【摘要】：摘要：我國每年約有10次臺風登陸,風災頻繁發(fā)生并嚴重威脅著人民群眾的生命和財產(chǎn)安全,而大跨度橋梁是生命線工程,對于一些難以跨域的地形顯得尤為重要,因此對大跨度橋梁結(jié)構(gòu)的抗風研究工作非常重要。 目前,使用比較廣泛的是使用頻域法求解橋梁風響應(yīng),該方法目前已經(jīng)可以完備地解決線性問題,而實際工程中總是不可避免地出現(xiàn)幾何、材料及接觸非線性問題。這都致使頻域分析方法只能進行近似計算,其結(jié)果與解析解之間產(chǎn)生不可避免的差距。這時應(yīng)考慮使用時程分析方法,采用可接受的精度來研究此類問題。 本文針對頻域分析方法的不足之處,首先研究了隨機模擬方法,編制了適合模擬脈動風速時程的FORTRAN程序,模擬出了具有空間相關(guān)性的六維脈動風速時程,從而為后續(xù)的多跨連續(xù)梁橋的風響應(yīng)分析做了必要準備；其次,歸納了目前常用的數(shù)值積分方法,并對各種方法的優(yōu)點和不足進行了合理評價。最后利用模擬的脈動風速時程與工程實地的平均風資料計算風荷載,再利用計算的風荷載通過Newmark-β數(shù)值積分方法,計算了多跨連續(xù)梁橋的非一致激勵下的風致抖振響應(yīng)時程,并與頻域法得到的結(jié)果進行了對比,發(fā)現(xiàn)了二者之間有較大的差別,從而為大跨度橋梁的抗風設(shè)計工作和橋梁風災的治理工作提供了可以參考的方法和結(jié)論。圖45幅,表23個,參考文獻
[Abstract]:Absrtact: there are about 10 typhoons landing every year in China. Wind disasters occur frequently and threaten the lives and property of the people seriously. The long-span bridges are lifeline projects, which are especially important for the terrain which is difficult to cross the region. Therefore, it is very important to study the wind resistance of long-span bridge structures. At present, the frequency-domain method is widely used to solve the wind response of bridges. This method can solve the linear problem completely. However, geometric, material and contact nonlinear problems are always inevitable in practical engineering. As a result, the frequency domain analysis method can only be approximately calculated, and there is an inevitable gap between the results and the analytical solution. We should consider using time history analysis method and adopt acceptable precision to study this kind of problem. Aiming at the shortcomings of the frequency domain analysis method, this paper first studies the stochastic simulation method, compiles the FORTRAN program suitable for simulating the fluctuating wind speed time history, and simulates the six dimensional fluctuating wind speed time history with spatial correlation. Therefore, it is necessary to prepare for the wind response analysis of the multi-span continuous girder bridge. Secondly, the common numerical integration methods are summarized, and the advantages and disadvantages of these methods are evaluated reasonably. Finally, the wind load is calculated by using the simulated pulsating wind velocity time history and the average wind data in the engineering field. Then, the wind-induced buffeting response time history of a multi-span continuous beam bridge under non-uniform excitation is calculated by using the Newmark- 尾 numerical integral method. Compared with the results obtained by the frequency-domain method, it is found that there is a great difference between the two methods, thus providing a reference method and conclusion for the wind-resistant design of long-span bridges and the management of bridge wind disasters. 45 figures, 23 tables, references
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.215;U441.3

【參考文獻】

相關(guān)期刊論文 前3條

1 楊向龍;;CFD技術(shù)在流動相似性原理教學中的應(yīng)用[J];中國現(xiàn)代教育裝備;2012年07期

2 項海帆;葛耀君;;現(xiàn)代橋梁抗風理論及其應(yīng)用[J];力學與實踐;2007年01期

3 韋勇,陳國平;結(jié)構(gòu)非比例阻尼矩陣的建模和識別[J];南京航空航天大學學報;2004年06期

，

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