【作者】 蒋自雄；

【导师】 邵旭东； 徐恭义；

【作者基本信息】 湖南大学 ， 建筑与土木工程， 2007， 硕士

【摘要】 自锚式悬索桥结构造型美观、经济性能较好、对地形和地质状况适应性强等优点,越来越受到工程界的青睐,是城市桥梁100-400m跨径范围内极具竞争力的桥梁方案。本文依托长沙市三汊矶湘江大桥自锚式悬索桥工程,对自锚式悬索桥的一些关键技术问题进行了研究和试验。主要做了以下工作:(1)介绍了自锚式悬索桥的发展历史和国内外的应用现状,总结了自锚式悬索桥的基本构造特点和受力特征,指出了自锚式悬索桥存在问题和发展趋势;(2)全面介绍三汊矶大桥的设计、计算、施工;指出了自锚式悬索桥中存在的主要问题;(3)提出了自锚式悬索桥主缆锚固系统设计的基本原则,总结了自锚式悬索桥采用混凝土加劲梁、钢混组合加劲梁和钢加劲梁时的主缆锚固系统,归纳得出主缆锚固可采取直接锚固、混凝土结构中散开锚固、钢结构中散开锚固和环绕式锚固等不同方式;对各种锚固方式的优缺点和适用范围进行了合理评价。这对今后同类桥型的设计和施工有重要的指导作用。(4)对三汊矶自锚式悬索桥锚固结构进行了1:3.2大比例模型试验。通过与空间有限元分析结果比较分析,表明锚固结构有较强的超载能力,验证了锚固结构的安全性和可靠性。另外,针对设计存在的问题,通过计算和试验提出了合理的建议;(5)结合长沙三汊矶大桥钢箱梁进行了1:5节段模型试验,试验包括两个模型试验,一个腹板为开口加劲板,试验结果为腹板失稳破坏;另一个腹板改为闭口加劲板,试验结果为材料屈服破坏。(6)综述了国内外关于钢结构防腐的各种方法,接合我国桥梁的工程实践,三汊矶大桥采用电弧喷铝长效防腐方案,对防腐方案的寿命、经济性、工艺流程进行了详细的论证和分析。(7)利用浇注式沥青混凝土的不透水性、耐久性、抗裂性好的特点,应用于湘江三汊矶大桥钢桥面铺装下层,针对该桥的使用条件进行桥面铺装性能研究,并提出性能优良的组合铺装结构;吸收国外的施工经验,配合三汊矶大桥的实际情况,采用合理的施工工艺,使工程质量、进度得到保证。更多还原

【Abstract】 Self-anchored suspension bridge has won more and more engineering’s favors with its beauteous build, economy performance and striving adaptability of geology and topography feathers. It has become a very competitive blue print of the urban bridge with the span from 100m to 400m. Relying on the project of Sanchaji self-anchored suspension bridge, this thesis points out some key technical problems of the self-anchored suspension bridge. The main work in this thesis is described as follows:(1) This thesis introduces phylogeny and application actuality inland and abroad, summarizes the basic construction and forcing characteristic, and indicates the existed problems and developing trend of self-anchored suspension bridge.(2) This thesis introduces background of design, calculation and construction.(3)This thesis advances the design principia and concludes that the cable anchorage system of self-anchored suspension bridge can adopt the direct anchorage system like cable-supported bridge, hybrid anchorage system, deck anchorage system and loop cable anchorage system. Meanwhile, this thesis estimates the application range, advantages and disadvantages of each anchorage system, and discusses several methods of dealing with the cable’s vertical component. All above may become a direction to the deign and construction of the same type bridge.(4)A large scale (1:3.2) anchorage model is tested for the deck anchorage system design of the Sanchaji self-anchored suspension bridge. Through the experimental results and the 3-D finite element analysis results of the model, it is validates that this deck anchorage system have large overload capacity, and this system is safe and reliable. The conclusions and suggestions can direct the anchorage system design of self-anchored bridge.(5)1:5 segmental model experiment of steel box girder of SanChaJi Bridge in ChangSha City is introduced. The experiment includes two models with different structural arrangements. One is open stiffened plates for web which destroys because of local bucking, the other is U-rib stiffened plates which destroys because of material yielding. At last, the paper put forward some problem worthy of studying more in the future。(6) Various method of corrosion prevention systems for steel structure home and abroad are summarized in this paper. According to our country’s engineering practice, electric arc aluminum-Spraying long-terming corrosion is adopted in SanChaiJi bridge, and its life, economics, techniques are also analyzed in detail.(7)Taking full advantages of watertightness, durability and anti-cracking characters of gussasphalt, this kind of asphalt is selected to be the underlayer of Xiangjiang river Sanchaji Bridge pavements。According to the applied conditions of this bridge,analyzing the performance of bridge pavements, the author provided ideal pavement structure of good performance. Based on construction experience abroad and actual situation in Sanchaji Bridge, logical construction technique has been applied and thus project quality and progress gets ensured更多还原