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  本文選題：混凝土斜拉橋　切入點(diǎn)：施工監(jiān)控　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：斜拉橋以其優(yōu)秀的跨越能力,合理的受力體系以及新穎美觀的結(jié)構(gòu)形式,已經(jīng)成為現(xiàn)代橋梁結(jié)構(gòu)中發(fā)展最快,最具有競爭力的橋型之一。隨著斜拉橋跨度、構(gòu)造復(fù)雜性和施工難度的增大,愈發(fā)要求更加完善的斜拉橋施工監(jiān)控體系和健康監(jiān)測系統(tǒng)。一方面施工監(jiān)測與控制是保證大型橋梁建設(shè)質(zhì)量的重要措施,在施工過程中需要對關(guān)鍵技術(shù)進(jìn)行嚴(yán)格控制,及時識別、修正誤差,保證成橋內(nèi)力和線形與設(shè)計相符；另一方面,橋梁結(jié)構(gòu)運(yùn)營過程中在超載車輛和環(huán)境侵蝕等因素的影響下,將不可避免地出現(xiàn)各種損傷和病害,而利用傾角儀進(jìn)行橋梁動態(tài)撓度的實(shí)時在線監(jiān)測不僅成本較低,而且有利于及時發(fā)現(xiàn)橋梁的局部損壞和承載能力下降的情況并采取措施,有效預(yù)防結(jié)構(gòu)的突發(fā)性災(zāi)難。在此背景下,本文結(jié)合舟山市小干大橋的結(jié)構(gòu)特點(diǎn),做出以下方面的工作： 1)建立有限元分析模型,進(jìn)行施工仿真計算,確定了控制重點(diǎn)和控制參數(shù)量,為施工監(jiān)控提供理論數(shù)據(jù)；得到與合理成橋狀態(tài)相對應(yīng)的結(jié)構(gòu)理想施工參數(shù)：主梁成橋預(yù)拱度、各節(jié)段立模標(biāo)高、施工階段斜拉索張拉力、施工階段牽索張拉力、斜拉索無應(yīng)力索長等； 2)根據(jù)牽索掛籃索力的確定原則和方法,計算了以橋梁結(jié)構(gòu)和掛籃施工安全為控制條件的牽索張拉力。建立掛籃的梁單元模型,驗(yàn)算其在不同工況的空間應(yīng)力和變形。同時針對掛籃牽索處應(yīng)力集中的問題建立空間板殼單元模型,進(jìn)行局部分析； 3)針對斜拉橋,采用QY型伺服式傾角儀進(jìn)行橋梁轉(zhuǎn)角的測量,基于三次樣條曲線理論,建立了由轉(zhuǎn)角計算撓度的數(shù)學(xué)模型,通過有限元仿真,檢驗(yàn)了此模型的精度； 4)根據(jù)斜拉索索力測量精度的影響理論,考慮了牽索接長桿和減震器兩個因素在不同索力測量階段對于索力測量精度的影響；根據(jù)采樣定理和工程實(shí)踐確定了每根斜拉索索力測量過程中采樣頻率的范圍。
[Abstract]:The cable-stayed bridge has become one of the fastest growing and most competitive bridge types in modern bridge structure with its excellent span ability, reasonable force system and novel and beautiful structural form, with the span of cable-stayed bridge, With the increase of structural complexity and construction difficulty, more perfect construction monitoring system and health monitoring system for cable-stayed bridges are required. On the one hand, construction monitoring and control is an important measure to ensure the construction quality of large bridges. In the process of construction, it is necessary to strictly control the key technologies, identify and correct the errors in time, and ensure that the internal force and alignment of the bridge are in accordance with the design. On the other hand, under the influence of overloaded vehicles and environmental erosion during the operation of the bridge structure, All kinds of damage and diseases will inevitably occur, and the real-time on-line monitoring of bridge dynamic deflection by using dipmeter is not only low cost, but also helpful to discover the local damage and reduce the bearing capacity of the bridge in time and to take measures. In this context, combining the structural characteristics of Xiaogan Bridge in Zhoushan City, the following work has been done:. 1) establish the finite element analysis model, carry on the construction simulation calculation, determine the control emphasis and control parameter quantity, provide the theoretical data for the construction monitoring and control, obtain the ideal construction parameter of the structure corresponding to the reasonable completion state of the bridge: the pre-arch degree of the main girder bridge, The elevation of each section of the formwork, the tension of cable in construction stage, the tension of cable in construction stage, the length of cable without stress, etc. 2) according to the principle and method of determining the cable force of the cable hanging basket, the tension of the cable is calculated under the control condition of the bridge structure and the construction safety of the hanging basket, and the beam element model of the hanging basket is established. At the same time, the spatial plate and shell element model is established to solve the problem of stress concentration in the hanging basket cable, and the local analysis is carried out. 3) aiming at the cable-stayed bridge, the angle of the bridge is measured by using the QY servo tiltmeter. Based on the cubic spline curve theory, the mathematical model of calculating the deflection from the angle of rotation is established, and the accuracy of the model is tested by finite element simulation. 4) according to the theory of the influence of cable force measurement precision, the influence of two factors, the long cable connecting rod and the shock absorber, on the cable force measurement accuracy in different stages of cable force measurement is considered. According to the sampling theorem and engineering practice, the range of sampling frequency in the process of measuring the force of each cable is determined.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.27;U446

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 喻梅;李喬;廖海黎;;多塔斜拉橋的剛度配置[J];四川建筑科學(xué)研究;2010年04期

2 張文基,劉喜元,岳建平;大跨徑橋梁撓度觀測方法評述[J];測繪通報;2002年08期

3 郝超,裴岷山,強(qiáng)士中;大跨度斜拉橋拉索無應(yīng)力長度的計算方法比較[J];重慶交通學(xué)院學(xué)報;2001年03期

4 吳海軍,陳思甜,龔尚龍,許羿,施尚偉;斜拉橋索力測試方法研究[J];重慶交通學(xué)院學(xué)報;2001年04期

5 段波,曾德榮,盧江;關(guān)于斜拉橋索力測定的分析[J];重慶交通學(xué)院學(xué)報;2005年04期

6 王伯惠;臺灣的斜拉橋[J];東北公路;2000年04期

7 楊學(xué)山,馬樹林;QY型傾角儀瞬態(tài)反應(yīng)測試方法的研究[J];地震工程與工程振動;2002年02期

8 辛克貴,馮仲;大跨度斜拉橋的施工非線性倒拆分析[J];工程力學(xué);2004年05期

9 趙躍宇;周海兵;金波;劉偉長;;彎曲剛度對斜拉索非線性固有頻率的影響[J];工程力學(xué);2008年01期

10 楊建春;陳偉民;;連通管式光電撓度測量系統(tǒng)及其大橋監(jiān)測應(yīng)用[J];光電子·激光;2006年03期

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本文編號：1618079