斜撑摩擦阻尼器对RC框架地震能量反应的影响研究

发布时间：2018-04-23 16:01

本文选题：框架结构 + 斜撑摩擦阻尼器　；参考：《长沙理工大学》2015年硕士论文

【摘要】：地震灾害给人类的经济生活带来不可估量的损失。摩擦耗能减震的思想受到国内外学者的广泛关注。对于斜撑摩擦阻尼器,在小震情况下,斜撑摩擦阻尼器的耗能支撑为框架结构提供了附加刚度使其本身不滑移;而在中、强震下,斜撑摩擦阻尼器产生一定的滑移,摩擦做功耗散能量,为结构提供附加阻尼,从而减小结构响应。本文从地震能量角度出发,分析斜撑摩擦阻尼器对RC框架地震能量反应的影响,并基于减震结构的能量反应变化规律,探讨确定最佳减震方案的方法。本文分析了罕遇地震作用下减震结构的能量反应指标,合理地控制斜撑摩擦阻尼器的各项指标可以在结构抗震设计中获得良好的效果。通过应用IDARC7.0软件进行建模、动力时程分析,计算出在罕遇地震下减震RC框架的结构损伤值,再针对地震能量输入与斜撑摩擦阻尼器耗散能量之间的关系进行对比分析,从而对斜撑摩擦阻尼器的主要控制参数;起滑位移比α和支撑刚度比β的最佳取值进行了具体量化,反应了减震RC框架结构的自振周期T、斜撑阻尼器与RC框架结构的起滑位移比α、刚度比β等因素对RC框架地震能量反应的影响。确定在给定减震结构自振周期T的情况下斜撑摩擦阻尼器的最优控制参数。从而使斜撑摩擦阻尼器在最优的控制参数下,能够实现在用最低的经济成本,发挥最有效的耗能作用的情况下,最大限度的保护框架主体结构免受地震力破坏。
[Abstract]:Earthquake disaster brings incalculable loss to human economic life. The idea of frictional energy dissipation is widely concerned by scholars at home and abroad. For inclined brace friction dampers, in the case of small earthquakes, the energy dissipation support of oblique brace friction dampers provide additional stiffness to the frame structure so that it does not slip itself, but under moderate and strong earthquakes, the inclined brace friction dampers produce certain slippage. Friction dissipates energy to provide additional damping for the structure, thus reducing the structural response. In this paper, from the angle of seismic energy, the influence of inclined braced friction dampers on the seismic energy response of RC frame is analyzed. Based on the variation law of energy response of RC frame, the method of determining the best seismic absorption scheme is discussed. In this paper, the energy response index of shock absorber structure under rare earthquake is analyzed, and good results can be obtained in the seismic design of structures by reasonably controlling the parameters of inclined braced friction dampers. By using IDARC7.0 software to model and dynamic time history analysis, the damage value of RC frame structure under rare earthquake is calculated, and the relationship between seismic energy input and dissipation energy of inclined brace friction damper is compared and analyzed. Thus, the main control parameters of inclined brace friction damper, the optimum value of slip displacement ratio 伪 and bracing stiffness ratio 尾 are quantified. The effects of the natural vibration period T of RC frame structure, the ratio of slip displacement 伪 and stiffness ratio of inclined braced damper to RC frame structure on the seismic energy response of RC frame structure are studied. The optimal control parameters of inclined braced friction dampers are determined under the given natural vibration period T. Thus, under the optimal control parameters, the inclined brace friction damper can protect the main structure of the frame from seismic damage at the lowest economic cost and the most effective energy dissipation.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375.4;TU352.1

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