本文關(guān)鍵詞：混合梁矮塔斜拉橋設(shè)計與施工若干關(guān)鍵問題研究　出處：《長沙理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 混合梁矮塔斜拉橋 索梁活載比 靜力分析 參數(shù)分析 有限元 鋼箱梁施工 施工方案 索梁錨固區(qū)

【摘要】：矮塔斜拉橋是介于傳統(tǒng)斜拉橋和連續(xù)梁橋或連續(xù)剛構(gòu)橋之間的一種綜合兩者優(yōu)勢的橋梁結(jié)構(gòu)形式。它具有斜拉橋的樣式,但在結(jié)構(gòu)受力特性、結(jié)構(gòu)尺寸比例和斜拉索布置上,又與傳統(tǒng)斜拉橋有一定的差別。目前剛性梁矮塔斜拉橋修建得較多,但梁高尺寸更小、主梁更加輕柔的柔性梁矮塔斜拉橋,更容易與環(huán)境相協(xié)調(diào),更受人們青睞,更具有發(fā)展前景和推廣意義。為此本文以世界上最大跨徑混合梁矮塔斜拉橋——廣東省潮惠高速公路榕江大橋為工程背景,圍繞混合梁矮塔斜拉橋的界定、結(jié)構(gòu)受力特性、結(jié)構(gòu)參數(shù)分析、主梁施工方案和索梁錨固區(qū)應(yīng)力分析展開了一系列的研究工作,結(jié)合Matlab符號計算功能推導(dǎo)了方便界定混合梁矮塔斜拉橋的結(jié)構(gòu)特征參數(shù)計算公式,通過Midas/Civil有限元軟件建立了考慮全橋施工全過程有限元仿真模型和結(jié)構(gòu)參數(shù)分析模型,利用FBR_CAL_SUO有限元軟件論證并比較了榕江大橋次邊跨鋼箱梁的施工方案,運用Midas/FEA對索梁錨固區(qū)進行了局部應(yīng)力分析。本文主要研究內(nèi)容如下:(1)文中簡述了矮塔斜拉橋的發(fā)展?fàn)顩r,分析了混合梁矮塔斜拉橋的研究動態(tài),提出了混合梁矮塔斜拉橋索梁活載比作為反映結(jié)構(gòu)本質(zhì)特征的重要評判指標,運用比擬梁等效的思路和Matlab符號計算功能推導(dǎo)了不同邊界條件以及不同鋼混主梁布置形式的混合梁矮塔斜拉橋索梁活載比計算公式,并分析了其與結(jié)構(gòu)參數(shù)的關(guān)系。(2)根據(jù)多座實橋的統(tǒng)計對比分析,提出了具體的數(shù)值指標作為界定混合梁矮塔斜拉橋的分界點。索梁活載比小于0.5時為剛性梁矮塔斜拉橋,大于0.5時為柔性梁矮塔斜拉橋或者傳統(tǒng)斜拉橋。(3)通過Midas/Civil有限元軟件建立了榕江大橋全橋施工全過程的計算模型,計算并分析了各施工階段和成橋運營階段結(jié)構(gòu)受力情況。根據(jù)榕江大橋的結(jié)構(gòu)特點,運用Midas/Civil有限元軟件建立了以主塔高度、主梁高度和輔助墩位置為結(jié)構(gòu)變化參數(shù)的多個成橋階段計算模型,論證了榕江大橋?qū)嶋H設(shè)計方案結(jié)構(gòu)參數(shù)取值的合理性。(4)針對榕江大橋70m次邊跨鋼箱梁,擬定了橋面吊機懸拼法和支架法拼裝兩種施工方案,利用FBR_CAL_SUO有限元軟件建立了兩種施工方案的全橋施工全過程有限元分析模型,并從方案可行性、安全性、經(jīng)濟性和施工控制難易性等方面論證比較了兩種施工方案,最后確定了推薦方案的施工張拉力和拼裝標高。(5)針對性地選取了最不利荷載組合下索力最大以及斜拉索水平傾角最小的梁段為研究對象,通過Midas/FEA有限元軟件對混合梁矮塔斜拉橋鋼箱梁索梁錨固區(qū)進行了應(yīng)力分析。
[Abstract]:Low tower cable-stayed bridge is a kind of bridge structure which combines the advantages of traditional cable-stayed bridge and continuous girder bridge or continuous rigid frame bridge. It has the style of cable-stayed bridge but the mechanical characteristics of the structure. The structure size ratio and cable arrangement are different from the traditional cable-stayed bridge. At present, the rigid beam low tower cable-stayed bridge is built more, but the beam height is smaller, and the main beam is more soft. Easier to coordinate with the environment and more popular. Therefore, this paper takes the world's largest span hybrid beam low tower cable-stayed bridge-the Rongjiang Bridge of Chaohui Expressway in Guangdong Province as the engineering background, and focuses on the definition of the hybrid beam short tower cable-stayed bridge. A series of research work has been carried out on the stress characteristics of the structure, the analysis of structural parameters, the construction scheme of the main beam and the stress analysis of the cable beam Anchorage zone. Based on the function of Matlab symbol calculation, the calculation formula of structural characteristic parameters of hybrid beam cable-stayed bridge with low tower is derived. The finite element simulation model and structural parameter analysis model considering the whole process of bridge construction are established by Midas/Civil finite element software. The construction scheme of secondary span steel box girder of Rongjiang Bridge is demonstrated and compared by using FBR_CAL_SUO finite element software. The local stress analysis of cable beam Anchorage zone is carried out by using Midas/FEA. The main contents of this paper are as follows: 1) the development of the cable-stayed bridge with low tower is briefly described in this paper. In this paper, the research trends of hybrid beam cable-stayed bridge with low tower are analyzed, and the ratio of live load of cable-stayed bridge with hybrid beam is proposed as an important index to reflect the essential characteristics of the structure. The formula for calculating the live load ratio of cable-stayed bridge with different boundary conditions and different layout forms of steel-concrete main beam is derived by using the idea of equivalent beam analogy and the function of Matlab symbol calculation. The relationship between the structure parameters and the structure parameters is analyzed. (2) based on the statistical analysis of many real bridges. The concrete numerical index is put forward as the dividing point to define the hybrid beam low tower cable-stayed bridge. When the live load ratio of cable beam is less than 0.5, the rigid beam low tower cable-stayed bridge is proposed. The calculation model of the whole construction process of the whole bridge of Rongjiang Bridge is established by Midas/Civil finite element software when the flexible beam with short tower cable-stayed bridge or the traditional cable-stayed bridge is more than 0.5. According to the structural characteristics of the Rongjiang Bridge, the height of the main tower is established by using Midas/Civil finite element software. The calculation model of the bridge stage is the height of the main beam and the position of the auxiliary pier. This paper demonstrates the rationality of the structural parameters of the actual design scheme of the Rongjiang Bridge. Aiming at the 70m span steel box girder of the Rong River Bridge, two construction schemes are proposed, one is the bridge deck crane assembly method and the other is the support method. The finite element analysis model of the whole construction process of two kinds of construction schemes is established by using FBR_CAL_SUO finite element software, and the feasibility and safety of the scheme are discussed. Two construction schemes are discussed and compared in terms of economy and construction control difficulty. Finally, the construction tensioning force and assembling elevation of the recommended scheme are determined. (5) the maximum cable force and the minimum horizontal inclination of the cable under the most unfavorable load combination are selected as the research object. The stress analysis of cable beam Anchorage zone of steel box girder of hybrid beam low tower cable-stayed bridge is carried out by Midas/FEA finite element software.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.27

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