混凝土曲线箱梁桥特征频率的参数分析
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摘要
利用梁格模型建立曲线箱梁桥的动力计算模型,分析了跨径比、跨宽比、曲率半径及端横梁宽度等参数对其动力特性的影响,得到各参数对结构特征频率的影响规律.在等截面直梁竖弯频率理论计算公式基础上,通过回归分析,建立了等截面曲线箱梁桥一阶竖弯频率的近似计算公式.
The effect of span-to-span ratio,aspect ratio,radius of curvature and thickness of end-diaphragm on dynamic characteristics of curved ontinuous box beam bridges is investigated with FE method using beam-gird model.Conclusions for the effects of each paremeter on the dominant frequencies of the curved box beam bridges are drawn from the analytical invsetigation.Based on the theoretical formula for the straight beam with a uniform cross-section,an empirical formula for calculating the first vertical flexural frequency of the curved box beam bridge with a uniform cross-section is proposed from regression analysis.
The effect of span-to-span ratio,aspect ratio,radius of curvature and thickness of end-diaphragm on dynamic characteristics of curved ontinuous box beam bridges is investigated with FE method using beam-gird model.Conclusions for the effects of each paremeter on the dominant frequencies of the curved box beam bridges are drawn from the analytical invsetigation.Based on the theoretical formula for the straight beam with a uniform cross-section,an empirical formula for calculating the first vertical flexural frequency of the curved box beam bridge with a uniform cross-section is proposed from regression analysis.
引文
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[2]Sennah KM,Kennedy J B.State-of-the-art in design of curved box-girder bridges[J].ASCE Journal of Bridge Engineer-ing,2001,6(3):159-167.
[3]Sennah K M,Kennedy J B.Literature review in analysis of box-girder bridges[J].ASCE Journal of Bridge Engineering,2002,7(2):134-143.
[4]Heins C P,Sahin M A.Natural frequency of curved box girder bridges[C]//Proceeding of the American Society of Civil Engi-neering,1979,105(ST12):2591-2600.
[5]谢志英,濮中标.混凝土曲线梁桥的自振频率分析[J].西部矿探工程,2005(12):208-209.
[6]占玉林,赵人达.连续弯梁桥特性分析[J].四川建筑,2004,24(1):42-43.
[7]王丽,周锡元,闫维明.曲线梁桥地震响应的简化分析方法[J].工程力学,2006,23(6):77-84.
[8]Sennah K M,Kennedy J B.Vibrations of horizontally curved continuous composite cellular bridges[J].Can J Civ Eng,1998,25:139-150.
[9]范立础.桥梁工程[M].北京:人民交通出版社,2002.
[10]周勇军,赵小星,贺拴海,等.弯钢箱梁桥的动力分析及模态试验[J].郑州大学学报:工学版,2002,26(4):20-24.
[11]王光林.箱形梁的梁格分析法[J].山西建筑,2005,31(4):33-34.
[12]Yoon Ki-Young,Kang Young-Jong,Choi Young-Joon,et al.Free vibration analysis of horizontally curved steel igirderbridges[J].Thin-walled Structures,2005,43:679-699.
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