high-rise structures because of its ease of operation and high reliability. However, the performance of viscous damper depends on the interstory displacement of the structure. However, the overall stiffness of the high-rise structure is large and the limit value of the interstory displacement is small. In 2006, the idea of reducing the vibration of the high-rise structure with rigid cantilever damping layer is put forward by using the ordinary viscous damper arrangement. It has the effect of amplifying the interlayer displacement at the two ends of the damper, and its damping performance is better, but the research of this kind of structure is still relatively few. This paper summarizes and absorbs the research results at home and abroad. The layout of the viscous damper with the effect of magnifying the displacement between the layers is studied and analyzed in depth, and some useful conclusions are obtained. The main contents are as follows: (1) in this paper, by deducing the energy dissipation capacity formula of single cycle harmonic vibration of viscous dampers, the appropriate parameter setting range of viscous dampers in high-rise buildings is obtained. The amplification formula of interstory displacement, The formula for calculating the modal additional damping ratio of viscous dampers in tall structures with rigid cantilever damping layer is obtained. The results show that the improvement of seismic performance of high-rise structures with rigid cantilever is proportional to the distance between shear wall and outer frame column axis, and inversely proportional to Gao Cheng. On the assumption that the total damping coefficient and other parameters of a single damper are invariant, the performance differences of the structure with 1-4 rigid cantilever damping layers are compared. It is known that the single performance index is not the best, but the comprehensive performance is better for the multi-channel damping layer structure, assuming that the other parameters of the single damper are invariant, the total damping coefficient of the structure is changed by changing the total damping coefficient of the structure. It is known that there is an optimal total damping coefficient (that is, the optimal additional damping ratio) in the radiation dampers of high-rise structures with rigid cantilever dampers. By summarizing the corresponding internal forces and displacement laws, the selection rules of the reasonable total damping coefficients of the structures are obtained. The magnitude of additional damping ratio rather than the number of damping layers is the key to determine the seismic performance of this kind of structure. The seismic behavior of diagonal braced damping layer and strengthened layer under the action of near-field pulse wave and non-pulse wave is compared and analyzed. The results show that the seismic performance of high-rise structures with rigid cantilever damping layer is the best among the three kinds of structures, while the pulse wave will lead to a large increase in the performance indexes such as interstory displacement, which can not be ignored in the design.
【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】：TU973.31

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