本文關鍵詞：多點地震輸入對橋梁動力反應的影響分析　出處：《華北理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 多點地震 動力反應 大跨橋梁 落梁破壞

【摘要】：大跨橋梁結構是我國交通運輸生命線上的一項不可分割的重要組成部分。目前在橋梁結構抗震領域的研究,以及探索找到更加有效的方法來抵抗地震作用下對橋梁結構的破壞一直是眾多學者們研究追求的核心目標。大跨度橋梁結構經(jīng)常是車輛行駛比較密集的交通公共場所,其抗震安全性能不能輕易的忽視。而對于大跨橋梁結構本身所具有的跨度比較大的這個特點使得其在橋梁抗震領域計算方法的研究比普通的其他結構要復雜的多,所需要考慮進去的因素也會更多。對于大跨結構地震動力響應分析大多數(shù)傳統(tǒng)的分析方法就是忽視地震動在空間范圍內的變化,即認為結構的各個支撐點處地震時地球表面運動都是相同的。然而相對于一些跨度比較大的橋梁結構,其橋梁結構延伸較長,不同橋墩支座處的高度差也比較大,應用一致地震輸入方式所得到的數(shù)據(jù)結果也不符合真實的情況。所以,推究大跨橋梁非一致地震輸入響應,擁有非常重大的理論意義和工程研究價值。根據(jù)拉格朗日方程推求了多點地震動輸入時對三跨簡支梁橋的地震動力反應計算公式,并編制了龍格-庫塔法數(shù)值求解程序。通過比較同一個橋梁模型分別在三條地震波作用下的動力反應結果可以得出同一個結論,對于大跨度橋梁結構考慮多點地震動輸入的情況下,縱梁-橋墩的相對位移明顯比一致地震輸入下有所增加,當時間間隔為0.1s時,位移增大系數(shù)可達4.96倍�？v梁質量、橋墩截面剛度及等效阻尼值對墩梁的相對位移影響較大。在大跨度橋梁結構設計時,有必要綜合考慮三者的影響,選擇最優(yōu)組合,避免發(fā)生落梁破壞。
[Abstract]:Large span bridges is an integral and important part of transportation lifeline in China. The current research in the field of bridge structure seismic exploration, and find a more effective method to resist the earthquake damage to the bridge structure has been many scholars research the core goal. The long-span bridge structure is often the vehicle traffic public places more intensive, the seismic safety performance can not be easily ignored. And the characteristics of the long-span bridge structure itself has a relatively large span in the bridge seismic field calculation method of the research is much more complicated than other ordinary structure, need into account also more. For large span structure seismic response analysis of most of the traditional methods is to ignore the seismic changes in the spatial scope, that the structure of each The earthquake at the supporting point movement of the earth's surface are the same. However, compared with some relatively large span bridge structure, the bridge structure extends longer, the height difference of different pier bearing in the application of uniform seismic input results from the do not accord with the real situation. So, to bridge the non input response consistent earthquake, has theoretical significance and value engineering research is very important. According to the calculation formula of seismic dynamic response of three span beam bridge Lagrange equation for multi point seismic input, and the Runge Kutta numerical solution procedure. By comparing with a model of bridge dynamic response results respectively in effect under three seismic waves can come to the same conclusion, for the long-span bridge structure considering ground motion input, the relative displacement of beam pier is more obvious than Uniform seismic input increased, when the time interval is 0.1s, displacement coefficient of up to 4.96 times. The longitudinal quality of pier stiffness and the damping value of relative displacement of pier and girder has great influence. In the design of long-span bridges, it is necessary to consider the influence of the three, to select the optimal combination, avoid drop beam damage.

【學位授予單位】：華北理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.55

【參考文獻】

相關期刊論文 前2條

1 王澤華;嚴鵬;;汶川地震產(chǎn)生原因及其地震動特性分析[J];四川建筑科學研究;2010年01期

2 李宏光;;大跨度大空間建筑人員疏散的性能化分析[J];科技信息;2010年34期

相關博士學位論文 前1條

1 景月嶺;基于輻射傳輸理論的高頻S波各向異性散射過程研究[D];大連理工大學;2013年

相關碩士學位論文 前1條

1 史小偉;某大跨連續(xù)剛構橋的抗震研究[D];華中科技大學;2005年

，

本文編號：1388459