寸滩长江大桥锚碇构造特点与受力分析研究

发布时间：2018-06-06 06:25

本文选题：悬索桥 + 重力式锚碇　；参考：《重庆交通大学》2015年硕士论文

【摘要】：悬索桥外观造型优美,跨越能力大,在1000m以上的大跨径桥梁中是其他任何桥型无法超越的。在国民经济高速发展的今天,对交通运输量的要求也越来越高,而我国大江大河众多,海岸线也很长,悬索桥势必会成为日后大跨度桥型中的主要方案。锚碇作为悬索桥最重要的承重构件之一,它的主要作用就是将主缆的巨大拉力传递给地基。重力式锚碇则是依靠混凝土的自重来抵消主缆拉力的竖向方向分力,主缆的水平方向分力则是由基岩与混凝土基础间的摩擦以及基础前侧土体的抗力来抵抗。本文主要围绕重庆寸滩长江大桥重力式锚碇结构而展开,先对悬索桥锚碇结构的结构组成、受力特点等方面做了简单的概述,也总结了现在一些国内学者在重力式锚碇结构方面的相关研究;结合现行锚碇设计的原则,对锚碇结构的稳定性理论、结构分析计算原理(常规解析方法与有限元法)及温度应力对大体积混凝土的影响做了系统介绍;结合已建悬索桥的锚碇结构形式,对寸滩长江大桥的锚碇的构造特点进行了简单总结;运用稳定性理论,分析了寸滩长江大桥南锚碇和北锚碇的地基承载力、整体抗滑移和抗倾覆稳定性以及对锚块的斜截面抗剪进行了验算,还分析探索了北锚碇砂质泥岩上基岩摩阻力和地基承载力试验的相关方法和步骤,并得到了相应的试验结果;运用有限元软件Midas/FEA建立实体有限元模型,探讨了预应力前锚式、后锚式两种锚固系统作用下锚碇结构各组成部分的应力分布情况,并对两种锚固方式下关键部位的应力分布进行了比较分析;最后,对散索鞍支墩倾斜角度的不同对支墩底部应力的改善做了简单分析。论文成果对同类型锚碇结构的优化具有一定参考价值。
[Abstract]:The suspension bridge has a beautiful appearance and large span ability, which can not be surpassed by any other bridge type in the long span bridge over 1000m. With the rapid development of the national economy, the demand for traffic and transportation volume is becoming higher and higher, and there are many big rivers and long coastline in our country, so the suspension bridge is bound to become the main scheme of the long-span bridge in the future. Anchorage is one of the most important load-bearing components of suspension bridge. Its main function is to transfer the great tension of the main cable to the foundation. The gravity Anchorage relies on the weight of concrete to offset the vertical force of the main cable, and the horizontal force of the main cable is resisted by the friction between the bedrock and the concrete foundation and the resistance of the soil in front of the foundation. This paper mainly focuses on the gravity Anchorage structure of Cuntan Yangtze River Bridge in Chongqing. First of all, the structure composition and mechanical characteristics of the suspension bridge Anchorage structure are briefly summarized. Also summarized some domestic scholars in the gravity Anchorage structure related research, combined with the current principles of Anchorage design, the stability of Anchorage structure theory, The principle of structural analysis and calculation (conventional analytical method and finite element method) and the effect of temperature stress on mass concrete are introduced systematically, and the Anchorage structure of the suspension bridge is also introduced. The structural characteristics of Anchorage of Putan Yangtze River Bridge are summarized, and the foundation bearing capacity of south Anchorage and North Anchorage of Cuntan Yangtze River Bridge is analyzed by using stability theory. The whole anti-slip and anti-overturning stability and the shear resistance of the inclined section of the anchor block are checked and calculated. The relevant methods and steps for the test of the friction resistance of the bedrock and the bearing capacity of the foundation on the sand mudstone of the North Anchorage are analyzed and explored, and the corresponding test results are obtained. The finite element model is established by using the finite element software Midas/FEA, and the stress distribution of each part of the Anchorage structure under the action of two kinds of anchoring systems, namely the pre-stressed anchor type and the post-anchor type, is discussed. The stress distribution of the key parts under two kinds of anchoring modes is compared and analyzed. Finally, the improvement of the stress at the bottom of the pier is simply analyzed by the different inclined angles of the saddle support pier. The results of this paper have certain reference value for the optimization of the same type of Anchorage structure.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.25

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