本文關(guān)鍵詞： 大跨度懸索橋 風(fēng)致振動(dòng) 抗風(fēng)穩(wěn)定性 顫振穩(wěn)定性 渦振性能 節(jié)段模型 風(fēng)洞試驗(yàn)　出處：《湖南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：懸索橋作為世界上最古老的橋型之一，其跨越能力也是所有橋型里最大的，現(xiàn)代懸索橋跨度基本都在1000m以上。1940年塔克馬(Tacoma)懸索橋風(fēng)毀事故后，工程師們開始重視工程設(shè)計(jì)中的風(fēng)致振動(dòng)問題，并展開了一系列的橋梁抗風(fēng)穩(wěn)定性研究工作。 大跨懸索橋的抗風(fēng)穩(wěn)定性研究重點(diǎn)主要在于橋梁顫振穩(wěn)定性和渦振性能方面的研究。正在籌建的張家界人行懸索橋，目前正處于初步設(shè)計(jì)階段。該橋基于美學(xué)的考慮，將主梁斷面初步擬定成了鈍體形式的斷面，主梁高跨比1/641.6667，遠(yuǎn)小于舊塔科馬橋1/348的高跨比，該橋比舊塔科馬橋更柔。張家界人行懸索橋重量也很輕，為每米3.933噸。如此輕且細(xì)長的橋梁結(jié)構(gòu)，在風(fēng)的動(dòng)力作用下，其風(fēng)致振動(dòng)問題將會(huì)是影響結(jié)構(gòu)設(shè)計(jì)的控制因素。本文以張家界人行懸索橋?yàn)楣こ瘫尘�，在現(xiàn)有顫振和渦振分析方法的基礎(chǔ)上，通過節(jié)段模型風(fēng)洞試驗(yàn)，，對大跨度懸索橋抗風(fēng)穩(wěn)定性問題進(jìn)行了研究。本論文的主要研究內(nèi)容有： 1、回顧了懸索橋的發(fā)展歷史，并對橋梁的風(fēng)致振動(dòng)現(xiàn)象做了簡要的介紹。介紹了橋梁抗風(fēng)穩(wěn)定性的分析理論，并歸納了氣動(dòng)、結(jié)構(gòu)、機(jī)械減振三個(gè)方面的風(fēng)致振動(dòng)控制措施。 2、結(jié)合張家界人行懸索橋的工程概況，進(jìn)行了初步設(shè)計(jì)方案中的顫振檢驗(yàn)風(fēng)速計(jì)算、全橋動(dòng)力特性分析及節(jié)段模型設(shè)計(jì)等準(zhǔn)備工作。 3、基于外傾式玻璃護(hù)欄的初步設(shè)計(jì)方案，通過風(fēng)洞試驗(yàn)識別了在三種氣動(dòng)措施組合工況下的8個(gè)顫振導(dǎo)數(shù)，并依此建立了張家界人行懸索橋顫振分析有限元模型，分析討論了三種氣動(dòng)措施所帶來的顫振穩(wěn)定性效果。 4、提出了一種較佳的主梁氣動(dòng)斷面形式，并對主梁的剛性節(jié)段模型進(jìn)行了抗風(fēng)性能風(fēng)洞測振試驗(yàn)研究，得到了氣動(dòng)改形后加勁梁的顫振穩(wěn)定性和渦振性能結(jié)果。
[Abstract]:As one of the oldest bridge types in the world, suspension bridge has the largest span ability of all bridges. The span of modern suspension bridges is almost more than 1000m. After the wind damage accident of Tacoma Bridge in 1940, engineers began to attach importance to the wind-induced vibration in engineering design. A series of research work on the wind-resistant stability of bridges has been carried out. The study on wind-resistant stability of long-span suspension bridge is mainly focused on the flutter stability and vortex-vibration performance of the bridge. At present, the bridge is in the preliminary design stage. Based on aesthetic considerations, the section of the main beam is initially drawn up as a blunt body section, the ratio of height to span of the main beam is 1 / 641.6667. Far less than the 1/348 height-span ratio of the old Tacoma Bridge, the bridge is softer than the old Tacoma Bridge. The suspension bridge in Zhangjiajie is also light, at 3.933 tons per meter. It is such a light and slender bridge structure. Under the dynamic action of wind, the wind-induced vibration problem will be the control factor of the structure design. This paper takes the Zhangjiajie pedestrian suspension bridge as the engineering background, based on the existing flutter and vortex vibration analysis methods. The wind-resistant stability of long-span suspension bridge is studied by wind tunnel test with segmental model. The main contents of this thesis are as follows: 1. The development history of suspension bridge is reviewed, and the wind-induced vibration phenomenon of the bridge is briefly introduced. The analysis theory of the bridge anti-wind stability is introduced, and the aerodynamic and structure are summarized. Control measures of wind-induced vibration in three aspects of mechanical vibration reduction. 2. Combined with the general situation of Zhangjiajie pedestrian suspension bridge, the flutter test wind speed calculation, the dynamic characteristic analysis of the whole bridge and the design of the segmental model are carried out in the preliminary design scheme. 3. Based on the preliminary design scheme of extroverted glass guardrail, eight flutter derivatives are identified by wind tunnel test under the combined working conditions of three kinds of pneumatic measures. A finite element model for flutter analysis of Zhangjiajie pedestrian suspension bridge is established, and the flutter stability effect brought by three kinds of pneumatic measures is analyzed and discussed. 4. A better aerodynamic section form of the main beam is proposed, and the wind tunnel vibration test of the rigid segment model of the main girder is carried out. The flutter stability and vortex vibration performance of the stiffened beam are obtained.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.25;U441.3

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