發(fā)布時(shí)間：2019-03-22 06:52

【摘要】：近些年來(lái)由于地震、海嘯、臺(tái)風(fēng)等特大自然災(zāi)害的頻繁發(fā)生,已經(jīng)給世界人民帶來(lái)巨大的生命和財(cái)產(chǎn)損失,提高現(xiàn)有基礎(chǔ)設(shè)施以及土木工程行業(yè)的建筑物整體的抗震、抗風(fēng)性能已經(jīng)成為一個(gè)很重要的研究方向。橋梁是公路、鐵路和城市道路網(wǎng)中特別重要的組成部分之一。作為主要自然災(zāi)害的風(fēng)災(zāi)、震災(zāi)和洪災(zāi)對(duì)橋梁結(jié)構(gòu)的破壞作用,越來(lái)越引起人們的重視。由于這些原因,國(guó)內(nèi)外的許多建筑土木領(lǐng)域的專家學(xué)者們漸漸都開始了這方面的研究,以基礎(chǔ)減隔震、消能減振以及主動(dòng)、智能的振動(dòng)控制為主要研究?jī)?nèi)容的課題有了飛速的發(fā)展。這些當(dāng)中,阻尼器最受人們的青睞,而阻尼器當(dāng)中研究最多使用最普遍的是液體粘滯阻尼器,這是因?yàn)樗漠a(chǎn)品技術(shù)成熟、裝置性能穩(wěn)定,安裝到建筑結(jié)構(gòu)上以后可以保證正常工作很長(zhǎng)時(shí)間。在過(guò)去的這二十多年里,世界的很多地方已經(jīng)有400多個(gè)橋梁和建筑結(jié)構(gòu)成功的安裝使用上了液體粘滯阻尼器。 本文首先對(duì)粘滯阻尼器的力學(xué)特性、內(nèi)部構(gòu)造工作原理進(jìn)行綜述和介紹,接著對(duì)設(shè)置液體粘滯阻尼器的橋梁結(jié)構(gòu)的地震響應(yīng)分析模型和動(dòng)力方程作了詳細(xì)的介紹。本論文以甘肅省某高速公路一連續(xù)梁橋?yàn)楣こ瘫尘?運(yùn)用Midas Civil建立有限元分析模型,運(yùn)用非線性動(dòng)力時(shí)程分析方法分析地震動(dòng)響應(yīng)；并且對(duì)不同的阻尼器參數(shù)組合和布置方案進(jìn)行比較分析,并將阻尼器用于加固改造體系,應(yīng)用在實(shí)際的工程中進(jìn)行分析論證。本文的內(nèi)容主要有三個(gè)部分： 一、闡述了結(jié)構(gòu)保護(hù)系統(tǒng)的內(nèi)容、意義,以及體系的阻尼和能量分配；介紹了粘滯阻尼器的基本理論、構(gòu)造特點(diǎn)、布置理論分析模型以及優(yōu)化布置和參數(shù)影響；陳述了設(shè)置粘滯阻尼器的橋梁結(jié)構(gòu)的抗震計(jì)算方法,詳細(xì)的介紹了三種常用方法和推導(dǎo)計(jì)算過(guò)程。 二、結(jié)合實(shí)際的工程背景,在設(shè)置粘滯阻尼器后通過(guò)采用不同的阻尼系數(shù)組合工況對(duì)受到地震波作用的橋梁結(jié)構(gòu),對(duì)其墩底內(nèi)力和梁端位移進(jìn)行分析比對(duì),得出本文當(dāng)中實(shí)際的橋梁工程案例設(shè)置粘滯阻尼器的最優(yōu)阻尼系數(shù),分析比較設(shè)置阻尼器前后的減振效果。 三、結(jié)合工程實(shí)例,對(duì)現(xiàn)有橋梁進(jìn)行抗震加固改造研究。列舉通常采用的抗震加固方法進(jìn)行論述比較,并通過(guò)計(jì)算模型分析驗(yàn)證,對(duì)設(shè)置阻尼器的不同方案進(jìn)行加固抗震能力分析,進(jìn)一步認(rèn)識(shí)了粘滯阻尼器加固方案的優(yōu)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.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.55;U448.215

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本文編號(hào)：2445365