本文關(guān)鍵詞：大跨度公鐵兩用斜拉橋風(fēng)致抖振時域分析及擋風(fēng)屏影響研究　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大跨度公鐵兩用斜拉橋 氣動導(dǎo)納 抖振響應(yīng) 脈動風(fēng)場 擋風(fēng)屏 時域分析

【摘要】：隨著鐵路建設(shè)新時代的到來,公鐵兩用的大跨度橋梁逐漸增多,斜拉橋在這一領(lǐng)域的角色也愈加重要。而鐵路運(yùn)營速度和安全性要求的增加,風(fēng)對橋梁結(jié)構(gòu)的作用和橋梁結(jié)構(gòu)的抗風(fēng)性能也受到更多重視,抖振響應(yīng)是橋梁結(jié)構(gòu)風(fēng)致響應(yīng)中典型振動響應(yīng)之一,其會對橋梁結(jié)構(gòu)造成的行車舒適問題和疲勞破壞,有必要對此進(jìn)行研究。同時,出于改善和提高橋上行車安全的考慮,在橋上設(shè)置擋風(fēng)屏是十分有效的途徑之一,但設(shè)置擋風(fēng)屏后,可能會對橋梁結(jié)構(gòu)產(chǎn)生不利的影響,因此研究設(shè)置擋風(fēng)屏對橋梁抖振響應(yīng)的影響也是本文的重要議題之一。本文以某大跨度公鐵兩用斜拉橋?yàn)楣こ虒?shí)例,對其進(jìn)行抖振響應(yīng)分析計(jì)算。具體包括以下幾個方面：1.闡述了橋梁風(fēng)工程基本理論以及橋梁結(jié)構(gòu)三維抖振響應(yīng)的計(jì)算理論,針對大跨度公鐵兩用橋梁的特點(diǎn)和橋位處風(fēng)特性,對其三維風(fēng)場進(jìn)行簡化模擬。2.基于XNJD-1風(fēng)洞的節(jié)段段模型試驗(yàn)所得到三分力系數(shù),計(jì)算出風(fēng)對橋梁結(jié)構(gòu)的靜力和動力荷載,并進(jìn)行時域化處理,從而實(shí)現(xiàn)在有限元軟件中加載。3.利用ANSYS軟件建立該橋梁的有限元模型,進(jìn)行抖振時域分析,分析討論了是否考慮氣動導(dǎo)納和是否設(shè)置擋風(fēng)屏對結(jié)構(gòu)抖振性能的影響。4.總結(jié)了在本文中所做的研究工作,并將所得成果以圖片和表格的形式給出,最后陳述出進(jìn)一步需要進(jìn)行研究的方法和注意的問題。
[Abstract]:With the arrival of a new era of railway construction, the number of large-span bridges for both road and rail is gradually increasing, and the role of cable-stayed bridges in this field is becoming more and more important. More attention has been paid to the effect of wind on bridge structure and the anti-wind performance of bridge structure. Buffeting response is one of the typical vibration responses of bridge structure. It is necessary to study the problem of driving comfort and fatigue damage caused by the bridge structure. At the same time, it is necessary to improve and improve the safety of driving on the bridge. It is one of the most effective ways to install the windscreen on the bridge, but the installation of the windshield may have a negative effect on the bridge structure. Therefore, it is also one of the important topics in this paper to study the effect of installing windscreen on buffeting response of bridges. In this paper, a large span double-purpose cable-stayed bridge is taken as an engineering example. The buffeting response is analyzed and calculated, including the following aspects: 1. The basic theory of bridge wind engineering and the calculation theory of three-dimensional buffeting response of bridge structure are expounded. According to the characteristics of the large-span dual-purpose bridge and the wind characteristics at the bridge location, the three-dimensional wind field of the bridge is simplified. 2. The three-point force coefficient is obtained by the segmental model test based on XNJD-1 wind tunnel. The static and dynamic loads of the bridge structure caused by wind are calculated, and the time-domain treatment is carried out to realize the loading of .3.The finite element model of the bridge is established by using ANSYS software. The buffeting time domain analysis is carried out, and the effects of aerodynamic admittance and windshield on buffeting performance are discussed. 4. The research work done in this paper is summarized. The results are given in the form of pictures and tables. Finally, the methods and problems needing further research are stated.
【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2條

1 曾憲武,韓大建;大跨橋梁風(fēng)致抖振時域分析及在ANSYS中的實(shí)現(xiàn)[J];橋梁建設(shè);2004年01期

2 項(xiàng)海帆,陳偉,顧明;橋梁抖振反應(yīng)譜的實(shí)用計(jì)算方法[J];土木工程學(xué)報(bào);1995年03期

相關(guān)碩士學(xué)位論文 前1條

1 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：1413853