【摘要】：以中央開槽箱梁斷面斜拉橋-上海長江大橋為工程背景,首先通過格柵紊流場節(jié)段模型測力和測壓風洞試驗,研究了中央開槽箱梁斷面的非定常隨機抖振力頻譜特性和跨向相關特性;然后,借助于最小二乘擬合方法,提出了同時考慮來流紊流和特征紊流的中央開槽箱梁斷面的非定常隨機抖振力譜經(jīng)驗數(shù)學模型和抖振力跨向根方相干函數(shù)經(jīng)驗數(shù)學模型;其次在此基礎上,建立了開槽斷面斜拉橋的非定常隨機抖振響應有限元頻域數(shù)值分析方法,并應用于上海長江大橋的非定常隨機抖振響應分析;最后,把數(shù)值分析結果與氣彈模型風洞試驗結果進行了對比,以檢驗所建立方法的可行性和可靠性。
[Abstract]:Based on the cable-stayed bridge with central slotted box girder section and Shanghai Yangtze River Bridge as the engineering background, the wind tunnel test of force and pressure is first carried out through the model of grid turbulent flow field. The spectrum characteristics of unsteady random buffeting force and the cross-correlation characteristics of the central slotted box girder section are studied. Then, by means of the least square fitting method, an empirical mathematical model of unsteady random buffeting force spectrum and an empirical mathematical model of cross-root coherent function of buffeting force are proposed for the central slotted box girder section considering both the incoming turbulent flow and the characteristic turbulence. Secondly, the finite element numerical analysis method of unsteady random buffeting response of cable-stayed bridge with slotted section in frequency domain is established and applied to the unsteady random buffeting response analysis of Shanghai Yangtze River Bridge. Finally, the results of numerical analysis are compared with the results of wind tunnel test of Aeroelastic model to verify the feasibility and reliability of the established method.
【作者單位】： 汕頭大學;同濟大學土木工程防災國家重點實驗室;橋梁結構抗風技術交通行業(yè)重點實驗室;天津市市政工程設計研究院;
【基金】：國家自然科學基金(51308330) 橋梁結構抗風技術交通行業(yè)重點實驗室開放基金項目(KLWRTBMC12-01) 科技部國家重點實驗室基金資助系統(tǒng)性項目(SLDRCE08-A-02) 汕頭大學科研啟動項目(NTF12007)
【分類號】：U441.3

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