發(fā)布時間：2018-09-09 20:24

【摘要】：查閱國內外關于高墩連續(xù)剛構橋的發(fā)展歷史與現(xiàn)狀，高墩連續(xù)剛構由于自身的優(yōu)越性在橋梁大家族中占有一席之地，特別是在我國西部地區(qū)得到廣泛應用。連續(xù)剛構高墩大多采用薄壁截面形式，故其自身的穩(wěn)定問題非常突出。高墩的穩(wěn)定問題也是工程實際應用中不可忽略的關鍵問題。因此高墩的穩(wěn)定性研究就顯得十分有意義。本文結合背景工程的一座高墩多跨連續(xù)剛構橋對高墩的抗推剛度的合理性，高墩的計算長度系數(shù)以及高墩剛構橋的穩(wěn)定性做了一些研究。 ⑴首先從高墩的抗推剛度、薄壁墩縱向合理厚度、雙薄壁墩間距幾個方面對高墩剛度的合理性進行了研究，結果表明高墩剛構橋采用雙肢薄壁墩，在縱橋向既有很好的柔度又具有足夠的抗彎剛度，而且合理的雙薄壁墩間距能夠降低主梁墩頂截面的彎矩，從而降低梁高，，橋梁顯得更加纖細與美觀。 ⑵接著介紹了從結構的穩(wěn)定特征值反算高墩的計算長度系數(shù)和考慮偏心受壓、而且邊界條件非標準情況下，利用構件的撓曲微分方程來求解計算長度系數(shù)；高墩連續(xù)剛構可能出現(xiàn)的兩種失穩(wěn)情況進行穩(wěn)定性分析時，應該取不同的計算長度系數(shù)值。 ⑶最后，本文高墩連續(xù)剛構橋在施工到運營階段3個關鍵階段的穩(wěn)定性進行了研究.研究結果表明高墩剛構橋的穩(wěn)定性主要有其自身的自重決定，而其它的風荷載、施工荷載、偶然荷載、汽車荷載以及溫度荷載等均對高墩剛構的穩(wěn)定性影響很小。
[Abstract]:Referring to the development history and present situation of continuous rigid frame bridge with high piers at home and abroad, the continuous rigid frame with high pier occupies a place in the bridge family because of its own superiority, especially in the western region of our country. The continuous rigid frame high pier is mostly thin-walled section, so its own stability problem is very prominent. The stability of high piers is also a key problem in engineering practice. Therefore, the study of the stability of high piers is of great significance. In this paper, the rationality of a multi-span continuous rigid frame bridge with high piers, the calculation length coefficient of high piers and the stability of rigid frame bridges with high piers are studied. The reasonable longitudinal thickness of thin-walled piers and the spacing between two thin-walled piers are studied. The results show that the rigid frame bridges with high piers have both good flexibility and sufficient flexural stiffness in the longitudinal direction. Moreover, reasonable spacing between two thin-walled piers can reduce the bending moment of the top section of the main beam pier, thus reducing the beam height. The bridge is more slender and beautiful. (2) then the calculated length coefficient and eccentricity of the pier are calculated from the stability eigenvalue of the structure, and the boundary conditions are non-standard. The calculated length coefficient is solved by using the flexural differential equation of the member, and when the stability analysis of two possible instability cases of continuous rigid frame with high pier is carried out, different values of the calculated length coefficient should be taken. 3 finally, In this paper, the stability of continuous rigid frame bridge with high piers in three key stages from construction to operation is studied. The results show that the stability of high pier rigid frame bridge is mainly determined by its own weight, while other wind load, construction load, accidental load, automobile load and temperature load have little influence on the stability of high pier rigid frame.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.23

【參考文獻】

相關期刊論文 前9條

1 李黎;廖萍;龍曉鴻;彭元誠;;薄壁高墩大跨度連續(xù)剛構橋的非線性穩(wěn)定分析[J];工程力學;2006年05期

2 何暢;薄壁高墩連續(xù)剛構橋的空間穩(wěn)定分析[J];公路;2005年11期

3 白浩,楊昀,趙小星;高墩大跨徑彎連續(xù)剛構橋梁空間非線性穩(wěn)定分析[J];公路交通科技;2005年05期

4 王鈞利,賀拴海;高墩大跨度曲線橋懸臂施工階段非線性分析[J];公路交通科技;2005年10期

5 王常峰;陳興沖;夏修身;;高墩大跨連續(xù)剛構橋抗震設計參數(shù)優(yōu)化[J];公路交通科技;2006年04期

6 張孟喜,楊惠林,王景春;三灘黃河大橋雙薄壁橋墩的設計參數(shù)優(yōu)化[J];中外公路;2004年03期

7 劉曉舟;;彈性地基高墩非線性穩(wěn)定分析[J];華東公路;2006年02期

8 侯志偉;;高墩在橋梁中應用現(xiàn)狀分析及探討[J];黑龍江交通科技;2011年08期

9 王鈞利;賀拴海;;高墩大跨徑彎橋在懸臂施工階段剛構的非線性穩(wěn)定分析[J];交通運輸工程學報;2006年02期

本文編號：2233475