【摘要】：電子計算機(jī)技術(shù)的應(yīng)用和新型材料的發(fā)明,極大地促進(jìn)了現(xiàn)代橋梁的發(fā)展。斜拉橋以其特有的優(yōu)勢備受青睞。在已建或在建的斜拉橋中,大都具有塔高、跨大、柔性,弱阻尼的特點,從結(jié)構(gòu)抗風(fēng)性能講,屬于風(fēng)敏結(jié)構(gòu)。在抗風(fēng)性能研究中,抖振在任何風(fēng)速下都可能發(fā)生,對施工的安全性和成橋后的行車舒適度都會產(chǎn)生較大的影響,因此歷來受到設(shè)計者的重視。本文以某公鐵兩用鋼桁斜拉橋為例,對其成橋態(tài)和施工態(tài)分別進(jìn)行抖振線性時域分析,并考察對施工態(tài)設(shè)置抗風(fēng)索的抑振效果。內(nèi)容框架有：1.斜拉橋發(fā)展及抗風(fēng)理論知識簡介。2.根據(jù)大跨度斜拉橋的構(gòu)造特點和橋址處自然風(fēng)的特性,將斜拉橋的三維脈動風(fēng)場簡化為各自獨立的一維隨機(jī)變量進(jìn)行風(fēng)場模擬。3.利用Ansys13.0建立有限元模型,并對成橋態(tài)和施工態(tài)進(jìn)行動力特性分析,通過風(fēng)洞試驗得到靜風(fēng)三分力系數(shù),并對三分力系數(shù)擬合得到各自的三分力一階導(dǎo)數(shù)。4.通過CFD軟件計算出橋塔各段的阻力系數(shù),對抖振力、氣動自激力進(jìn)行時域化處理,然后將其和靜風(fēng)力加載到某斜拉橋進(jìn)行線性抖振時域分析。5.對施工最不利狀態(tài)設(shè)置抗風(fēng)索的抑振效果的考察。
[Abstract]:The application of computer technology and the invention of new materials have greatly promoted the development of modern bridges. Cable-stayed bridges are favored for their unique advantages. In the cable-stayed bridges built or under construction, most of them have the characteristics of tower height, span, flexibility and weak damping. In the study of wind resistance, buffeting may occur under any wind speed, which will have a great impact on the safety of construction and the driving comfort after completion of the bridge, so it has always been attached importance to by designers. Taking a steel truss cable-stayed bridge as an example, the buffeting linear time domain analysis of the bridge state and the construction state is carried out, and the effect of anti-wind cable on the vibration suppression is investigated. The content frame has a: 1. Brief introduction to the Development of Cable-Stayed Bridges and the knowledge of Wind Resistance Theory. According to the structural characteristics of the long-span cable-stayed bridge and the natural wind characteristics at the bridge site, the three-dimensional pulsating wind field of the cable-stayed bridge is simplified as a one-dimensional random variable to simulate the wind field of the cable-stayed bridge. The finite element model is established by using Ansys13.0, and the dynamic characteristics of bridge and construction state are analyzed. Through wind tunnel test, the static wind three-point force coefficient is obtained, and the first derivative of each three-point force is obtained by fitting the three-point force coefficient. The drag coefficient of each section of bridge tower is calculated by CFD software, and the buffeting force and aerodynamic self-excitation force are treated in time domain, and then loaded with static wind force into a cable-stayed bridge for linear buffeting time domain analysis .5. Study on the vibration suppression effect of wind cable in the most unfavorable state of construction.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441.3;U448.27

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 司學(xué)通;郭文華;;斜拉橋最大懸臂階段抖振響應(yīng)及其對施工人員影響[J];橋梁建設(shè);2007年04期

2 徐洪濤;馬存明;廖海黎;李明水;;大跨鋼桁架梁氣動選型及氣動參數(shù)風(fēng)洞試驗研究[J];鐵道建筑;2010年10期

3 曹映泓,項海帆,周穎;大跨度橋梁隨機(jī)風(fēng)場的模擬[J];土木工程學(xué)報;1998年03期

4 曹映泓,項海帆,周穎;大跨度橋梁顫振和抖振統(tǒng)一時程分析[J];土木工程學(xué)報;2000年05期

5 鄭史雄;李永樂;陶奇;;天興洲公鐵兩用長江大橋氣動參數(shù)風(fēng)洞試驗[J];中國鐵道科學(xué);2007年02期

相關(guān)碩士學(xué)位論文 前2條

1 秦建軍;大跨度斜拉橋最大懸臂施工狀態(tài)抖振響應(yīng)及控制研究[D];湖南大學(xué);2004年

2 張晉媛;大跨度斜拉橋線性抖振時域分析[D];西南交通大學(xué);2010年

，

本文編號：2147465