机车荷载下多年冻土区桥梁桩基振动响应特征
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摘要
为研究多年冻土区机车振动荷载作用下桥梁桩基的动力响应特征,选取了多年冻土区清水河特大桥的两个桥梁桩基进行现场强震动测试.对测试数据进行加速度响应及傅里叶谱响应分析,得出桥梁桩基的振动响应衰减规律及振动能量的分布规律.在此基础上,结合有限元结构分析软件,运用瞬态动力分析法,选取一个测试桩为实例进行二维动力响应的数值计算,获得了机车过桥时桥梁桩基的位移响应及应力响应的变化规律.
In order to obtain the dynamic response characteristics of bridge pile foundation in permafrost regions under the effect of train vibration loading,strong vibration tests were carried out at two bridge pile foundations across the Qingshuihe River in permafrost region.The attenuation function of vibration response and the vibration energy distribution of the bridge pile foundation were obtained by analyzing the response of acceleration and response of Fourier Spectrum from the test data.On these in-situ test data,the dynamic finite element analysis method of transient dynamic analysis was applied to dynamic response numerical calculation on a test pile,as a case.Thus,the change rules of stress response and displacement response of the bridge pile foundation under the locomotive load are obtained.
In order to obtain the dynamic response characteristics of bridge pile foundation in permafrost regions under the effect of train vibration loading,strong vibration tests were carried out at two bridge pile foundations across the Qingshuihe River in permafrost region.The attenuation function of vibration response and the vibration energy distribution of the bridge pile foundation were obtained by analyzing the response of acceleration and response of Fourier Spectrum from the test data.On these in-situ test data,the dynamic finite element analysis method of transient dynamic analysis was applied to dynamic response numerical calculation on a test pile,as a case.Thus,the change rules of stress response and displacement response of the bridge pile foundation under the locomotive load are obtained.
引文
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[10]Wang Xinmin.The ANSYS Numerical Analysis of EngineeringStructures.Beijing:China Communication Press,2007.[王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.]
[2]Wu Zhijian,Wang Lanmin,Ma Wei,et al.Laboratory studyon dynamics parameters of frozen soil under seismic dynamicloading[J].Northwestern Seismological Journal,2003,25(3.):210-214.[吴志坚,王兰民,马巍,等.地震荷载作用下冻土的动力学参数试验研究[J].西北地震学报,2003,25(3):210-214.]
[3]Cheng Guodong.The effects of local factors on the distributionof permafrost and the inspiration to the construction of Qing-hai-Tibet Railway[J].Science in China(Series D),2003,33(6):602-607.[程国栋.局地因素对多年冻土分布的影响及其对青藏铁路设计的启示[J].中国科学(D辑),2003,33(6):602-607.]
[4]Zhang Shuzhuang.Study on mechanic Property of Frozen SoilCaused by Freeze-Thaw Effect under Static and Dynamic Load-ing[D].Beijing:Graduate University of the Chinese Academyof Sciences,2007.[张淑娟.静动荷载及冻融作用下冻土力学性质研究[D].北京:中国科学院研究生院,2007.]
[5]Xiong Wei,Liu Minggui,Zhang Qiheng,et al.Temperaturedistribution along piles in permafrost regions[J].Rock andSoil Mechanics,2009,30(6):1658-1664.[熊炜,刘明贵,张启衡,等.多年冻土区桩基温度场研究[J].岩土力学,2009,30(6):1658-1664.]
[6]Jia Yanmin,Guo Hongyu,Guo Qicheng,et al.Finite elementanalysis of bored pile-frozen soil interactions in permafrost[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(1):3134-3140.[贾艳敏,郭红雨,郭启臣.多年冻土区灌注桩桩-冻土相互作用有限元分析[J].岩石力学与工程学报,2007,26(1):3134-3140.]
[7]Wu Zhijian.Effect of Seismic loading on the pile foundationstability of“bridge-instead-of-embankment“in the Qinghai-Tibet Railway[D].Lanzhou:Cold and Arid Regions Environ-mental and Engineering Institute,Chinese Academy of Sci-ences,2009.[吴志坚.地震荷载对青藏铁路“以桥代路”桩基础稳定性影响研究[D].兰州:中国科学院寒区旱区环境与工程研究所,2009.]
[8]Zhang Sherong,Li Guanghua.Finite element analysis of pile-soil interaction under vertical loads[J].China Rural Waterand Hydropower,2005(12):51-54.[张社荣,李光华.竖向荷载下桩土相互作用的有限元分析[J].中国农村水利水电,2005(12):51-54.]
[9]Qi Liangfeng,Jian Hao,Tang Liyun.The computing model ofadopting contact element to simulate the pile-soil’s reciprocity[J].Rock and Soil Mechanics,2005,26(1):127-130.[齐良锋,简浩,唐丽云.引入接触单元模拟桩土共同作用[J].岩土力学,2005,26(1),127-130.]
[10]Wang Xinmin.The ANSYS Numerical Analysis of EngineeringStructures.Beijing:China Communication Press,2007.[王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.]
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