【摘要】：拉索是斜拉橋結(jié)構(gòu)的重要組成部分，大量事故表明，拉索的損傷通常會(huì)引起橋梁結(jié)構(gòu)力學(xué)特性的改變，尤其是拉索索力和主梁撓度的改變，最終威脅到橋梁的安全。由于拉索結(jié)構(gòu)的復(fù)雜性以及在役拉索損傷理論研究的相對(duì)不完善性，至今還未形成較為全面的針對(duì)拉索損傷識(shí)別及安全評(píng)估的研究方法。本文以蕪湖長(zhǎng)江大橋主航道區(qū)矮塔斜拉橋部分為研究背景，分析梁體撓度隨拉索損傷的敏感性，進(jìn)而探討基于撓度監(jiān)測(cè)拉索損傷方法的可行性。主要研究?jī)?nèi)容有： 首先，利用ANSYS建立了蕪湖長(zhǎng)江大橋的三維有限元模型，并且以實(shí)測(cè)數(shù)據(jù)為依據(jù)進(jìn)行了模型修正，得到準(zhǔn)確、可靠的計(jì)算模型。然后，通過(guò)折減拉索面積的方法模擬拉索損傷，分析單索損傷或雙索同時(shí)損傷10%、30%、50%時(shí)無(wú)車過(guò)橋狀態(tài)下梁體撓度的變化規(guī)律和特點(diǎn)。最后，對(duì)比不同列車荷載作用下梁體撓度的變化規(guī)律和特點(diǎn)，以及單機(jī)荷載和不同損傷組合作用下梁體撓度的變化規(guī)律和特點(diǎn)。 通過(guò)拉索損傷前后的對(duì)比分析發(fā)現(xiàn)：拉索發(fā)生損傷后，損傷索錨固節(jié)點(diǎn)處撓度變化明顯(出現(xiàn)極值點(diǎn))，且損傷拉索兩側(cè)附近節(jié)點(diǎn)的撓度增幅不同，損傷拉索相比鄰近的短索對(duì)應(yīng)的撓度變化增幅較大，而與鄰近長(zhǎng)索對(duì)應(yīng)的撓度變化增幅相近；列車荷載作用對(duì)拉索損傷區(qū)域梁體撓度變化具有明顯的放大作用，同時(shí)還發(fā)現(xiàn)，損傷拉索錨固節(jié)點(diǎn)的撓度隨拉索損傷率的增大而線性增長(zhǎng)。由此可見(jiàn)，對(duì)拉索損傷情況，通過(guò)對(duì)應(yīng)于損傷索錨固節(jié)點(diǎn)（極值點(diǎn)）以及附近節(jié)點(diǎn)的撓度變化趨勢(shì)不僅可識(shí)別損傷索的位置，，還可識(shí)別損傷的程度。
[Abstract]:Cable is an important part of cable-stayed bridge structure. A large number of accidents show that the damage of cable usually leads to the change of mechanical properties of bridge structure, especially the change of cable force and deflection of the main beam, which ultimately threatens the safety of the bridge. Due to the complexity of the cable structure and the relative imperfection of the theoretical study on the damage of the cable in service, there has not been a comprehensive research method for the damage identification and safety assessment of the cable up to now. In this paper, the sensitivity of beam deflection with cable damage is analyzed based on the research background of low tower cable-stayed bridge in Wuhu Yangtze River Bridge main waterway area, and the feasibility of cable damage monitoring method based on deflection is discussed. The main research contents are as follows: firstly, the 3D finite element model of Wuhu Yangtze River Bridge is established by using ANSYS, and the model is modified based on the measured data, and an accurate and reliable calculation model is obtained. Then, the damage of cable is simulated by reducing the area of cable, and the variation law and characteristics of beam deflection under the condition of no vehicle crossing bridge are analyzed under the condition of single cable damage or double cable damage at the same time. Finally, the variation law and characteristics of beam deflection under different train loads are compared, as well as the variation law and characteristics of beam deflection under the combination of single load and different damage. Through the comparative analysis before and after the cable damage, it is found that after the cable damage, the deflection of the damaged cable Anchorage joint changes obviously (the extreme point appears), and the increase of the deflection of the joint near the two sides of the damaged cable is different. The deflection change of damaged cable is larger than that of adjacent short cable, and the increase of deflection is similar to that of adjacent long cable, the train load has obvious magnification effect on the deflection change of beam body in the damaged area of cable, and it is also found that the effect of train load on the deflection change of beam body in the damaged area of cable is obvious, and it is also found that, The deflection of damaged cable Anchorage joints increases linearly with the increase of cable damage rate. Thus it can be seen that the damage of cable can be recognized not only by the position of the damaged cable but also by the deflection change trend of the node corresponding to the anchor node (extremum point) and the nearby node of the damaged cable.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.27;U441.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 衛(wèi)星,強(qiáng)士中;利用ANSYS實(shí)現(xiàn)斜拉橋非線性分析[J];四川建筑科學(xué)研究;2003年04期

2 朱金國(guó),陳宣民;頻率法測(cè)定拉索索力[J];安徽建筑;2003年02期

3 楊建春;陳偉民;;橋梁結(jié)構(gòu)撓度自動(dòng)監(jiān)測(cè)技術(shù)的現(xiàn)狀與發(fā)展[J];傳感器與微系統(tǒng);2006年09期

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

5 張楊永;吳萬(wàn)忠;周云崗;;斜拉橋索力精確模擬的矩陣分析法[J];重慶交通大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年06期

6 李洪升,陶恒亮,郭杏林;基于頻率變化平方比的壓力管道損傷定位方法[J];大連理工大學(xué)學(xué)報(bào);2002年04期

7 史治宇,張令彌,呂令毅;基于模態(tài)應(yīng)變能診斷結(jié)構(gòu)破損的修正方法[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2000年03期

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

9 李義強(qiáng);張彥兵;楊麗;;ANSYS中準(zhǔn)確施加斜拉橋索力方法的研究[J];國(guó)防交通工程與技術(shù);2006年01期

10 施溪溪,李鴻晶;斜拉橋拉索單元模型及其計(jì)算模擬[J];鋼結(jié)構(gòu);2005年05期

相關(guān)博士學(xué)位論文 前1條

1 李盛;基于光纖光柵傳感原理的橋梁索力測(cè)試方法研究與應(yīng)用[D];武漢理工大學(xué);2009年

本文編號(hào)：2280271