调谐惯质阻尼器的动力性能及对连续梁桥减震性能研究

发布时间：2018-01-08 14:02

本文关键词：调谐惯质阻尼器的动力性能及对连续梁桥减震性能研究　出处：《北京交通大学》2016年硕士论文　论文类型：学位论文

更多相关文章： TVMD 连续梁桥 减震 H_2性能 参数优化

【摘要】：工程结构的防震减灾备受人们的重视。采用阻尼器作为耗能减震装置,并安装在工程结构的适当位置,通过增加结构阻尼的方式可有效减小结构在地震作用下的响应。本文针对一种新式被动阻尼器—调谐惯质阻尼器(TVMD),深入研究其耗能特性,并以连续梁桥为工程对象研究其参数优化和减震性能。主要研究工作如下：(1)进行了TVMD阻尼器单体性能分析,把TVMD的出力分为弹性力和阻尼力两部分,得出等效刚度系数和等效阻尼系数,并分析了其与阻尼器参数的关系；在单自由度系统基础上讨论了等效刚度与等效阻尼对隔震效果的影响,选取不同特性的地震波做位移及加速度反应谱曲线,通过TVMD安装前后反应谱曲线的变化情况阐明了对单自由度结构的高效减震性能。(2)建立了规则连续梁桥的两个自由度的简化分析模型。针对简化模型探讨TVMD的减震性能,分析阻尼器参数对目标响应的动力放大系数的影响规律,给出最优参数；探讨了强震作用下桥梁支座破坏所带来的响应突变以及TVMD对这种突变的控制作用；把三跨连续梁桥简化为多自由度精细模型,在横桥向和纵桥向分别进行TVMD优化设计,采用基于H2性能的梯度优化法优化TVMD参数,并与常见的粘滞阻尼器(VD)作对比,结果显示TVMD比VD具有更优越的减震效果。(3)以公路桥梁Benchmark问题为对象,考察TVMD的减震性能。经桥梁结构动力分析确定减震模态,分别在横桥向和纵桥向同步安装多个TVMD,并进行参数优化；选取多个评价指标,在多条双向地震波激励下全面考察TVMD的减震效果。结果表明,除了对加速度的控制效果略显不足外,TVMD对位移、墩底剪力等评价指标均有不同程度的减小效果；与VD阻尼器相比,TVMD对桥梁结构的减震更为高效。
[Abstract]:People pay more attention to the earthquake prevention and mitigation of engineering structure. The damper is used as the energy dissipation device and installed in the proper position of the engineering structure. By increasing the damping of the structure, the response of the structure to earthquake can be reduced effectively. In this paper, the energy dissipation characteristics of a new passive damp-tuned inertial mass damper (TVMD) are studied in depth. The parameter optimization and vibration absorption performance of continuous beam bridge are studied. The main research work is as follows: 1) the performance analysis of TVMD damper is carried out. The output force of TVMD is divided into two parts: elastic force and damping force. The equivalent stiffness coefficient and equivalent damping coefficient are obtained, and the relationship between them and the damper parameters is analyzed. On the basis of single degree of freedom system, the effects of equivalent stiffness and damping on the isolation effect are discussed, and the displacement and acceleration response spectra of seismic waves with different characteristics are selected. According to the change of response spectrum curve before and after installation of TVMD, the high-efficiency seismic absorption performance of single-degree-of-freedom structure is explained. A simplified analysis model of two degrees of freedom for regular continuous beam bridges is established, and the seismic absorption performance of TVMD is discussed according to the simplified model. The influence of damper parameters on the dynamic magnification factor of the target response is analyzed and the optimal parameters are given. The response mutation caused by the bridge bearing failure and the control effect of TVMD on the sudden change are discussed. The three-span continuous beam bridge is simplified as a multi-degree-of-freedom fine model. The TVMD optimization design is carried out in the transverse and longitudinal direction, and the TVMD parameters are optimized by the gradient optimization method based on the H _ 2 performance. Compared with the conventional viscous damper (VDs), the results show that TVMD has a better damping effect than VD) and takes the Benchmark problem of highway bridges as the object. The vibration absorption modes of TVMD are determined by dynamic analysis of bridge structure, and several TVMDs are installed synchronously in transverse and longitudinal bridges, and the parameters are optimized. Several evaluation indexes are selected to investigate the seismic damping effect of TVMD under the excitation of multiple two-way seismic waves. The results show that the displacement of TVMD is slightly inadequate except for the acceleration control effect. The evaluation indexes such as shearing at the bottom of the pier have different degree of reducing effect; Compared with VD dampers, TVMD is more efficient in reducing the vibration of bridge structures.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U442.55;U448.215

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