考虑桥面不平整度退化的简支梁桥冲击系数检测方法研究
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摘要
针对桥面不平整对桥梁冲击系数的影响机理,不平整度等级与冲击系数之间关系,以及桥梁冲击系数的检测方法等问题,进行了如下研究工作:基于车桥耦合振动理论编制了数值分析程序,计算研究了桥面不平整度的空间域和频域特性对冲击系数的影响方式;基于冲击系数的概率分布模型,给出了特征冲击系数这一新指标,以代表桥梁在不同不平整度等级下、采用不同保证率时冲击系数提高值的大小;最后在有障碍跑车试验法的基础上,给出了模拟不同桥面退化程度的障碍物尺寸与布置方式,提出了一种可预判桥面退化后桥梁冲击系数是否符合要求的新型检测方法,在桥梁动力检测方向上做出了一定的探索。
Aiming at the effect mechanism of bridge deck unevenness on bridge impact coefficient,the relationship between the unevenness rank and the impact coefficient and the detecting method of the impact coefficient,based on the vehicle-bridge coupled vibration theory,a numerical analysis simulation program was developed,and effect modes of both spatial and frequency domains features of the deck unevenness on the impact coefficient were numerically studied. Based on the probability distribution model of the impact coefficient,a new indicator called the feature impact coefficient was introduced to represent the increase magnitude of the impact coefficient under different unevenness ranks with different guaranteeing rates. Finally,based on the testing method of obstacle sports cars,sizes and layout modes of obstacles to simulate different deck degradation degrees were obtained,and a new detecting method to pre-judge if the bridge impact coefficient meeting the requirements after the degradation of bridge deck was proposed to conduct a certain exploration in bridge dynamic detection.
Aiming at the effect mechanism of bridge deck unevenness on bridge impact coefficient,the relationship between the unevenness rank and the impact coefficient and the detecting method of the impact coefficient,based on the vehicle-bridge coupled vibration theory,a numerical analysis simulation program was developed,and effect modes of both spatial and frequency domains features of the deck unevenness on the impact coefficient were numerically studied. Based on the probability distribution model of the impact coefficient,a new indicator called the feature impact coefficient was introduced to represent the increase magnitude of the impact coefficient under different unevenness ranks with different guaranteeing rates. Finally,based on the testing method of obstacle sports cars,sizes and layout modes of obstacles to simulate different deck degradation degrees were obtained,and a new detecting method to pre-judge if the bridge impact coefficient meeting the requirements after the degradation of bridge deck was proposed to conduct a certain exploration in bridge dynamic detection.
引文
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[19]刘献栋,邓志党,高峰.基于逆变换的路面仿真分析[J].中国公路学报,2005,18(1):122-126.LIU Xiandong,DENG Zhidang,GAO Feng.Study of simulation of road roughness based on inverse transform[J].China Journal of Highway and Transport,2005,18(1):122-126.
[2]公路桥梁荷载试验规程:JTG/T J21-01-2015[S].北京:中华人民共和国交通部,2015
[3]公路桥涵设计通用规范:JTG D60-2015[S].北京:中华人民共和国交通部,2015.
[4]沈锐利,官快,房凯.车桥耦合数值模拟桥梁冲击系数随机变量的概率分布[J].振动与冲击,2015,34(18):123-128.SHEN Ruili,GUAN Kuai,FANG Kai.Probability distribution of random variables of impact coefficient in numerical simulation of vehicle-bridge coupled vibration[J].Journal of Vibration and Shock,2015,34(18):123-128.
[5]邓露,王维.公路桥梁动力冲击系数研究进展[J].动力学与控制学报,2016,14(4):289-300.DENG Lu,WANG Wei.The research progress of bridge impact coefficient[J].Journal of Dynamics and Control,2016,14(4):289-300.
[6]杨建荣.车-桥耦合作用下公路桥梁局部振动研究[D].上海:同济大学,2007.
[7]高庆飞.移动车辆荷载作用下梁式桥动力性能设计与评价方法[D].哈尔滨:哈尔滨工业大学,2015.
[8]PESTEREV A V,BERGMAN L A,TAN C A,et al.Assessing tire forces due to roadway unevenness by the pothole dynamic amplification factor method[J].Journal of Sound and Vibration,2005,279:817-841.
[9]PESTEREV A V,BERGMAN L A,TAN C A,et al.Application of the pothole DAF method to vehicles traversing periodic roadway irregularities[J].Journal of Sound and Vibration,2005,279:843-855.
[10]OBRIEN E,LI Y Y,GONZALEZ,et al.Bridge roughness index as an indicator of bridge dynamic amplification[J].Computers and Structures,2006,84:759-769
[11]邓露,何维,王芳.不同截面类型简支梁桥动力冲击系数研究[J].振动与冲击,2015,34(14):70-75.DENG Lu,HE Wei,WANG Fang.Dynamic impact factors for simply supported bridges with different cross-section types[J].Journal of Vibration and Shock,2015,34(14):70-75.
[12]李枝军,吴晓超,徐秀丽,等.大跨桥梁行车振动测试与舒适性分析[J].振动与冲击,2014,33(21):213-217.LI Zhijun,WU Xiaochao,XU Xiuli,et al.Vibration measurement and ride comfort analysis of a long span bridge[J].Journal of Vibration and Shock,2014,33(21):213-217.
[13]FRYBA L.Vibration of solids and structures under moving loads[M].London:Thomas Telford,1999.
[14]FRYBA L.Dynamics of Railway Bridges[M].London:Thomas Telford,1996.
[15]夏禾,张楠.车辆与结构动力相互作用[M].北京:科学出版社,2005
[16]LAW S S,ZHU X Q.Bridge dynamic responses due to road surface roughness and braking of vehicle[J].Journal of Sound and Vibration,2005,282:805-830.
[17]机械振动-道路路面谱测量数据报告:GB/T 7031-2005[S].北京:中华人民共和国国家质量监督检验检疫总局,2005.
[18]MAJUMDER L,MANOHAR C S.A time-domain approach for damage detection in beam structures using vibration data with a moving oscillator as an excitation source[J].Journal of Sound and Vibration,2003,268:699-716.
[19]刘献栋,邓志党,高峰.基于逆变换的路面仿真分析[J].中国公路学报,2005,18(1):122-126.LIU Xiandong,DENG Zhidang,GAO Feng.Study of simulation of road roughness based on inverse transform[J].China Journal of Highway and Transport,2005,18(1):122-126.