本文選題：大跨徑自錨式懸索橋　切入點：動力特性　出處：《武漢理工大學》2014年碩士論文

【摘要】：自錨式懸索橋作為一種新穎的橋梁結(jié)構(gòu)，因其造型美觀、選址靈活以及經(jīng)濟效益好而越來越受到青睞，已成為中小橋跨結(jié)構(gòu)中極具競爭力的方案之一。從既有的研究資料來看，自錨式懸索橋雖然應用廣泛，但因其結(jié)構(gòu)復雜，設(shè)計、施工理論仍需進一步完善。本文以主跨406m的桃花峪黃河特大橋主橋為工程背景，，對大跨徑自錨式懸索橋的動力特性及地震響應進行了系統(tǒng)的分析研究，主要內(nèi)容如下： (1)論述了大跨徑自錨式懸索橋地震響應的分析方法，并對各種地震響應的計算方法進行了評價； (2)利用Midas/civil2012建立空間有限元模型，對大跨徑自錨式懸索橋的動力特性進行了分析，并研究了矢跨比、恒載集度和結(jié)構(gòu)剛度等參數(shù)的變化對橋梁結(jié)構(gòu)成橋狀態(tài)動力特性的影響。 (3)根據(jù)場地設(shè)計反應譜，按照兩水準抗震設(shè)防目標的要求，在兩種概率水準(El、E2)的地震動作用下，采用反應譜法分析了桃花峪黃河大橋主橋（無樁計算模型）在縱向、橫向、豎向以及兩種組合地震動作用下橋梁結(jié)構(gòu)的地震響應。 (4)采用改進的El-Centro波作為地震動輸入對桃花峪黃河大橋主橋（無樁模型）進行了一致激勵下地震響應的動態(tài)時程分析，并與反應譜法的計算結(jié)果進行對比分析，探討了反應譜法在大跨度自錨式懸索橋抗震分析中的局限性；并且研究了在多點激勵下，行波效應對大跨徑自錨式懸索橋地震響應的影響。
[Abstract]:As a novel bridge structure, self-anchored suspension bridge is more and more popular because of its beautiful shape, flexible location and good economic benefit. It has become one of the most competitive schemes in medium and small span structures. Although self-anchored suspension bridge is widely used, because of its complex structure and design, the construction theory still needs to be further improved. This paper takes the main bridge of Taohuayu Yellow River Bridge with the main span of 406m as the engineering background. The dynamic characteristics and seismic response of long-span self-anchored suspension bridge are systematically analyzed and studied. The main contents are as follows:. 1) the seismic response analysis method of long span self-anchored suspension bridge is discussed, and the calculation methods of seismic response are evaluated. 2) the dynamic characteristics of long-span self-anchored suspension bridges are analyzed by using the spatial finite element model established by Midas/civil2012, and the influence of the parameters such as the ratio of vector to span, the density of dead load and the stiffness of the structure on the dynamic characteristics of the bridge is studied. 3) according to the site design response spectrum and according to the requirements of the two level seismic fortification targets, under the ground motion action of two probabilistic leveling, the longitudinal and lateral direction of the main bridge (without pile calculation model) of Taohuayu Yellow River Bridge is analyzed by using the response spectrum method. Seismic response of bridge structure under vertical and combined ground motion. 4) dynamic time history analysis of seismic response of the main bridge of Taohuayu Yellow River Bridge (without pile model) under uniform excitation is carried out by using improved El-Centro wave as ground motion input, and the results are compared with the calculated results of response spectrum method. The limitation of response spectrum method in seismic analysis of long-span self-anchored suspension bridge is discussed, and the effect of traveling wave effect on seismic response of long-span self-anchored suspension bridge under multi-point excitation is studied.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.55;U448.25

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