曲率半径与塔高对混凝土曲线斜拉桥静力特性的影响分析
发布时间：2018-12-13 02:12
【摘要】：曲线斜拉桥是一种主梁纵向轴线为曲线的斜拉桥,此类桥型既呈现出曲线梁桥的特征,又具备斜拉桥的结构性能,呈现出复杂的空间受力状态。曲率半径及塔高是曲线斜拉桥的重要设计参数,决定着结构的总体布置,对结构受力性能也有显著影响。文章使用专业有限元软件,对此类桥型在不同曲率半径及塔高下的结构力学行为进行了研究。本文主要进行了以下几个方面的工作:1.建立了不同曲率半径和塔高下的全桥有限元模型,并进行了整体计算分析,获得了结构在成桥阶段恒载作用下索力、主梁内力及线型、主塔内力及塔顶位移的分布情况,并根据计算结果总结了曲率半径及塔高变化对此类桥型力学行为的影响规律。2.运用能量变分法,假定曲线梁桥n型截面顶板的纵向位移函数,推导了曲线悬臂梁和曲线简支梁在均布荷载作用下的弹性控制微分方程和正应力计算公式,并结合算例分析了此类截面的剪力滞效应,验证了推导过程的正确性。3.通过提取典型截面的正应力计算结果,绘制了正应力和剪力滞系数的横向分布曲线图,分析了曲率半径和塔高对主梁纵、横向剪力滞效应的影响规律,得到了一些有意义的结论。对混凝土曲线斜拉桥在不同曲率半径和塔高下的静力性能进行了全面分析,明确了此类桥型主梁剪力滞效应的空间分布规律,总结了曲线斜拉桥的受力特点和设计依据。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441;U448.27
本文编号：2375687
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441;U448.27
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