本文選題：管道懸索橋 + 靜風穩(wěn)定��； 參考：《西南交通大學》2015年碩士論文

【摘要】：懸索橋作為一種比較成熟的橋型,在實際工程中具有較廣的應用。常見的懸索橋跨度較大,剛度較小,在風的作用下風振效應比較顯著,但懸索橋相比其他橋型在跨越能力和經濟性能方面具有明顯優(yōu)勢。目前國內外越來越多的石油、天然氣管道的跨越結構選擇懸索橋,同普通懸索橋相比,管道懸索橋剛度更小,風振問題更加突出。本文以瀾滄江管道懸索橋為工程背景,對其顫振臨界風速、靜風穩(wěn)定性以及顫振臨界風速影響因素等方面進行分析,主要內容如下：1.利用ANSYS建模對管道懸索橋進行動力特性分析,此橋型的基頻很低,表明管道懸索橋柔性很大,并且前十階振型以豎彎和橫彎為主,扭轉發(fā)生在第十二階,表明管道懸索橋的抗扭剛度大于結構的豎向和橫向剛度,在結構設計時需要著重考慮結構的豎向及橫向形變問題。2.通過節(jié)段模型風洞試驗,得到在不同風攻角下結構的顫振臨界風速,并對結構的顫振穩(wěn)定性做出分析。3.對瀾滄江管道懸索橋的靜風穩(wěn)定性采用三維非線性有限元方法進行分析,同時研究了結構布置形式、主纜風力和風攻角對管道懸索橋靜風穩(wěn)定性的影響,得出一些實用的結論。4.通過有限元建模,分別分析了結構措施和氣動措施對管道懸索橋顫振穩(wěn)定性的影響,結構措施中,單純增加結構的截面尺寸不能有效增強結構的顫振穩(wěn)定性,抗風索以及索力的有效施加可以明顯提升結構的顫振穩(wěn)定性；氣動措施中,中央穩(wěn)定板可以提高結構的顫振穩(wěn)定性,但導流板的設置需要根據實際橋型而定。
[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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U448.25

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