【摘要】：大跨度斜拉橋是交通工程的重要樞紐,也是生命線工程,一旦地震作用破壞了橋梁,抗震救災(zāi)工作將被嚴(yán)重的影響。而且我國又是地震多發(fā)國家,因此,全面、系統(tǒng)的研究斜拉橋的抗震性能是刻不容緩的。本文以主跨為鋼箱梁的單塔斜拉橋為研究對象,對斜拉橋的自振特性進(jìn)行了分析,對粘滯阻尼器的減震性能以及斜拉橋的主梁與橋臺地震耦合關(guān)系進(jìn)行了研究,主要工作包括以下幾個方面:(1)總結(jié)國內(nèi)外對結(jié)構(gòu)振動控制的研究理論,介紹被動控制用的各種阻尼器及其耗能原理,其中重點介紹了阻尼器參數(shù)在實驗室的調(diào)節(jié)方法。(2)運用有限元軟件,對斜拉橋的各個組成部分(如斜拉索、橋塔、主梁橋墩、樁基礎(chǔ)和支座等)采用合理的方式進(jìn)行模擬,建立了有、無阻尼器的斜拉橋模型,對無阻尼器的斜拉橋的自振特性進(jìn)行分析。(3)對有阻尼器和無阻尼器兩個斜拉橋模型進(jìn)行非線性時程分析,通過選取不同的粘滯阻尼器參數(shù),分析比較斜拉橋在地震波三向輸入下的橋塔和主梁位移、塔底彎矩和剪力,經(jīng)過比選,得到一組最合理的阻尼參數(shù),確定為阻尼器的設(shè)計參數(shù)。(4)在EI Centro Site地震波作用下,對斜拉橋的主梁與橋臺進(jìn)行碰撞分析。在設(shè)置具有最優(yōu)阻尼參數(shù)的粘滯阻尼器作用下,分析主梁與橋臺的碰撞耦合性,研究阻尼器對主梁與橋臺之間碰撞的影響。
[Abstract]:Long-span cable-stayed bridge is an important hub of traffic engineering and also a lifeline project. Once the bridge is damaged by earthquake, the earthquake relief work will be seriously affected. Since China is an earthquake-prone country, it is urgent to study the seismic behavior of cable-stayed bridges in a comprehensive and systematic way. In this paper, the self-vibration characteristics of cable-stayed bridge with single tower cable-stayed bridge with main span as steel box girder are analyzed, and the damping performance of viscous damper and the seismic coupling relationship between main girder and abutment of cable-stayed bridge are studied. The main work includes the following aspects: (1) summing up the research theories of structural vibration control at home and abroad, introducing various dampers and their energy dissipation principles used in passive control. The adjustment method of damper parameters in laboratory is introduced emphatically. (2) various components of cable-stayed bridge (such as cable-stayed cable, bridge tower, pier of main beam, pile foundation and support etc.) are simulated by using finite element software. A cable-stayed bridge model with and without dampers is established, and the natural vibration characteristics of cable-stayed bridges without dampers are analyzed. (3) nonlinear time-history analysis of two cable-stayed bridge models with and without dampers is carried out, and different viscous damper parameters are selected. This paper analyzes and compares the displacement of tower and main beam, the bending moment and shear force of tower bottom of cable-stayed bridge under the three-direction input of seismic wave. Through comparison and selection, a group of most reasonable damping parameters are obtained, which are determined as the design parameters of damper. (4) under the action of EI Centro Site seismic wave, Collision analysis of main girder and abutment of cable-stayed bridge is carried out. Under the action of viscous dampers with optimal damping parameters, the collision coupling between girder and abutment is analyzed, and the effect of dampers on the collision between girder and abutment is studied.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.55;U448.27

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 李波;大跨度斜拉橋抗震性能及兩種減震措施的研究[D];湖南大學(xué);2008年

，

本文編號：2170675