本文選題：斜拉索 + 拉索銹蝕�。� 參考：《石家莊鐵道大學》2015年碩士論文

【摘要】：隨著服役時間的增長,斜拉索在使用過程中不可避免地會受到腐蝕退化、振動疲勞等不利因素的影響,從而導致拉索損傷。由于拉索的銹蝕損傷過程緩慢且不易察覺,故本文將拉索的銹蝕損傷作為研究重點。拉索銹蝕會引起拉索索力和主梁撓度發(fā)生變化,對斜拉橋的承載性能造成嚴重影響,直接影響著斜拉橋的正常運營,因此研究拉索損傷對索力及主梁撓度變化的影響有很大的實際意義和科研價值的。本文以蕪湖長江大橋180 m+320 m+180 m矮塔斜拉橋為研究對象,依據(jù)其設計圖紙,利用ANSYS建立該橋的有限元模型,并對模型索力及預拱度進行修正,使模型索力及線形與實橋數(shù)據(jù)一致,修正好的模型便為該橋的有限元基準模型。另外,通過ANSYS建立了一個獨塔單索面斜拉橋的基準模型,分別用面積折減法、彈模折減法、反向荷載法以及實體模擬法四種方法模擬拉索的銹蝕,分析拉索銹蝕斷絲后索力及主梁撓度的變化規(guī)律,從而得到拉索銹蝕的最佳表征形式;用實體模擬法對拉索銹蝕未斷絲的情況進行了模擬,來分析不同拉索在不同銹蝕程度下索力及主梁撓度的變化規(guī)律。然后將上述得到的最佳表征方法運用于蕪湖長江大橋斜拉橋的基準模型中,研究不同拉索銹蝕不同程度時拉索索力及主梁撓度的變化規(guī)律,并對該橋在不同的荷載作用下索力和撓度的變化進行了分析。將損傷效應與荷載效應兩種情況進行對比,分析兩者的區(qū)別。最后分析該橋拉索損傷后在不同荷載作用下拉索索力及主梁撓度的變化規(guī)律,研究荷載效應對損傷效應的放大作用,以便更準確地對拉索損傷進行識別。
[Abstract]:With the increase of service time, the cable will inevitably be affected by corrosion degradation, vibration fatigue and other adverse factors in the process of use, resulting in cable damage. Because the corrosion damage of cable is slow and difficult to detect, the corrosion damage of cable is considered as the focus in this paper. The corrosion of cable will cause the change of cable force and deflection of main beam, which will seriously affect the bearing capacity of cable-stayed bridge and directly affect the normal operation of cable-stayed bridge. Therefore, it is of great practical significance and scientific research value to study the influence of cable damage on cable force and deflection of main beam. This paper takes the 180 m 320 m 180 m low tower cable-stayed bridge of Wuhu Yangtze River Bridge as the research object, according to its design drawing, uses ANSYS to establish the finite element model of the bridge, and modifies the model cable force and pre-arch degree. The model cable force and line shape are consistent with the real bridge data, and the modified model is the finite element benchmark model of the bridge. In addition, a reference model of cable-stayed bridge with single tower and single cable plane is established by ANSYS. The corrosion of cable is simulated by area reduction method, elastic modulus reduction method, reverse load method and solid simulation method, respectively. The variation law of cable force and deflection of main beam after cable rust breaking is analyzed, and the best representation of cable corrosion is obtained. The case of cable corrosion without breaking is simulated by solid simulation method. To analyze the variation law of cable force and beam deflection under different corrosion degree. Then the optimal representation method is applied to the reference model of the cable-stayed bridge of Wuhu Yangtze River Bridge, and the variation law of cable force and deflection of main beam is studied with different degrees of cable corrosion. The variation of cable force and deflection of the bridge under different loads is analyzed. The damage effect and load effect are compared and the difference between them is analyzed. Finally, the variation law of the cable force and the deflection of the main beam after the cable damage is analyzed, and the amplification of the damage effect by the load effect is studied in order to identify the cable damage more accurately.
【學位授予單位】：石家莊鐵道大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U448.27

【參考文獻】

相關期刊論文 前2條

1 曾威;于德介;胡柏學;劉克明;郭建文;;基于連通管原理的橋梁撓度自動監(jiān)測系統(tǒng)[J];湖南大學學報(自然科學版);2007年07期

2 張治國;張謝東;;基于模態(tài)分析理論和神經網絡的斜拉橋拉索損傷識別研究[J];中南公路工程;2007年02期

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本文編號：1982894