惯质类调谐阻尼器对连续梁桥减震参数分析及性能研究

发布时间：2018-07-09 14:20

本文选题：TID + TVMD　；参考：《北京交通大学》2017年硕士论文

【摘要】：桥梁作为生命线工程的关键节点,一旦发生地震破坏将会带来巨大的社会危害。在实际工程中,常通过采用阻尼器装置吸收、耗散传递到主结构上的地震能量,进而实现桥梁减震的目的。惯质类调谐阻尼器(TIBD)是一类可以将装置实际质量放大千倍,利用惯性力和调谐效应来实现桥梁减震的新型阻尼器装置,调谐粘滞质量阻尼器(TVMD)和调谐惯质阻尼器(TID)均属于该类新型阻尼器装置。本文将以连续梁桥作为研究对象,分析上述两种TIBD装置的参数优化及减震性能,主要内容如下:(1)在已有连续梁桥建模方法的基础上,将一座典型3跨连续梁桥简化为双自由度简化模型和多自由度精细模型两种不同精度的减震分析模型,为研究两种TIBD装置(TVMD、TID)对连续梁桥的减震性能提供模型基础。以单自由度结构为分析模型,分析了 TVMD、TID的高效减震机理,将TIBD装置的出力分为弹性力、阻尼力两部分,并推导出两种装置弹性、阻尼出力时等效刚度和等效阻尼的计算公式。对比分析了 TVMD、TID的等效弹性力、等效阻尼力对减震性能的影响。(2)从双自由度简化模型入手,以从外激励输入到结构关键响应的动力放大系数为评价指标对阻尼器参数进行优化设计,分析研究了主结构、阻尼器参数对减震性能的影响。然后从多自由度精细模型出发,基于顺桥向、横桥向两种减震分析的典型状态,采用基于H2性能的梯度法对阻尼器参数进行优化设计,并与传统粘滞阻尼器的减震性能进行对比,研究TIBD装置对于连续梁桥多阶模态减震的高效性。研究表明,两种TIBD装置可实现对连续梁桥单阶、多阶模态响应的显著减震效果。(3)考虑阻尼器减震性能会受结构动力特性的影响,分别建立墩高、跨径不同的连续梁桥精细模型,分析墩高、跨径等结构因素对TIBD装置高效减震性能的影响,研究表明,TIBD装置对不同动力特性的连续梁桥均具有较好的减震效果,但减震性能会随墩高、跨径的增加而有所降低。最后建立一座典型5跨连续梁桥多自由度精细模型分析两种TIBD装置的减震性能,研究表明TIBD装置对于5跨5连续梁桥同样具有高效减震性能。
[Abstract]:Bridge as the key node of lifeline engineering, once the earthquake damage will bring huge social harm. In practical engineering, the seismic energy transmitted to the main structure is often absorbed and dissipated by means of dampers, and then the purpose of bridge damping is realized. Inertial tuned damper (TIBD) is a new type of damper which can amplify the actual mass of the device by thousands of times and use inertial force and tuning effect to achieve bridge vibration absorption. Tuned viscous mass dampers (TVMD) and tuned inertial mass dampers (TID) belong to these new dampers. In this paper, continuous beam bridge is taken as the research object to analyze the parameter optimization and vibration absorption performance of the two TIBD devices. The main contents are as follows: (1) based on the existing modeling methods of continuous beam bridge, A typical 3-span continuous beam bridge is simplified into two kinds of vibration absorption analysis models with different precision, namely the simplified model of two degrees of freedom and the fine model of multiple degrees of freedom, which provides a model basis for studying the seismic absorption performance of two TIBD devices (TVMD-TID) for continuous beam bridges. Taking the single degree of freedom structure as an analytical model, the mechanism of high efficiency vibration absorption of TVMD-TID is analyzed. The output force of TIBD device is divided into two parts: elastic force and damping force, and the formulas for calculating the elasticity, equivalent stiffness and equivalent damping of the two devices are derived. The effects of the equivalent elastic force and the equivalent damping force on the damping performance of TID are compared and analyzed. (2) starting with the simplified model of two degrees of freedom, The dynamic magnification factor from the external excitation input to the key response of the structure is taken as the evaluation index to optimize the design of the damper parameters. The influence of the main structure and the damper parameters on the damping performance is analyzed and studied. Then based on the multi-degree-of-freedom fine model, based on the typical state of two kinds of vibration absorption analysis, the H _ 2 performance gradient method is used to optimize the design of damper parameters. Compared with the traditional viscous dampers, the high efficiency of TIBD device for multi-mode vibration absorption of continuous beam bridges is studied. The results show that the two TIBD devices can achieve significant seismic absorption effects on single and multi-order modal responses of continuous beam bridges. (3) considering that the damping performance of dampers will be affected by the dynamic characteristics of the structure, the fine models of continuous beam bridges with different spans and piers are established, respectively. The influence of structural factors such as pier height and span on the seismic performance of TIBD device is analyzed. The results show that the TIBD device has better seismic absorption effect on continuous beam bridges with different dynamic characteristics, but the seismic absorption performance will decrease with the increase of pier height and span. Finally, a multi-degree-of-freedom fine model of a typical 5-span continuous beam bridge is established to analyze the vibration absorption performance of two TIBD devices. The results show that the TIBD device has the same high performance for the 5-span continuous beam bridge.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55

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