不同工况下冲击系数的理论与试验研究
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摘要
针对桥梁动载试验时实测的冲击系数较现行规范的计算值偏大的问题,指出现行桥规中冲击系数计算公式的不足.综合考虑不同工况、桥梁基频和车辆激励频率3个因素的影响,提出了比现行规范公式更能准确描述车桥系统动力特性的修正公式,并利用邓氏渡大桥的实测数据进行了验证,其计算精度有了显著的提高.该修正公式可为将来公路桥梁规范的进一步完善提供参考.
The test data of dynamic load of bridge about impact coefficient nowadays was usually much bigger than the one calculated in the Bridge Specifications,which show that the calculating formulation of impact coefficient in the Bridge Specifications was defective.The working condition,bridge fundamental frequency and excitation frequency of entire truck were taken into consideration,then the correcting calculating formulation of impact coefficient was put forward,which was more accurate and verified by the test data of Dengshidu Bridge.The correcting calculating formulation of impact coefficient is effective for improving the Bridge Specifications in the future.
The test data of dynamic load of bridge about impact coefficient nowadays was usually much bigger than the one calculated in the Bridge Specifications,which show that the calculating formulation of impact coefficient in the Bridge Specifications was defective.The working condition,bridge fundamental frequency and excitation frequency of entire truck were taken into consideration,then the correcting calculating formulation of impact coefficient was put forward,which was more accurate and verified by the test data of Dengshidu Bridge.The correcting calculating formulation of impact coefficient is effective for improving the Bridge Specifications in the future.
引文
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[3]禹建兵.斜拉桥地震响应特点及抗震设防标准的探讨[J].湖南科技大学学报(自然科学版),2011,26(4):51-54.Yu J B.Discussion on seismic response and seismic fortification criterion of cable-stayed bridge[J].Journal of Hunan University of science and Technology(Natural Science Edition),2011,26(4):51-54.
[4]Harris N K,OBrien E J,Gonzlez A.Reduction of bridge dynamic amplification through adjustment of vehicle suspension damping[J].Journal of Sound and Vibration,2007,302(3):471-485.
[5]Yau J D.Dynamic response analysis of suspended beams subjected to moving vehicles and multiple support excitations[J].Journal of Sound and Vibration,2009,325(4-5):907-922.
[6]中华人民共和国交通部标准.公路桥涵设计通用规范(JTJ021-89)[S].北京:人民交通出版社,1997.Department of Transportation of People’s Republic of China.Bridge Designing Specifications(JTJ021-89)[S].Beijing:People's Communication Press,1997.
[7]中华人民共和国交通部标准.公路桥涵设计通用规范(JTG D60-2004)[S].北京:人民交通出版社,2004.Department of Transportation of People’s Republic of China.Bridge Designing Specifications(JTG D60-2004)[S].Beijing:People's Communication Press,2004.
[8]沈明燕,谢献忠,石卫华,等.杨梅洲大桥荷载试验检测报告[R].湘潭:湖南科技大学工程检测中心,2012.Shen M Y,Xie X Z,Shi W H,et al.The loading test report of Yangmeizhou Bridge[R].Xiangtan:Engineering testing centre of Hunan University of Science and Technology,2012.
[9]傅春红.某中型卡车振动问题的研究与系统解决[D].合肥:合肥工业大学,2010.Fu C H.research and systematic resolve about the vibration problem of medium-size truck[D].HeFei:HeFei University of Technology,2010.
[10]沈明燕,谢献忠,石卫华,等.邓氏渡大桥荷载试验检测报告[R].湘潭:湖南科技大学工程检测中心,2012.Shen M Y,Xie X Z,Shi W H,et al.The loading test report of Dengshidu Bridge[R].Xiangtan:Engineering testing centre of Hunan University of Science and Technology,2012.
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