多塔多跨自锚式悬索桥结构体系及中塔合理刚度取值研究

发布时间：2018-05-27 12:08

本文选题：多塔悬索桥 + 结构体系　；参考：《长沙理工大学》2015年硕士论文

【摘要】：与梁桥、拱桥、刚构桥、斜拉桥等桥型所不同,悬索桥依靠强大的主缆来承受荷载,桥梁受到的荷载通过吊索传递给主缆,再经桥塔传到地基,这样在结构上就与其他的桥型有很大不同,这样不仅能减小桥梁本身的自重荷载,还能使材料的强度得到充分地利用,从而使得悬索桥比其他桥型具有更强的跨越能力,而多塔多跨悬索桥就是在原来两塔悬索桥两个桥塔之间再多设置一个甚至多个中塔,从而使悬索桥能够实现多个主跨的连续跨越,跨越的长度得到了更大的延伸。本文以银川滨河黄河大桥(跨径布置:88+218+218+88=612m)三塔自锚式悬索桥为研究的工程背景,借助非线性有限元分析程序Midas Civil,建立了多塔多跨自锚式悬索桥的分析模型,对其总体的线形进行准确详细的分析研究,对桥梁体系和中塔的合理刚度取值进行分析研究,主要内容和研究工作如下:(1)总结了国内外多塔多跨悬索桥在历史上的发展历程,列举了国内外正在建设和已经建成的桥梁实例以及曾经提出过的主要多塔多跨悬索桥的桥梁方案,然后重点归纳出了其结构体系、力学性能、中塔刚度的合理取值以及研究中存在的问题。(2)阐述了悬索桥分析的有关理论,建立了多塔多跨自锚式悬索桥的分析模型,通过计算,得出了增大主跨长度和改变边跨和中跨长度之比对桥梁动静力性能的影响规律。(3)针对多塔多跨自锚式悬索桥中塔的刚度对悬索桥受力影响极为显著的特点,研究得出了在车辆荷载的作用下,中塔刚度取边塔刚度不同倍数时结构的动静力特性,得出了中塔合理的刚度取值,以及改变中塔刚度值的大小、中塔的相对高度和结构形式对悬索桥动力性能的影响规律。(4)研究了多塔自锚式悬索桥在是否设置中央扣、是否设置中塔弹性索、是否设置梁塔约束的情况下结构动静力特性,得出了影响规律,并且提出了设计和施工的相关建议。
[Abstract]:Unlike girder bridges, arch bridges, rigid frame bridges, cable-stayed bridges and other types of bridges, suspension bridges rely on strong main cables to withstand loads, and the loads on bridges are transmitted to the main cable through slings, and then to the foundation through the tower. In this way, the structure is quite different from other bridge types, which not only reduces the weight load of the bridge itself, but also makes full use of the strength of the material, thus making the suspension bridge have stronger span ability than other bridge types. And the multi-tower and multi-span suspension bridge is to set up one or more middle towers between the two towers of the original suspension bridge, so that the suspension bridge can realize the continuous span of multiple main spans, and the length of the span has been extended more. In this paper, based on the engineering background of the three-tower self-anchored suspension bridge of Yinchuan River Yellow River Bridge (span arrangement: 88,218,88812m), a multi-tower and multi-span self-anchored suspension bridge analysis model is established with the help of the nonlinear finite element analysis program Midas Civil. The overall line shape of the bridge is analyzed accurately and in detail, and the reasonable stiffness of the bridge system and the middle tower is analyzed and studied. The main contents and research work are as follows: 1) the history of the multi-tower and multi-span suspension bridge at home and abroad is summarized. Examples of bridges being built and completed at home and abroad and the bridge schemes of main multi-tower and multi-span suspension bridges have been proposed, and then the structural system and mechanical properties of the bridges are summarized emphatically. The analysis theory of suspension bridge is expounded, and the analysis model of multi-tower and multi-span self-anchored suspension bridge is established. The effects of increasing the length of main span and changing the ratio of side span and middle span on the dynamic and dynamic behavior of the bridge are obtained. (3) aiming at the characteristic that the stiffness of the tower in the multi-tower multi-span self-anchored suspension bridge has a very significant effect on the force of the suspension bridge, Under the action of vehicle load, the dynamic and dynamic characteristics of the structure are obtained when the stiffness of the tower is different times, and the reasonable stiffness value of the middle tower is obtained, and the magnitude of the stiffness value of the middle tower is changed. The influence of the relative height and structure form of the middle tower on the dynamic performance of the suspension bridge is studied. (4) the dynamic and dynamic characteristics of the multi-tower self-anchored suspension bridge are studied under the condition of whether the central buckle is set, whether the elastic cable of the middle tower is installed, and whether the beam tower is constrained. The influence law is obtained, and the relevant suggestions for design and construction are put forward.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.25

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