管道悬索桥抗风稳定性研究

发布时间：2018-06-26 03:32

本文选题：管道悬索桥 + 静风稳定　；参考：《西南交通大学》2015年硕士论文

【摘要】：悬索桥作为一种比较成熟的桥型,在实际工程中具有较广的应用。常见的悬索桥跨度较大,刚度较小,在风的作用下风振效应比较显著,但悬索桥相比其他桥型在跨越能力和经济性能方面具有明显优势。目前国内外越来越多的石油、天然气管道的跨越结构选择悬索桥,同普通悬索桥相比,管道悬索桥刚度更小,风振问题更加突出。本文以澜沧江管道悬索桥为工程背景,对其颤振临界风速、静风稳定性以及颤振临界风速影响因素等方面进行分析,主要内容如下：1.利用ANSYS建模对管道悬索桥进行动力特性分析,此桥型的基频很低,表明管道悬索桥柔性很大,并且前十阶振型以竖弯和横弯为主,扭转发生在第十二阶,表明管道悬索桥的抗扭刚度大于结构的竖向和横向刚度,在结构设计时需要着重考虑结构的竖向及横向形变问题。2.通过节段模型风洞试验,得到在不同风攻角下结构的颤振临界风速,并对结构的颤振稳定性做出分析。3.对澜沧江管道悬索桥的静风稳定性采用三维非线性有限元方法进行分析,同时研究了结构布置形式、主缆风力和风攻角对管道悬索桥静风稳定性的影响,得出一些实用的结论。4.通过有限元建模,分别分析了结构措施和气动措施对管道悬索桥颤振稳定性的影响,结构措施中,单纯增加结构的截面尺寸不能有效增强结构的颤振稳定性,抗风索以及索力的有效施加可以明显提升结构的颤振稳定性；气动措施中,中央稳定板可以提高结构的颤振稳定性,但导流板的设置需要根据实际桥型而定。
[Abstract]:As a mature bridge, suspension bridge is widely used in practical engineering. The common suspension bridges have larger span and smaller stiffness, and the wind-induced vibration effect is obvious under the action of wind, but the suspension bridges have obvious advantages over other bridges in terms of span capacity and economic performance. At present, more and more oil and gas pipelines choose suspension bridge. Compared with ordinary suspension bridge, the stiffness of pipeline suspension bridge is smaller and the problem of wind vibration is more prominent. In this paper, the critical flutter wind speed, static wind stability and the influencing factors of flutter critical wind speed are analyzed with Lancang River suspension bridge as the engineering background. The main contents are as follows: 1. The dynamic characteristics of the pipeline suspension bridge are analyzed by ANSYS modeling. The fundamental frequency of the bridge is very low, which indicates that the pipeline suspension bridge is flexible, and the first ten modes are mainly vertical and transverse bending, and the torsion occurs in the twelfth order. It is shown that the torsional stiffness of the pipeline suspension bridge is greater than that of the vertical and lateral stiffness of the structure, and the vertical and transverse deformation problem of the structure should be considered in the design of the structure. The critical flutter wind speed of the structure under different wind attack angles is obtained by the segmental model wind tunnel test, and the flutter stability of the structure is analyzed. The static wind stability of Lancang River pipeline suspension bridge is analyzed by three dimensional nonlinear finite element method. At the same time, the influence of structure layout, main cable wind force and wind attack angle on the static wind stability of the pipeline suspension bridge is studied, and some practical conclusions are drawn. Through finite element modeling, the effects of structural measures and aerodynamic measures on flutter stability of pipeline suspension bridge are analyzed respectively. In the structural measures, simply increasing the section size of the structure can not effectively enhance the flutter stability of the structure. The effective application of wind cable and cable force can obviously improve the flutter stability of the structure, and the central stabilizing plate can improve the flutter stability of the structure, but the configuration of the guide plate should be based on the actual bridge type.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.25

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