墙土系统模态特性的影响因素分析
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摘要
模态参数是结构损伤识别的主要指标,然而,在墙土系统损伤诊断中仍处于探索阶段,因此,文中对墙土系统模态参数的主要影响因素进行详细分析。主要讨论了墙土系统模型和土体物理力学性质等对模态参数的影响。研究结果表明:基于低应变法测试墙土系统模态参数时,墙土系统模型的边界条件、墙土接触面、岩土材料本构模型的选择对模态参数没有影响;土体剪切波速对模态频率影响最显著,土体泊松比的影响次之,而土体密度和土体阻尼比基本没有影响,其中,模态频率与剪切波速和泊松比成线性递增关系;土体物理力学性质对模态振型没有影响。通过对这些因素的分析,得到了模态参数与相关参数之间的关系,为进一步研究墙土系统损伤诊断的方法提供了一定的参考意义。
The modal parameters are the major indexes of structural damage identification.However,damage diagnosis on soil-wall system is still in the stage of exploration.Hence,the influence factors affecting the modal parameters have been in detail analyzed.The influence factors,such as soil-wall system model,physical and mechanical properties of soil and so on are discussed in this paper.The results show that: the boundary conditions,soil-wall contact,constitutive model of soil,density of soil,damp ratio of soil have no influence on modal parameters,and the shear wave velocity of soil,Poisson ratio of soil have remarkable influence on modal frequency,but they have no influence on modal shape.Among them,the relation among shear wave velocity of soil,poisson ratio with modal frequency increased linearly.Through the factors analyzed that the relationship between the modal parameters and the correlation parameter has been obtained,providing certain reference for further study of the method of damage identification on soil-wall system.
The modal parameters are the major indexes of structural damage identification.However,damage diagnosis on soil-wall system is still in the stage of exploration.Hence,the influence factors affecting the modal parameters have been in detail analyzed.The influence factors,such as soil-wall system model,physical and mechanical properties of soil and so on are discussed in this paper.The results show that: the boundary conditions,soil-wall contact,constitutive model of soil,density of soil,damp ratio of soil have no influence on modal parameters,and the shear wave velocity of soil,Poisson ratio of soil have remarkable influence on modal frequency,but they have no influence on modal shape.Among them,the relation among shear wave velocity of soil,poisson ratio with modal frequency increased linearly.Through the factors analyzed that the relationship between the modal parameters and the correlation parameter has been obtained,providing certain reference for further study of the method of damage identification on soil-wall system.
引文
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[4]谢峻,韩大建.一种改进的基于频率测量的结构损伤识别方法[J].工程力学,2004,21(1):21-25.(Xie Jun,Han Dajian.A method for structure damagedetection based on improved[J].Engineering Mechan-ics,2004,21(1):21-25.(in Chinese))
[5]张永兴,刘世安,陈建功.土体对悬臂挡墙模态的影响与应用[J].土木建筑与环境工程,2009,31(3):72-77.(Zhang Yongxing,Liu Shian,ChenJiangong.Influence on the mode of cantilever and itsapplication of soil[J].Civil and environmental engi-neering,2009,31(3):72-77.(in Chinese))
[6]刘世安,张永兴,陈建功.悬臂式挡墙系统模态试验研究[J].公路交通科技,2009,26(7):49-53.(Liu Shian,Zhang Yongxing,Chen Jiangong.Experimen-tal study on modal analysis of cantilever retaining wallsystem[J].Highway traffic science and technology,2009,26(7):49-53.(in Chinese))
[7]谷音,刘晶波,杜义欣.三维一致粘弹性人工边界及等效粘弹性边界单元[J].工程力学,2007,24(12):31-37.(Gu Yin,Liu Jingbo,Du Yixin.Thethree-dimensional viscoelastic artificial boundary andconsistent equivalent viscous spring boundary element[J].Engineering Mechanics,2007,24(12):31-37.(in Chinese))
[8]刘晶波,谷音,杜义欣.一致粘弹性人工边界及粘弹性边界单元[J].岩土工程学报,2006,28(9):1 070-1 075.(Liu Jingbo,Gu Yin,Du Yixing.Consist-ent viscous spring artificial boundary and viscous springboundary elements[J].Chinese Journal of geotechnicalengineering,2006,28(9):1 070-1 075.(in Chi-nese))
[9]徐静,李宏男,李钢,等.考虑桩-土-结构动力相互作用的输电塔地震反应分析[J].工程力学,2009,26(9):24-29.(Xu Jing,Li Hongnan,Li Gang.Analysisof seismic response of the transmission towers of pile soilstructure dynamic interaction is taken into account[J].Engineering Mechanics,2009,26(9):24-29.(in Chi-nese))
[10]王满生,周锡元,胡聿贤.桩土动力分析中接触模型的研究[J].岩土工程学报,2005,27(6):616-620.(Wang Mansheng,Zhou Xiyuan,Hu Yuxian.Studyon the contact model of soil pile dynamic interaction[J].Chinese Journal of geotechnical engineering,2005,27(6):616-620.(in Chinese))
[11]Luz E,Wallaschek J..Experimental modal analysis u-sing ambient vibration[J].The International Journal ofAnalytical and Experimental Modal Analysis,1992,7(1):29-39.
[12]Larbi N.,Lardies J..Experimental modal analysis of astructure excited by a random force[J].MechanicalSystems and Signal Processing,2000,14(2):181-192.
[13]Chiang D Y,Cheng M S.Modal parameter identifica-tion from ambient response[J].AIAA Journal,1999,37(4):513-515.
[14]傅志方,华宏星.模态分析理论与应用[M].上海:上海交通大学出版社,2000.(Fu Zhifang,Hua Hongx-ing.The modal analysis theory and Application[M].Shanghai:Chinese Journal of geotechnical engineering,2000.(in Chinese))
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