刚构-连续组合桥梁冲击系数多因素灵敏度分析
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摘要
为了研究影响冲击系数的显著性因素,以某刚构-连续组合桥梁为依托工程,采用三轴二分之一车辆模型,基于通用程序建立了车桥耦合振动有限元分析模型,考虑了车桥频率比、桥面不平整度、车体质量、车辆阻尼比、行车速度、车辆行驶方式、桥梁刚度、桥跨布置和下部结构计算模式等9个影响因素,通过正交试验表研究了该桥在诸因素下结构控制截面的挠度(位移)、弯矩冲击系数,并开展了冲击系数的敏感性因素分析。结果表明,现有规范计算此类桥梁的冲击系数值偏小;车桥频率比、桥面不平整度及车辆行驶速度是影响该类桥梁冲击系数的敏感性因素,研究成果为将冲击系数定义为多因素的函数表达式指明方向。
In order to study the sensitive influencial parameters of impact factors for rigid-continuous combined bridge,finite element model for bridge-vehicle coupled vibration was set up,in which the vehicle was simplified as a three axial half-car model.The influencial parameters include the frequency ratio between bridge and vehicle,the roughness of deck,the mass of vehicle,the damping ratio of vehicle,the velocity of vehicle,the driving mode of vehicle,the rigidity of bridge,the arrangement of bridge and the soil-structure-interaction mode.Orthogonal test table was then employed to study the structural impact factors with respect to deformation and bending moment at critical sections and thus to find the sensitive parameters.The results show that the impact factor for the combined bridge calculated according to the general code for design of highway bridges and culverts tends to be lower,and the frequency ratio between bridge and vehicle,the roughness of deck and the velocity of vehicle are the sensitive parameters affecting the impact factors.Therefore the impact factor should be interpreted as a function of muti-parameters rather than only one parameter.
In order to study the sensitive influencial parameters of impact factors for rigid-continuous combined bridge,finite element model for bridge-vehicle coupled vibration was set up,in which the vehicle was simplified as a three axial half-car model.The influencial parameters include the frequency ratio between bridge and vehicle,the roughness of deck,the mass of vehicle,the damping ratio of vehicle,the velocity of vehicle,the driving mode of vehicle,the rigidity of bridge,the arrangement of bridge and the soil-structure-interaction mode.Orthogonal test table was then employed to study the structural impact factors with respect to deformation and bending moment at critical sections and thus to find the sensitive parameters.The results show that the impact factor for the combined bridge calculated according to the general code for design of highway bridges and culverts tends to be lower,and the frequency ratio between bridge and vehicle,the roughness of deck and the velocity of vehicle are the sensitive parameters affecting the impact factors.Therefore the impact factor should be interpreted as a function of muti-parameters rather than only one parameter.
引文
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[2]王明明.车辆荷载作用下高墩大跨连续刚构桥的动力反应分析[J].华东公路,2008,31(3):7-10.
[3]袁明,余钱华,颜东煌.基于车-桥系统耦合振动理论的大跨PC连续刚构桥冲击系数研究[J].中国公路学报,2008,21(1):72-77.
[4]王海城,施尚伟.桥梁冲击系数影响因素分析及偏差成因[J].重庆交通大学学报(自然科学版),2007,26(5):61-64.
[5]盛国刚,李传习,赵冰.桥梁表面不平顺对车-桥耦合振动系统动力效应的影响[J].应用力学学报,2007,24(1):124-127.
[6]伊洪建,李海超,文涛.军用桥梁冲击系数的影响因素分析[J].国防交通工程与技术,2008,(1):26-29.
[7]周勇军,全伟,贺拴海.基于正交试验的连续刚构桥地震响应敏感性因素分析[J].地震研究,2006,29(2):176-181.
[8]肖新标,沈火明.3种车桥耦合振动分析模型的比较研究[J].西南交通大学学报,2004,39(2):172-175.
[9]宋一凡,陈榕峰.基于路面不平整度的车辆振动响应分析方法[J].交通运输工程学报,2007,7(4):39-43.
[10]刘华,叶见曙.公路混凝土弯箱梁桥的动反应[J].东南大学学报(自然科学版),2006,36(2):278-282.
[11]周新平,宋一凡,贺拴海.公路曲线梁桥车桥耦合振动数值分析[J].长安大学学报(自然科学版),2009,29(6):41-46.
[12]王斌斌,叶爱君.地震作用下大跨度斜拉桥和引桥间碰撞分析[J].振动与冲击,2010,29(3):95-99,207.
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