桥梁粘滞阻尼器关键参数研究与优化设计
发布时间：2018-10-30 18:05
【摘要】：我国是一个地震多发的国家,大面积的国土处于强震频发的地带,因此抗震是工程领域非常重要的问题。减隔震技术在桥梁工程抗震领域应用越来越广泛,粘滞阻尼器以其良好的抗震性能及适用性成为大跨度桥梁控制地震响应的较好选择。论文介绍了粘滞阻尼器的分类,各类粘滞阻尼器的特点及其耗能原理,分析粘滞阻尼器的恢复力模型,并讨论了设置粘滞阻尼器的桥梁结构抗震理论分析方法。根据简化的非线性Maxwell模型,确定粘滞阻尼器的关键参数研究对象为阻尼系数C。传统的参数敏感分析法能够有效地得到桥梁粘滞阻尼器的最优参数组合,但存在计算及数据处理工作量大、耗时长、效率低下等问题。因此论文采用随机振动理论,得到单自由度振动系统最优阻尼比及其对应的阻尼系数理论公式,采用能量等效理论,进一步得到非线性粘滞阻尼器的最优阻尼系数的表达式。以某连续梁桥为工程实例,采用有限元分析软件MIDAS/CIVIL 2013建立其有限元模型,分析动力特性,计算得到优化阻尼系数。采用非线性时程分析法,验证基于随机振动理论粘滞阻尼器参数优化方法的正确性。对论文所研究的粘滞阻尼器优化设计,从结构设计、粘滞介质和密封三个方面来进行探讨,分别提出优化建议。
[Abstract]:China is an earthquake-prone country, and a large area of land is in the area of frequent strong earthquakes, so aseismic is a very important problem in the field of engineering. Seismic isolation technology is more and more widely used in the seismic field of bridge engineering. Viscous damper has become a better choice for controlling seismic response of long-span bridges because of its good seismic performance and applicability. This paper introduces the classification of viscous dampers, the characteristics of all kinds of viscous dampers and their energy dissipation principles, analyzes the restoring force model of viscous dampers, and discusses the seismic theoretical analysis method of bridge structures with viscous dampers. According to the simplified nonlinear Maxwell model, the key parameter of viscous damper is the damping coefficient C. The traditional parametric sensitivity analysis method can effectively get the optimal parameter combination of bridge viscous dampers, but there are some problems such as large amount of calculation and data processing, long time consumption, low efficiency and so on. In this paper, the optimal damping ratio of single degree of freedom vibration system and the corresponding theoretical formula of damping coefficient are obtained by using random vibration theory, and the expression of optimal damping coefficient of nonlinear viscous damper is obtained by using the energy equivalent theory. Taking a continuous beam bridge as an engineering example, the finite element model of a continuous beam bridge is established by using the finite element analysis software MIDAS/CIVIL 2013. The dynamic characteristics are analyzed and the optimum damping coefficient is calculated. The nonlinear time-history analysis method is used to verify the correctness of the parameter optimization method based on random vibration theory for viscous dampers. The optimization design of viscous damper studied in this paper is discussed from three aspects: structure design, viscous medium and seal.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
本文编号：2300764
[Abstract]:China is an earthquake-prone country, and a large area of land is in the area of frequent strong earthquakes, so aseismic is a very important problem in the field of engineering. Seismic isolation technology is more and more widely used in the seismic field of bridge engineering. Viscous damper has become a better choice for controlling seismic response of long-span bridges because of its good seismic performance and applicability. This paper introduces the classification of viscous dampers, the characteristics of all kinds of viscous dampers and their energy dissipation principles, analyzes the restoring force model of viscous dampers, and discusses the seismic theoretical analysis method of bridge structures with viscous dampers. According to the simplified nonlinear Maxwell model, the key parameter of viscous damper is the damping coefficient C. The traditional parametric sensitivity analysis method can effectively get the optimal parameter combination of bridge viscous dampers, but there are some problems such as large amount of calculation and data processing, long time consumption, low efficiency and so on. In this paper, the optimal damping ratio of single degree of freedom vibration system and the corresponding theoretical formula of damping coefficient are obtained by using random vibration theory, and the expression of optimal damping coefficient of nonlinear viscous damper is obtained by using the energy equivalent theory. Taking a continuous beam bridge as an engineering example, the finite element model of a continuous beam bridge is established by using the finite element analysis software MIDAS/CIVIL 2013. The dynamic characteristics are analyzed and the optimum damping coefficient is calculated. The nonlinear time-history analysis method is used to verify the correctness of the parameter optimization method based on random vibration theory for viscous dampers. The optimization design of viscous damper studied in this paper is discussed from three aspects: structure design, viscous medium and seal.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
【参考文献】
相关期刊论文 前1条
1 李宏男,阎石;中国结构控制的研究与应用[J];地震工程与工程振动;1999年01期
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