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摘要:埃塔-斜拉桥由塔、梁、墩、索四种基本构件组成的组合体系桥。这种桥梁有着主塔较矮、主梁刚度较大、拉索布置集中的特点。是它与梁桥和斜拉桥有所不同，一种新型的桥梁结构，它的受力特点与两者有所相似又有所不同。也可以说，它相当于斜拉桥和梁桥的协作体系。将体外预应力的想法运用到梁桥上，将主梁体内的一部分预应力筋转移到主塔上，用索鞍作为转向点，从而形成了埃塔-斜拉桥。与普通的梁桥相比较，这中桥梁有效的解决了主梁体内空间不足以及预应力筋的利用效率不高的问题。并通过减小主梁的截面尺寸以减小造价。由于其良好的经济特性和美学效果，近些年在国内外得到了快速发展。56088
本文介绍了埃塔斜拉桥的施工设计的主要内容，并分析了某埃塔斜拉桥实例。并学习了某ＰＣ高塔型埃塔-斜拉桥的主要设计要点。对该桥的主要结构设计参数、成桥方式、约束方式、拉索索力等进行了优化研究，并基于以上优化结果对整体桥梁结构进行了详尽的静动力分析和关键构件节点的局部分析设计。
毕业论文关键词:埃塔-斜拉桥，索梁活载比，有限元，优化，设计，拉索，预应力，安全系数，容许应力，结构参数，成桥方式，约束及索力，静动力特性，减震设计。
Abstract
Extra-dosed cable-stayed bridges by column, beam, pier and bridge combination system composed of four basic components.Its characteristic is concentration, dwarf, Liang Gang, tower. Is a new type of bridge structure. It is neither a bridge nor traditional cable-stayed bridge, the mechanical behavior of it somewhere in between, in other words, it is a kind of cable-stayed bridge and the bridge of cooperation system. On the basis of the girder bridge adopted the idea of external prestressing cables, moving the body part of the prestressed cable to tower bridge, cable saddle is equal to the turning point of external prestressing cables. This system solved the beam prestressed allocative efficiency is not high and the problem of insufficient space, also reduce the section size of main girder, has great economic significance. Due to its good economic features and aesthetic effect, both at home and abroad in recent years has been rapid development.
This paper introduces the main content of the extra-dosed cable-stayed bridges construction design, and analyses an actual extra-dosed cable-stayed bridges. And learn some main design points of PC tower type of extra-dosed cable-stayed bridges . On the bridge of the main design parameters, as a way for bridge structure, constraint method, cable force and so on has carried on the optimization study, and based on the above optimization results to the whole bridge structure has carried on the detailed analysis and key components of the static and dynamic node local analysis of the design.
Key words:extra-dosed cable-stayed bridges;cable/beam live-load ratio; FEM; optimization; cable;prestress;cable safety coefficient;allowable stress;the structural parameters;as a way for bridge;constraints;and the cable force;the static and dynamic characteristics of suspension design.
目 录
第1章 绪 论 5
1.1 选题的目的与意义 5
1.2 国内外研究的现状及存在的问题 5
1.2.1埃塔-斜拉桥国外发展情况 5
1.2.2埃塔-斜拉桥国内发展情况 6
第2章 矮塔-斜拉桥的特点与发展前景 7
2.1矮塔-斜拉桥的受力特点 7
2.1.1埃塔-斜拉桥的概念