異形拱橋動力特性與穩(wěn)定性研究
發(fā)布時間：2019-03-14 10:18
【摘要】：異形拱橋由于結(jié)構(gòu)造型新穎,外形優(yōu)美,在中小跨度橋梁特別是城市橋梁中應(yīng)用較多。但異形拱橋結(jié)構(gòu)受力復(fù)雜,其結(jié)構(gòu)動力特性和穩(wěn)定性是橋梁設(shè)計和施工較為關(guān)心的問題。本文以常德柳葉湖異形拱橋為工程背景,對該橋動力特性及穩(wěn)定性進行了分析和對比,并開展了參數(shù)研究,主要工作和結(jié)論如下:介紹了拱橋的結(jié)構(gòu)特點和發(fā)展歷史,對依托工程進行了介紹。闡述了結(jié)構(gòu)動力特性分析和穩(wěn)定性分析的基本原理和方法。基于ANSYS有限元分析軟件建立了柳葉湖異形拱橋全橋有限元計算模型,獲得了大橋前10階頻率和振型,并將計算結(jié)果與MIDAS CIVIL的全橋動力特性分析結(jié)果進行了對比,結(jié)果的一致性表明了計算分析的可靠性。動力特性分析顯示,大橋第一階模態(tài)為主拱橫橋向整體側(cè)彎,頻率明顯低于主拱和主梁豎彎模態(tài)頻率,表明大橋主拱剛度最小。分析同時表明,大橋扭轉(zhuǎn)模態(tài)出現(xiàn)較早,可能與主梁梁高小、高寬比小有關(guān)。基于建立的柳葉湖異形拱橋全橋有限元計算模型,在ANSYS和MIDAS CIVIL中分別開展了全橋穩(wěn)定性分析,獲得了大橋前5階失穩(wěn)模態(tài),兩款有限元分析軟件獲得的結(jié)果差別小。計算獲得的第一階屈曲模態(tài)特征值為29.4,表現(xiàn)為主拱橫橋向側(cè)彎,說明該橋最先發(fā)生的失穩(wěn)為主拱側(cè)彎,這也再次表明大橋主拱側(cè)向剛度最小,但由于該失穩(wěn)模態(tài)對應(yīng)的特征值明顯大于工程經(jīng)驗認可值,因而柳葉湖大橋全橋穩(wěn)定性是有保障的。選取多個有重要影響的結(jié)構(gòu)參數(shù),獲得了這些結(jié)構(gòu)參數(shù)變化下柳葉湖異形拱橋全橋動力特性和穩(wěn)定性計算結(jié)果,分析了不同參數(shù)的影響程度,突出了有重要影響的結(jié)構(gòu)參數(shù)。本文開展的相關(guān)動力特性和穩(wěn)定性有限元研究結(jié)果,為柳葉湖異形拱橋的設(shè)計和建造提供了重要的參考。
[Abstract]:Special-shaped arch bridge is widely used in small and medium span bridges, especially in urban bridges because of its novel structure and beautiful shape. However, the structural dynamic characteristics and stability of the special-shaped arch bridge are of great concern in the design and construction of the bridge. Based on the engineering background of Changde Liuye Lake special-shaped arch bridge, the dynamic characteristics and stability of the bridge are analyzed and compared, and the parameters are studied. The main work and conclusions are as follows: the structural characteristics and development history of the arch bridge are introduced. This paper introduces the project relying on it. The basic principle and method of structural dynamic characteristic analysis and stability analysis are described. Based on the finite element analysis software ANSYS, the finite element calculation model of Liuye Lake special-shaped arch bridge is established. The first 10 order frequencies and mode shapes of the bridge are obtained, and the calculated results are compared with the results of MIDAS CIVIL's full bridge dynamic analysis. The consistency of the results shows the reliability of the calculation and analysis. The dynamic characteristic analysis shows that the first mode of the bridge is the lateral bending of the main arch and the frequency is obviously lower than the vertical bending modal frequencies of the main arch and the main beam, indicating that the stiffness of the main arch of the bridge is the smallest. The analysis also shows that the torsional mode of the bridge appears earlier, which may be related to the small height and the ratio of height to width of the main beam. Based on the established finite element calculation model of Liuye Lake special-shaped arch bridge, the stability analysis of the whole bridge is carried out in ANSYS and MIDAS CIVIL respectively, and the five-order unstable modes in front of the bridge are obtained. The difference between the results obtained by the two finite element analysis software is small. The calculated eigenvalues of the first-order buckling modes are 29.4, which shows that the lateral bending of the main arch appears in the transverse direction of the main arch, which indicates that the first instability of the bridge occurs in the lateral bending of the main arch, which also indicates that the lateral stiffness of the main arch of the bridge is the smallest. However, the stability of the Liuye Lake Bridge is guaranteed because the characteristic value corresponding to the instability mode is obviously larger than the approved value of the engineering experience. The dynamic characteristics and stability calculation results of the Liuye Lake special-shaped arch bridge under the variation of these structural parameters are obtained. The influence degree of different parameters is analyzed and the important structural parameters are highlighted. The research results of the dynamic characteristics and stability of this paper provide an important reference for the design and construction of the Liuye Lake special-shaped arch bridge.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U448.22
本文編號：2439893
[Abstract]:Special-shaped arch bridge is widely used in small and medium span bridges, especially in urban bridges because of its novel structure and beautiful shape. However, the structural dynamic characteristics and stability of the special-shaped arch bridge are of great concern in the design and construction of the bridge. Based on the engineering background of Changde Liuye Lake special-shaped arch bridge, the dynamic characteristics and stability of the bridge are analyzed and compared, and the parameters are studied. The main work and conclusions are as follows: the structural characteristics and development history of the arch bridge are introduced. This paper introduces the project relying on it. The basic principle and method of structural dynamic characteristic analysis and stability analysis are described. Based on the finite element analysis software ANSYS, the finite element calculation model of Liuye Lake special-shaped arch bridge is established. The first 10 order frequencies and mode shapes of the bridge are obtained, and the calculated results are compared with the results of MIDAS CIVIL's full bridge dynamic analysis. The consistency of the results shows the reliability of the calculation and analysis. The dynamic characteristic analysis shows that the first mode of the bridge is the lateral bending of the main arch and the frequency is obviously lower than the vertical bending modal frequencies of the main arch and the main beam, indicating that the stiffness of the main arch of the bridge is the smallest. The analysis also shows that the torsional mode of the bridge appears earlier, which may be related to the small height and the ratio of height to width of the main beam. Based on the established finite element calculation model of Liuye Lake special-shaped arch bridge, the stability analysis of the whole bridge is carried out in ANSYS and MIDAS CIVIL respectively, and the five-order unstable modes in front of the bridge are obtained. The difference between the results obtained by the two finite element analysis software is small. The calculated eigenvalues of the first-order buckling modes are 29.4, which shows that the lateral bending of the main arch appears in the transverse direction of the main arch, which indicates that the first instability of the bridge occurs in the lateral bending of the main arch, which also indicates that the lateral stiffness of the main arch of the bridge is the smallest. However, the stability of the Liuye Lake Bridge is guaranteed because the characteristic value corresponding to the instability mode is obviously larger than the approved value of the engineering experience. The dynamic characteristics and stability calculation results of the Liuye Lake special-shaped arch bridge under the variation of these structural parameters are obtained. The influence degree of different parameters is analyzed and the important structural parameters are highlighted. The research results of the dynamic characteristics and stability of this paper provide an important reference for the design and construction of the Liuye Lake special-shaped arch bridge.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U448.22
【參考文獻】
相關(guān)期刊論文 前1條
1 丁大鈞;我國拱橋建設(shè)屢創(chuàng)輝煌[J];橋梁建設(shè);2000年01期
相關(guān)博士學(xué)位論文 前1條
1 康厚軍;索拱結(jié)構(gòu)的穩(wěn)定與振動研究[D];湖南大學(xué);2007年
相關(guān)碩士學(xué)位論文 前2條
1 馮文煥;橋梁結(jié)構(gòu)動力特性研究[D];長安大學(xué);2013年
2 孟杰;系桿拱橋結(jié)構(gòu)體系研究[D];湖南大學(xué);2002年
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