【摘要】：曲線斜拉橋是一種主梁縱向軸線為曲線的斜拉橋,此類橋型既呈現(xiàn)出曲線梁橋的特征,又具備斜拉橋的結(jié)構(gòu)性能,呈現(xiàn)出復(fù)雜的空間受力狀態(tài)。曲率半徑及塔高是曲線斜拉橋的重要設(shè)計參數(shù),決定著結(jié)構(gòu)的總體布置,對結(jié)構(gòu)受力性能也有顯著影響。文章使用專業(yè)有限元軟件,對此類橋型在不同曲率半徑及塔高下的結(jié)構(gòu)力學(xué)行為進行了研究。本文主要進行了以下幾個方面的工作:1.建立了不同曲率半徑和塔高下的全橋有限元模型,并進行了整體計算分析,獲得了結(jié)構(gòu)在成橋階段恒載作用下索力、主梁內(nèi)力及線型、主塔內(nèi)力及塔頂位移的分布情況,并根據(jù)計算結(jié)果總結(jié)了曲率半徑及塔高變化對此類橋型力學(xué)行為的影響規(guī)律。2.運用能量變分法,假定曲線梁橋n型截面頂板的縱向位移函數(shù),推導(dǎo)了曲線懸臂梁和曲線簡支梁在均布荷載作用下的彈性控制微分方程和正應(yīng)力計算公式,并結(jié)合算例分析了此類截面的剪力滯效應(yīng),驗證了推導(dǎo)過程的正確性。3.通過提取典型截面的正應(yīng)力計算結(jié)果,繪制了正應(yīng)力和剪力滯系數(shù)的橫向分布曲線圖,分析了曲率半徑和塔高對主梁縱、橫向剪力滯效應(yīng)的影響規(guī)律,得到了一些有意義的結(jié)論。對混凝土曲線斜拉橋在不同曲率半徑和塔高下的靜力性能進行了全面分析,明確了此類橋型主梁剪力滯效應(yīng)的空間分布規(guī)律,總結(jié)了曲線斜拉橋的受力特點和設(shè)計依據(jù)。
[Abstract]:Curved cable-stayed bridge is a kind of cable-stayed bridge with main beam longitudinal axis as curve. This type of bridge not only presents the characteristics of curved girder bridge, but also has the structural performance of cable-stayed bridge and presents complex spatial stress state. Curvature radius and tower height are important design parameters of curved cable-stayed bridge, which determine the overall layout of the structure, and also have a significant impact on the mechanical performance of the structure. In this paper, the structural mechanical behavior of this kind of bridge under different curvature radius and tower height is studied by using professional finite element software. The main work of this paper is as follows: 1. The finite element model of the whole bridge with different radius of curvature and tower height is established, and the integral calculation and analysis are carried out. The distribution of cable force, internal force and line shape of main beam, internal force of main tower and displacement of tower top are obtained under dead load at the stage of bridge completion. According to the calculated results, the influence of curvature radius and tower height on the mechanical behavior of this kind of bridge is summarized. 2. Based on the energy variational method and assuming the longitudinal displacement function of n-section roof of curved beam bridge, the elastic control differential equation and normal stress calculation formula of curved cantilever beam and curved simply supported beam under uniform load are derived. The shear lag effect of this kind of section is analyzed with an example, and the correctness of the derivation is verified. 3. By extracting the normal stress calculation result of typical section, the transverse distribution curve of normal stress and shear lag coefficient is drawn, and the influence of curvature radius and tower height on longitudinal and transverse shear lag effect of main beam is analyzed. Some meaningful conclusions have been drawn. The static behavior of concrete curved cable-stayed bridge under different curvature radius and tower height is analyzed comprehensively. The spatial distribution law of shear lag effect of this kind of main girder is clarified. The stress characteristics and design basis of curved cable-stayed bridge are summarized.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U441;U448.27

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