典型桥梁断面的二维抖振响应分析
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摘要
通过刚体节段模型高频天平测力法,在优化谱估计参数的基础上,采用互功率谱方法对桥梁闭口箱梁断面的全部6个气动导纳函数进行识别,分析了导纳函数的变化特点;利用识别的气动力参数对闭口箱梁断面进行二维桥梁抖振分析,发现闭口箱梁取实测导纳的响应计算结果远小于导纳函数取1.0的计算值,且导纳取Sears函数的计算结果偏于保守,桥梁断面运动过程中系统阻尼的增加抑制了竖向及扭转抖振响应,在一般风洞试验中使用模拟二维二自由度的节段模型试验,其风洞试验结果应该是偏于安全的.
By using the high frequency force balance and correlation spectrum method,all the six aerodynamic admittances of box girder model were identified on the basis of the optimization of the parameters of spectral estimation.The characteristics of admittance function were analyzed.Two dimensional buffeting response of bridge box girder section were calculated by use of the identified aerodynamic parameters.It shows that the calculation results with actual admittance are far less than the value when the aerodynamic admittance replaced by one.The wind-induced responses for the big box beam model obtained conservative results when the admittance replaced by the Sears function.The system damping during the bridge section's exercise can inhibit the vertical and torsion wind-induced response.The test results in the two degree and two-dimensional section model tests in wind tunnel should be on the safe side.
By using the high frequency force balance and correlation spectrum method,all the six aerodynamic admittances of box girder model were identified on the basis of the optimization of the parameters of spectral estimation.The characteristics of admittance function were analyzed.Two dimensional buffeting response of bridge box girder section were calculated by use of the identified aerodynamic parameters.It shows that the calculation results with actual admittance are far less than the value when the aerodynamic admittance replaced by one.The wind-induced responses for the big box beam model obtained conservative results when the admittance replaced by the Sears function.The system damping during the bridge section's exercise can inhibit the vertical and torsion wind-induced response.The test results in the two degree and two-dimensional section model tests in wind tunnel should be on the safe side.
引文
[1]中华人民共和国交通部.JTG/T D60-01-2004公路桥梁抗风设计规范[S].北京:人民交通出版社,2004.
[2]SARKAR P P.New identification methods applied to the response of flexible bridges to wind[D].Baltimore:Johns Hopkins University,1992.
[3]SCANLAN R H,TOMKO J J.Airfoil and bridges deck futter derivatives[J].Journal of Engineering Mechanics,ASCE,1971,97(6):1717-1737.
[4]LIEPMANN H W.On the application of statistical concepts to the buffeting problem[J].Journal of Aeronautical Science,1952,19(12):793-800.
[5]DAVENPORT A G.The application of statistical concepts to the wind loading of structures[J].Proceeding of the Institution of Civil Engineers,1961,19(8):449-472.
[6]靳欣华.桥梁断面气动导纳识别理论及试验研究[D].上海:同济大学,2003.
[7]李桂青,曹宏,李秋胜,等.结构动力可靠性理论及其应用[M].北京:地震出版社,1993.
[8]薛年喜.MATLAB在数字处理信号中的应用[M].北京:清华大学出版社,2010.
[9]丁泉顺.大跨度桥梁耦合颤抖振响应的精细化分析[D].上海:同济大学,2001.
[10]潘韬.桥梁非定常气动力模型及其风振响应分析[D].上海:同济大学,2013.
[11]张冠华,赵林,葛耀君,等.流线型闭口箱梁断面风荷载空间相关性试验研究[J].振动与冲击,2012,31(2):76-80,114.
[12]刘志文,胡建华,陈政清,等.闭口箱开主梁断面三分力系数二维大涡模拟[J].公路交通科技,2011,28(11):61-66.
[13]曹丰产,项海帆,陈艾荣,等.桥梁断面的气动导数和颤振临界风速的数值计算[J].空气动力学学报,2000,18(1):26-33.
[14]郭增伟,赵林,葛耀君,等.基于桥梁断央压力分布统计特性的抑流板抑制涡振机理研究[J].振动与冲击,2012,31(7):89-94,117.
[2]SARKAR P P.New identification methods applied to the response of flexible bridges to wind[D].Baltimore:Johns Hopkins University,1992.
[3]SCANLAN R H,TOMKO J J.Airfoil and bridges deck futter derivatives[J].Journal of Engineering Mechanics,ASCE,1971,97(6):1717-1737.
[4]LIEPMANN H W.On the application of statistical concepts to the buffeting problem[J].Journal of Aeronautical Science,1952,19(12):793-800.
[5]DAVENPORT A G.The application of statistical concepts to the wind loading of structures[J].Proceeding of the Institution of Civil Engineers,1961,19(8):449-472.
[6]靳欣华.桥梁断面气动导纳识别理论及试验研究[D].上海:同济大学,2003.
[7]李桂青,曹宏,李秋胜,等.结构动力可靠性理论及其应用[M].北京:地震出版社,1993.
[8]薛年喜.MATLAB在数字处理信号中的应用[M].北京:清华大学出版社,2010.
[9]丁泉顺.大跨度桥梁耦合颤抖振响应的精细化分析[D].上海:同济大学,2001.
[10]潘韬.桥梁非定常气动力模型及其风振响应分析[D].上海:同济大学,2013.
[11]张冠华,赵林,葛耀君,等.流线型闭口箱梁断面风荷载空间相关性试验研究[J].振动与冲击,2012,31(2):76-80,114.
[12]刘志文,胡建华,陈政清,等.闭口箱开主梁断面三分力系数二维大涡模拟[J].公路交通科技,2011,28(11):61-66.
[13]曹丰产,项海帆,陈艾荣,等.桥梁断面的气动导数和颤振临界风速的数值计算[J].空气动力学学报,2000,18(1):26-33.
[14]郭增伟,赵林,葛耀君,等.基于桥梁断央压力分布统计特性的抑流板抑制涡振机理研究[J].振动与冲击,2012,31(7):89-94,117.
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