开槽断面斜拉桥的随机抖振数值分析

发布时间：2018-10-31 10:43

【摘要】：以中央开槽箱梁断面斜拉桥-上海长江大桥为工程背景,首先通过格栅紊流场节段模型测力和测压风洞试验,研究了中央开槽箱梁断面的非定常随机抖振力频谱特性和跨向相关特性;然后,借助于最小二乘拟合方法,提出了同时考虑来流紊流和特征紊流的中央开槽箱梁断面的非定常随机抖振力谱经验数学模型和抖振力跨向根方相干函数经验数学模型;其次在此基础上,建立了开槽断面斜拉桥的非定常随机抖振响应有限元频域数值分析方法,并应用于上海长江大桥的非定常随机抖振响应分析;最后,把数值分析结果与气弹模型风洞试验结果进行了对比,以检验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.
【作者单位】：汕头大学;同济大学土木工程防灾国家重点实验室;桥梁结构抗风技术交通行业重点实验室;天津市市政工程设计研究院;
【基金】：国家自然科学基金(51308330) 桥梁结构抗风技术交通行业重点实验室开放基金项目(KLWRTBMC12-01) 科技部国家重点实验室基金资助系统性项目(SLDRCE08-A-02) 汕头大学科研启动项目(NTF12007)
【分类号】：U441.3

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