【摘要】：斜塔自錨式懸索橋是一種新式的橋梁結構樣式,由于其造型美觀、對地形的要求比較低并且適應性較強,因此獲得人們的青睞。對于這樣比較新穎的結構來說,其受力性能與一般的懸索橋是有所不同的,有必要根據(jù)其自身的受力特點進行分析研究。本文以朝陽市燕陽山南路大橋為背景,做了一些靜力分析、索塔的穩(wěn)定性研究和索塔的優(yōu)化設計的相關工作,可以為類似的橋梁設計和研究提供借鑒。主要工作如下： (1)首先回顧了懸索橋及自錨式懸索橋的發(fā)展現(xiàn)狀,然后介紹了自錨式懸索橋的計算分析方法、引起幾何非線性的要素和非線性問題的幾種解法。 (2)利用MIDAS CIVIL建立全橋空間模型,利用節(jié)線法和懸鏈線法確定出該斜塔自錨式懸索橋的成橋線型,考慮了索夾對主纜及吊桿的無應力長度的影響,確定了修正后的主纜及吊桿的無應力長度。對不同的荷載作用,結構主要部分的受力情況進行了分析對比,以確定不同荷載對結構的影響。計算結果表明,除恒載之外,對于主要受力構件來說,活載產(chǎn)生的軸力和位移值最大,其余荷載影響相對較小。 (3)介紹了穩(wěn)定問題的理論和分析方法,建立ANSYS模型對斜塔自錨式懸索橋的索塔進行了穩(wěn)定性分析。通過建立不同的單元模型,得到了彈性穩(wěn)定、幾何非線性和材料非線性穩(wěn)定在不同工況下的穩(wěn)定系數(shù),并對結果進行了對比分析。結果表明雙重非線性的穩(wěn)定系數(shù)較幾何非線性相比相差較大,僅為幾何非線性的42%左右。因此,在計算類似結構的穩(wěn)定性時,應該考慮幾何非線性和材料非線性的影響。 (4)對鋼管桁架的結構形式和設計做了簡要的介紹,指出桁架設計的關鍵問題。主要對影響鋼管桁架索塔穩(wěn)定性的因素進行分析,對比了不同主管壁厚、不同主管直徑、不同斜撐布置方式和不同寬高比對索塔穩(wěn)定性的影響,為鋼管桁架的索塔設計提供參考。結果表明,主管壁厚選擇45mm,主管直徑選擇1.6m能夠滿足穩(wěn)定性的要求,并且材料的應力儲備也較好。達到同樣的穩(wěn)定效果之下,Warren型布置方式比Pratt型布置方式節(jié)省材料約16.9%左右。隨著寬高比的增加,索塔的穩(wěn)定性先增大后降低。當寬高比為0.7時,結構的穩(wěn)定系數(shù)最高。
[Abstract]:Inclined tower self-anchored suspension bridge is a new type of bridge structure. Because of its beautiful shape, low requirements for terrain and strong adaptability, it has been favored by people. For such a relatively novel structure, its mechanical performance is different from that of the general suspension bridge, so it is necessary to analyze and study it according to its own stress characteristics. Based on the background of Yanyang Mountain South Road Bridge in Chaoyang City, this paper makes some static analysis, the research on the stability of the cable tower and the optimization design of the cable tower, which can be used for reference for similar bridge design and research. The main work is as follows: (1) the development status of suspension bridge and self-anchored suspension bridge is reviewed, and then the calculation and analysis method of self-anchored suspension bridge, the elements causing geometric nonlinear and several solutions of nonlinear problems are introduced. (2) the spatial model of the whole bridge is established by MIDAS CIVIL, and the bridge line of the inclined tower self-anchored suspension bridge is determined by using the section method and catenary method. The influence of cable clip on the stress-free length of the main cable and suspender is considered, and the stress-free length of the modified main cable and suspender is determined. The effects of different loads on the main parts of the structure are analyzed and compared in order to determine the influence of different loads on the structure. The calculation results show that, except for dead load, the axial force and displacement produced by live load are the largest, and the influence of other loads is relatively small. (3) the theory and analysis method of the stability problem are introduced, and the ANSYS model is established to analyze the stability of the cable tower of the inclined tower self-anchored suspension bridge. By establishing different element models, the stability coefficients of elastic stability, geometric nonlinear and material nonlinear stability under different working conditions are obtained, and the results are compared and analyzed. The results show that the stability coefficient of the double nonlinear is only about 42% of the geometric nonlinear compared with the geometric nonlinear. Therefore, the effects of geometric nonlinear and material nonlinear should be considered when calculating the stability of similar structures. (4) the structural form and design of steel pipe truss are briefly introduced, and the key problems of truss design are pointed out. The factors affecting the stability of steel pipe truss cable tower are analyzed, and the effects of different main wall thickness, different main pipe diameter, different oblique brace arrangement and different width and height on the stability of steel pipe truss cable tower are compared, which provides a reference for the cable tower design of steel pipe truss. The results show that the wall thickness of the supervisor is 45 mm and the diameter of the supervisor is 1.6 m, which can meet the requirements of stability, and the stress reserve of the material is also good. Under the same stable effect, the Warren arrangement saves about 16.9% of the material compared with the Pratt arrangement. With the increase of aspect ratio, the stability of cable tower increases at first and then decreases. When the aspect ratio is 0.7, the stability coefficient of the structure is the highest.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441;U448.25

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