【作者】 王成发；

【导师】 陈偕民；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 随着交通事业的发展以及城市化进程的加快,桥梁在日益繁忙的公路和城市道路交通中显得越来越重要,许多新颖的桥型、大跨径桥梁以及特大跨径桥梁相继出现,各种截面形式纷纷被采用,而斜拉桥以其自重轻,纵向跨越能力大,结构动力性能好等优点受到桥梁工程师和设计人员的青睐。通过设计理论的完善,施工方法的改进和新材料的应用,斜拉桥的发展正进入一个崭新时代。斜拉桥的设计自由度很大,可以通过调整索力来改变结构的受力状态。一旦结构布置确定,总能找到一组索力,它使结构在确定性荷载作用下某中反映受力性能的指标达到最优。所以合理的确定斜拉桥成桥索力是斜拉桥设计中一项十分重要的工作。如何确定斜拉桥的成桥状态,研究人员、桥梁工程师和设计人员已总结出了很多的方法,这些方法各有特点,本文以泸州长江大桥为例,在对几种方法进行初步研究的基础上,提出综合采用最小弯曲能量法和零索力法确定其成桥状态的方法。本文采用对比分析计算的方法,对主梁刚度变化,拉索垂度,混凝土收缩徐变,温度变化等因素的影响进行了分析,并指出了他们的影响程度,有助于工程师在确定成桥状态时合理的选取控制条件。本文还讨论了两个施工中遇到的实际问题,并计算分析了其影响。更多还原

【Abstract】 With the development of transportation and urbanization in an accelerating pace,bridge will play a key in both tail way and road traffic systems.To meet the need of fluent transportation,various innovations of bridge types,such as with bridge with large span and super large have been constructed in the recent years in Ching. Of the new types of bridges, The cable-stayed bridge has been widely used thanks to its small dead weighe, Large capacity of spanning in length directions, and good vibration adopting capacity so on.With improving and perfecting designing theorys, the method improvement and the new materials application being under construction, pull development of cable-stayed bridge being entering a brand-new times. The design liberty degree pulling a cable-stayed bridge is very big, can accept force state by changing structure’s coming the force adjusting a rope.Once structure arrangement can find a group of cable force , it make structure optimum reporting under determinacy load effect in some being reached by force function index. So it’s very important in the design of cable-stayed bridge to fing out the optimum cable tensions under dead loads and opinions diverge fron eath other, Tht studys and the designers have concluded many methods to determine a reasonable completed status of prestressed concrete cable stayed bridge. Each method has its character in condition. Based on primary study to several methods, this article proposes a comprehensive method that takes Minimum Bending Energy method together with Zero Tensioning Force method, or that takes Influence Matrix method together with Zero Force method. That it so called Comprehensive method.In the article there is also an analysis about the influence to the complete status of the prestressed concrete cable stayed bridge of such factors as the stiffness change of the girder and deflection of cables and concrete creep and the temperature change. This must be useful to engineer to take a reasonable stress limitation in determining the reasonable completed status.Also, we talk about two problems that we meet in the construction and analysis it.更多还原