大跨度悬索桥冲击系数影响因素研究
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摘要
考虑移动车辆荷载对桥梁结构的冲击力是公路桥梁结构设计的重要内容之一.为研究大跨度公路悬索桥各构件冲击作用的影响因素及其敏感性,以官厅水库特大桥主桥为依托进行分析.基于车桥耦合振动原理,采用三轴11自由度车辆模型,分析了车速、桥面不平顺度、车重及横向加载位置对桥梁各构件冲击系数的影响.分析成果表明,桥面不平顺度对桥梁各构件冲击系数有显著影响;车速对冲击系数的影响主要与桥梁各构件的卓越振动频率有关,车速增大并不一定导致冲击系数增大;车重持续增加使冲击系数减小且减幅逐渐降低;横向加载位置的不同对各纵梁横桥向挠度冲击系数的影响有明显区别,随着汽车加载位置的靠近,各纵梁的挠度冲击系数逐渐减小;影响因素的敏感性排序为:桥面不平顺度>车速>横向加载位置>车重.
The impact force of a loaded moving vehicle on the structure of a highway bridge needs to be considered during structural design. The Guanting reservoir bridge is analyzed to determine the influencing factors of the impact coefficients of long-span highway suspension bridge components and their sensitivities. On the basis of the vehiclebridge coupled vibration principle,the influences of vehicle speed,bridge surface roughness,vehicle weight,and transverse loading position on the impact coefficient of each bridge component were analyzed using the 11 DOFs spatial vehicle model. The analysis results show that the roughness of the bridge has a significant influence on the impact coefficient of each component. The influence of speed on the impact coefficient is mainly related to the excellent vibration frequency of bridge components,and the increase in the speed of the vehicle does not necessarily lead to the increase in the impact coefficient. The increase in the vehicle weight leads to the gradual decrease in the impact coefficient. The effect of different lateral loading positions on the impact coefficient of the deflection of each beam in transverse direction is obviously different. The impact coefficient of deflection of each beam decreases as the vehicle's loading position. The sensitivity of the influencing factors is in the following order:bridge surface roughness>vehicle speed>lateral loading>vehicle weight.
The impact force of a loaded moving vehicle on the structure of a highway bridge needs to be considered during structural design. The Guanting reservoir bridge is analyzed to determine the influencing factors of the impact coefficients of long-span highway suspension bridge components and their sensitivities. On the basis of the vehiclebridge coupled vibration principle,the influences of vehicle speed,bridge surface roughness,vehicle weight,and transverse loading position on the impact coefficient of each bridge component were analyzed using the 11 DOFs spatial vehicle model. The analysis results show that the roughness of the bridge has a significant influence on the impact coefficient of each component. The influence of speed on the impact coefficient is mainly related to the excellent vibration frequency of bridge components,and the increase in the speed of the vehicle does not necessarily lead to the increase in the impact coefficient. The increase in the vehicle weight leads to the gradual decrease in the impact coefficient. The effect of different lateral loading positions on the impact coefficient of the deflection of each beam in transverse direction is obviously different. The impact coefficient of deflection of each beam decreases as the vehicle's loading position. The sensitivity of the influencing factors is in the following order:bridge surface roughness>vehicle speed>lateral loading>vehicle weight.
引文
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[11]张鹤,张治成,谢旭,等.月牙形多拱肋钢管混凝土桁架拱桥动力冲击系数研究[J].工程力学,2008(7):118-124.Zhang He,Zhang Zhicheng,Xie Xu,et al.Theoretical study on the impact factor of crescent-shaped multirib concrete filled steel tube truss arch bridges[J].Journal of Engineering Mechanics,2008(7):118-124(in Chinese).
[12]霍学晋,蒲黔辉.蝶形拱桥的动力冲击系数研究[J].振动与冲击,2014,33(1):176-182,208.Huo Xuejin,Pu Qianhui.Impact factors of butterflyshaped arch bridges[J].Journal of Vibration and Shock,2014,33(1):176-182,208(in Chinese).
[13]王贵春,张校卫.考虑车辆运行参数变化的悬索桥车激振动分析[J].铁道科学与工程学报,2017,14(7):1442-1448.Wang Guichun,Zhang Xiaowei.The analysis on vehicle-excited vibration of suspension bridge considering variation of vehicle operational parameters[J].Journal of Railway Science and Engineering,2017,14(7):1442-1448(in Chinese).
[14]郝向炜,张志,李岩,等.考虑桥面随机不平度的钢管混凝土拱桥冲击系数统计分析[J].公路交通科技,2017,34(3):80-86.Hao Xiangwei,Zhang Zhi,Li Yan,et al.Statistical analysis on impact factor of CFST arch bridge considering random roughness of bridge deck[J].Journal of Highway and Transportation Research and Development,2017,34(3):80-86(in Chinese).
[15]冀伟,邓露,何维,等.波形钢腹板PC简支箱梁桥局部与整体动力冲击系数的计算分析[J].振动与冲击,2017,36(8):22-28.Ji Wei,Deng Lu,He Wei,et al.Local and global impact factors analysis for PC box girder bridges with corrugated steel webs[J].Journal of Vibration and Shock,2017,36(8):22-28(in Chinese).
[2]王达,韩万水,黄平明,等.桥面平整度对大跨度悬索桥车桥耦合振动的影响[J].长安大学学报:自然科学版,2009,29(4):53-58.Wang Da,Han Wanshui,Huang Pingming,et al.Influence of bridge surface roughness on vehicle-bridge coupled vibration of long-span suspension bridge[J].Journal of Chang’an University:Natural Science Edition,2009,29(4):53-58(in Chinese).
[3]王小松,崔建功.大跨度悬索桥冲击系数研究[J].重庆交通大学学报:自然科学版,2013,32(增1):848-851.Wang Xiaosong,Cui Jiangong.Impact coefficient of long-span suspension bridge[J].Journal of Chongqing Jiaotong University:Natural Science,2013,32(Suppl1):848-851(in Chinese).
[4]周勇军,赵煜,贺全海,等.刚构-连续组合桥梁冲击系数多因素灵敏度分析[J].振动与冲击,2012,31(3):97-101.Zhou Yongjun,Zhao Yu,He Quanhai,et al.Mutiparameters sensitivity analysis of impact factors for rigidcontinuous combined bridge[J].Journal of Vibration and Shock,2012,31(3):97-101(in Chinese).
[5]王贵春,陈卫丽.基于车桥耦合振动的大跨度斜拉桥冲击系数研究[J].公路工程,2015,40(6):119-124.Wang Guichun,Chen Weili.The study on the impact factor of highway cable-stayed bridge with long span on the basis of vehicle-bridge coupled vibration[J].Journal of Highway Engineering,2015,40(6):119-124(in Chinese).
[6]朱劲松,邑强.中下承式拱桥吊杆应力冲击系数不均匀性研究[J].振动与冲击,2012,31(13):5-10.Zhu Jinsong,Yi Qiang.Non-uniformity of stress impact coefficient of suspenders on half-through or through arch bridge[J].Journal of Vibration and Shock,2012,31(13):5-10(in Chinese).
[7]Lei G,Moe S C.Computer simulation of dynamic interaction between vehicle and long span box girder bridges[J].Tsinghua Science and Technology,2008,13(S1):71-77.
[8]Au F T K,Cheng Y S,Cheung Y K.Effects of random road surface roughness and long-term deflection of prestressed concrete girder and cable-stayed bridges on impact due to moving vehicles[J].Computers and Structures,2001,79(8):853-872.
[9]卜建清,娄国充,罗韶湘.汽车对桥梁冲击作用分析[J].振动与冲击,2007,26(1):52-64.Bu Jianqing,Lou Guochong,Law Siuseong.Analysis of impact effects of moving vehicles on a continuous bridge[J].Journal of Vibration and Shock,2007,26(1):52-64(in Chinese).
[10]逄焕平,王建国,钱锋.大跨度悬索桥的车桥耦合振动分析[J].合肥工业大学学报:自然科学版,2011,34(1):114-118.Pang Huanping,Wang Jianguo,Qian Feng.Analysis of vehicle-bridge interaction of long span suspension bridges[J].Journal of Hefei University:Natural Science Edition,2011,34(1):114-118(in Chinese).
[11]张鹤,张治成,谢旭,等.月牙形多拱肋钢管混凝土桁架拱桥动力冲击系数研究[J].工程力学,2008(7):118-124.Zhang He,Zhang Zhicheng,Xie Xu,et al.Theoretical study on the impact factor of crescent-shaped multirib concrete filled steel tube truss arch bridges[J].Journal of Engineering Mechanics,2008(7):118-124(in Chinese).
[12]霍学晋,蒲黔辉.蝶形拱桥的动力冲击系数研究[J].振动与冲击,2014,33(1):176-182,208.Huo Xuejin,Pu Qianhui.Impact factors of butterflyshaped arch bridges[J].Journal of Vibration and Shock,2014,33(1):176-182,208(in Chinese).
[13]王贵春,张校卫.考虑车辆运行参数变化的悬索桥车激振动分析[J].铁道科学与工程学报,2017,14(7):1442-1448.Wang Guichun,Zhang Xiaowei.The analysis on vehicle-excited vibration of suspension bridge considering variation of vehicle operational parameters[J].Journal of Railway Science and Engineering,2017,14(7):1442-1448(in Chinese).
[14]郝向炜,张志,李岩,等.考虑桥面随机不平度的钢管混凝土拱桥冲击系数统计分析[J].公路交通科技,2017,34(3):80-86.Hao Xiangwei,Zhang Zhi,Li Yan,et al.Statistical analysis on impact factor of CFST arch bridge considering random roughness of bridge deck[J].Journal of Highway and Transportation Research and Development,2017,34(3):80-86(in Chinese).
[15]冀伟,邓露,何维,等.波形钢腹板PC简支箱梁桥局部与整体动力冲击系数的计算分析[J].振动与冲击,2017,36(8):22-28.Ji Wei,Deng Lu,He Wei,et al.Local and global impact factors analysis for PC box girder bridges with corrugated steel webs[J].Journal of Vibration and Shock,2017,36(8):22-28(in Chinese).