基桩缺陷定量识别研究
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摘要
针对低应变动测技术不能定量识别基桩缺陷的问题,利用频率摄动理论对基桩进行定量识别.首先定义损伤识别参数,然后将基桩振动理论与矩阵摄动理论相结合推出基桩缺陷定量识别公式,用优化法或筛选法对公式进行求解,得出损伤识别参数,从而可以确定损伤位置和损伤程度.实验室制作5根混凝土模型桩,通过设置不同位置、不同程度的缺陷对该方法进行验证,实验结果表明,该方法既可以识别基桩的缺陷位置又可以识别基桩的缺陷程度.
Low strain reflected wave method can detect the defect location of a pile but can't detect defect severity in integrity testing.Relative to the defect position,defect severity is more important.The frequency perturbation theory is adopted to quantitatively detect the foundation pile defects in this paper.The damage identification parameters were defined at first.Then,the formulae and method of quantifying identification defects were presented by perturbation matrix and dynamics theories of foundation pile.The damage identification parameter was determined by the optimization method.At last,the accuracy and feasibility of this method were verified by model pile experiments,and the experiment results show that the method could accurately detect the severity of pile defects.
Low strain reflected wave method can detect the defect location of a pile but can't detect defect severity in integrity testing.Relative to the defect position,defect severity is more important.The frequency perturbation theory is adopted to quantitatively detect the foundation pile defects in this paper.The damage identification parameters were defined at first.Then,the formulae and method of quantifying identification defects were presented by perturbation matrix and dynamics theories of foundation pile.The damage identification parameter was determined by the optimization method.At last,the accuracy and feasibility of this method were verified by model pile experiments,and the experiment results show that the method could accurately detect the severity of pile defects.
引文
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[6]李东旭.高等结构动力学[M].北京:科学出版社,2010.
[7]杜思义,唐军,陈淮.基于摄动理论识别悬臂梁损伤方法的试验研究[J].世界地震工程,2009,25(4):64-69.
[8]杜思义.基于频率变化与单元矩阵摄动理论的结构损伤识别方法研究[D].重庆:重庆大学资源与环境工程学院,2005:43-72.
[9]EI NAGGAR,M,NOVAK M.Nonlinear axial inter-action in pile dynamics[J].Journal of GeotechnicalEngineering,1994,120(4):678-696.
[10]NOVAK M,NOGAMI T,ABOUL E.Dynamic soilreaction for plain strain case[J].Journal of the Engi-neering Mechanics Division,1978,104(4):953-959.
[2]WANG T,WANG K H,XIE K H.An analytical so-lution to longitudinal vibration of a variable moduluspile of infinite segments[J].Acta Mechanica SolidaSinica,2001,14(1):67-73.
[3]王靖涛.桩基完整性动力检测的定量分析[J].施工技术.1994,21(2):18-20.
[4]HAN Y C.Dynamic vertical response of piles in non-linear soil[J].Journal of Geotechnical and Geoenvir-onmental Engineering,1997,123(8):710-716.
[5]徐斌,高跃飞,余龙.MATLAB有限元结构动力学分析与工程应用[M].北京:清华大学出版社,2009:106-110.
[6]李东旭.高等结构动力学[M].北京:科学出版社,2010.
[7]杜思义,唐军,陈淮.基于摄动理论识别悬臂梁损伤方法的试验研究[J].世界地震工程,2009,25(4):64-69.
[8]杜思义.基于频率变化与单元矩阵摄动理论的结构损伤识别方法研究[D].重庆:重庆大学资源与环境工程学院,2005:43-72.
[9]EI NAGGAR,M,NOVAK M.Nonlinear axial inter-action in pile dynamics[J].Journal of GeotechnicalEngineering,1994,120(4):678-696.
[10]NOVAK M,NOGAMI T,ABOUL E.Dynamic soilreaction for plain strain case[J].Journal of the Engi-neering Mechanics Division,1978,104(4):953-959.
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