设置粘滞阻尼器的连续梁桥地震响应及加固研究
发布时间：2019-03-22 06:52
【摘要】：近些年来由于地震、海啸、台风等特大自然灾害的频繁发生,已经给世界人民带来巨大的生命和财产损失,提高现有基础设施以及土木工程行业的建筑物整体的抗震、抗风性能已经成为一个很重要的研究方向。桥梁是公路、铁路和城市道路网中特别重要的组成部分之一。作为主要自然灾害的风灾、震灾和洪灾对桥梁结构的破坏作用,越来越引起人们的重视。由于这些原因,国内外的许多建筑土木领域的专家学者们渐渐都开始了这方面的研究,以基础减隔震、消能减振以及主动、智能的振动控制为主要研究内容的课题有了飞速的发展。这些当中,阻尼器最受人们的青睐,而阻尼器当中研究最多使用最普遍的是液体粘滞阻尼器,这是因为它的产品技术成熟、装置性能稳定,安装到建筑结构上以后可以保证正常工作很长时间。在过去的这二十多年里,世界的很多地方已经有400多个桥梁和建筑结构成功的安装使用上了液体粘滞阻尼器。 本文首先对粘滞阻尼器的力学特性、内部构造工作原理进行综述和介绍,接着对设置液体粘滞阻尼器的桥梁结构的地震响应分析模型和动力方程作了详细的介绍。本论文以甘肃省某高速公路一连续梁桥为工程背景,运用Midas Civil建立有限元分析模型,运用非线性动力时程分析方法分析地震动响应；并且对不同的阻尼器参数组合和布置方案进行比较分析,并将阻尼器用于加固改造体系,应用在实际的工程中进行分析论证。本文的内容主要有三个部分： 一、阐述了结构保护系统的内容、意义,以及体系的阻尼和能量分配；介绍了粘滞阻尼器的基本理论、构造特点、布置理论分析模型以及优化布置和参数影响；陈述了设置粘滞阻尼器的桥梁结构的抗震计算方法,详细的介绍了三种常用方法和推导计算过程。 二、结合实际的工程背景,在设置粘滞阻尼器后通过采用不同的阻尼系数组合工况对受到地震波作用的桥梁结构,对其墩底内力和梁端位移进行分析比对,得出本文当中实际的桥梁工程案例设置粘滞阻尼器的最优阻尼系数,分析比较设置阻尼器前后的减振效果。 三、结合工程实例,对现有桥梁进行抗震加固改造研究。列举通常采用的抗震加固方法进行论述比较,并通过计算模型分析验证,对设置阻尼器的不同方案进行加固抗震能力分析,进一步认识了粘滞阻尼器加固方案的优越性。
[Abstract]:In recent years, due to the frequent occurrence of major natural disasters such as earthquakes, tsunamis and typhoons, it has brought enormous loss of life and property to the people of the world, and improved the earthquake resistance of existing infrastructure and the whole building of the civil engineering industry. Wind resistance has become an important research direction. Bridges are one of the most important components of road, rail and urban road networks. As the main natural disaster, wind disaster, earthquake disaster and flood disaster damage the bridge structure, people pay more and more attention to it. As a result of these reasons, many experts and scholars in the civil engineering field at home and abroad have gradually begun to study this field in order to reduce and isolate earthquakes, dissipate energy and reduce vibration as well as take the initiative. Intelligent vibration control is the main research content of the subject has been rapid development. Among these dampers, the most popular among them is the liquid viscous damper, which is the most commonly used in the study of dampers. This is because its products are mature in technology and the performance of the device is stable. After installation on the building structure, it can be guaranteed to work normally for a long time. Over the past two decades, more than 400 bridges and building structures have been successfully installed with liquid viscous dampers in many parts of the world. In this paper, the mechanical characteristics of viscous dampers and the working principle of internal structures are summarized and introduced, and then the seismic response analysis models and dynamic equations of bridge structures with liquid viscous dampers are introduced in detail. Based on the engineering background of a continuous beam bridge of a highway in Gansu province, the finite element analysis model is established by using Midas Civil, and the response of ground motion is analyzed by nonlinear time history analysis method. The parameters combination and arrangement of dampers are compared and analyzed, and the dampers are used to strengthen the retrofit system, and are applied to the practical engineering analysis and argumentation. The main contents of this paper are as follows: first, the content, significance, damping and energy distribution of the structural protection system are expounded. In this paper, the basic theory of viscous dampers, the characteristics of structures, the analytical model of layout theory and the influence of optimal layout and parameters are introduced. The seismic calculation methods of bridge structures with viscous dampers are presented. Three commonly used methods and derivation procedures are introduced in detail. Secondly, combined with the actual engineering background, the internal force of the pier bottom and the displacement of the beam end are analyzed and compared by adopting different damping coefficient combination conditions to the bridge structure subjected to seismic wave after setting up viscous dampers. The optimal damping coefficient of viscous dampers is obtained in the actual case of bridge engineering in this paper, and the damping effects before and after the dampers are analyzed and compared. Third, combining with engineering examples, the seismic reinforcement of existing bridges is studied. The seismic strengthening methods commonly used are discussed and compared, and the seismic capacity of different schemes with dampers is analyzed through the analysis of computational model. The superiority of the strengthening scheme with viscous dampers is further recognized.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.215
本文编号：2445365
[Abstract]:In recent years, due to the frequent occurrence of major natural disasters such as earthquakes, tsunamis and typhoons, it has brought enormous loss of life and property to the people of the world, and improved the earthquake resistance of existing infrastructure and the whole building of the civil engineering industry. Wind resistance has become an important research direction. Bridges are one of the most important components of road, rail and urban road networks. As the main natural disaster, wind disaster, earthquake disaster and flood disaster damage the bridge structure, people pay more and more attention to it. As a result of these reasons, many experts and scholars in the civil engineering field at home and abroad have gradually begun to study this field in order to reduce and isolate earthquakes, dissipate energy and reduce vibration as well as take the initiative. Intelligent vibration control is the main research content of the subject has been rapid development. Among these dampers, the most popular among them is the liquid viscous damper, which is the most commonly used in the study of dampers. This is because its products are mature in technology and the performance of the device is stable. After installation on the building structure, it can be guaranteed to work normally for a long time. Over the past two decades, more than 400 bridges and building structures have been successfully installed with liquid viscous dampers in many parts of the world. In this paper, the mechanical characteristics of viscous dampers and the working principle of internal structures are summarized and introduced, and then the seismic response analysis models and dynamic equations of bridge structures with liquid viscous dampers are introduced in detail. Based on the engineering background of a continuous beam bridge of a highway in Gansu province, the finite element analysis model is established by using Midas Civil, and the response of ground motion is analyzed by nonlinear time history analysis method. The parameters combination and arrangement of dampers are compared and analyzed, and the dampers are used to strengthen the retrofit system, and are applied to the practical engineering analysis and argumentation. The main contents of this paper are as follows: first, the content, significance, damping and energy distribution of the structural protection system are expounded. In this paper, the basic theory of viscous dampers, the characteristics of structures, the analytical model of layout theory and the influence of optimal layout and parameters are introduced. The seismic calculation methods of bridge structures with viscous dampers are presented. Three commonly used methods and derivation procedures are introduced in detail. Secondly, combined with the actual engineering background, the internal force of the pier bottom and the displacement of the beam end are analyzed and compared by adopting different damping coefficient combination conditions to the bridge structure subjected to seismic wave after setting up viscous dampers. The optimal damping coefficient of viscous dampers is obtained in the actual case of bridge engineering in this paper, and the damping effects before and after the dampers are analyzed and compared. Third, combining with engineering examples, the seismic reinforcement of existing bridges is studied. The seismic strengthening methods commonly used are discussed and compared, and the seismic capacity of different schemes with dampers is analyzed through the analysis of computational model. The superiority of the strengthening scheme with viscous dampers is further recognized.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.215
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