基于相位角变化的桩基缺陷位置识别方法
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摘要
传统的低应变反射波信号解读方法具有很大的经验性,因而对桩身的缺陷位置常常作出错误的估计。为合理判断桩身缺陷位置,提出一种新的基于相位角变化的桩基缺陷位置改进识别方法。首先,利用解析模态分解定理和递归希尔伯特变换提取了重点关注频带范围内的反射波纯调频信号;其次,对提取的纯调频信号进行小波变换并通过相位角的变化判别桩身缺陷位置;最后,通过王乾1号大桥桩基实测数据验证了所提出方法的有效性。研究结果表明,该方法能够有效判断桩身缺陷疑似位置,为后续的缺陷位置排查提供了便利,但仍需结合其他桩基损伤识别方法和相关工程资料进行验证。
Since traditional low strain reflected wave method is essentially empirical,a misleading estimation of the damage location of pile foundations may be made.To address this issue,an improved method based on the change of phase angle is presented to detect the position where effects occur.Firstly,the analytical modal decomposition and recursive Hilbert transform are combined to extract the FM parts in a specific region of interest.Secondly,continues wavelet transform is performed on the extracted FM parts to acquire the phase angle and thus the damage is identified according to the varying of the phase angle.Finally,the measured data of the pile of Wangqian#1 Bridge is used to verify the effectiveness and accuracy of the proposed method,and the results demonstrate that the proposed method can preliminarily detect the damage location of the pile and thus facilitate the following damage confirmation,but it still needs more extra proofs based on other damage detection methods or engineering data.
Since traditional low strain reflected wave method is essentially empirical,a misleading estimation of the damage location of pile foundations may be made.To address this issue,an improved method based on the change of phase angle is presented to detect the position where effects occur.Firstly,the analytical modal decomposition and recursive Hilbert transform are combined to extract the FM parts in a specific region of interest.Secondly,continues wavelet transform is performed on the extracted FM parts to acquire the phase angle and thus the damage is identified according to the varying of the phase angle.Finally,the measured data of the pile of Wangqian#1 Bridge is used to verify the effectiveness and accuracy of the proposed method,and the results demonstrate that the proposed method can preliminarily detect the damage location of the pile and thus facilitate the following damage confirmation,but it still needs more extra proofs based on other damage detection methods or engineering data.
引文
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[10]Xu Juncai,Ren Qingwen,Shen Zhenzhong.Low strain pile testing based on synchrosqueezing wavelet transformation analysis[J].Journal of Vibroengineering,2016,18(2):813-825.
[11]罗明璋,王军民,徐菲.声频应力波实时检测分析仪[J].振动、测试与诊断,2012,32(2):292-295.Luo Mingzhang,Wang Junmin,Xu Fei,.Real-time analysis system of audio-frequency stress wave[J].Journal of Vibration,Measurement&Diagnosis,2012,32(2):292-295.(in Chinese)
[12]胡志祥,任伟新.基于递归希尔伯特变换的振动信号解调和瞬时频率计算方法[J].振动与冲击,2016,35(7):39-43.Hu Zhixiang,Ren Weixin.Vibration signal demodulation and instantaneous frequency estimation based on recursive Hilbert transformation[J].Journal of Vibration and Shock,2016,35(7):39-43.(in Chinese)
[13]Boulahbal D,Golnaraghi M F,Ismail F.Amplitude and phase wavelet maps for the detection of cracks in geared systems[J].Mechanical Systems and Signal Processing,1999,13(3):423-436.
[14]李廷,徐振华,罗俊.基桩声波透射法检测数据评判体系研究[J].岩土力学,2010,31(10):3165-3172.Li Ting,Xu Zhenhua,Luo Jun.Study of analysis method for collected data of integrity testing of piles by ultrasonic crosshole testing[J].Rock and Soil Mechanics,2010,31(10):3165-3172.(in Chinese)
[2]侯鹏,韩华,陈跃武.用反射波法进行桩基无损检测[J].中国安全科学学报,2003,13(4):38-40.Hou Peng,Han Hua,Chen Yuewu.Non-destructive inspection of pile foundation by reflection wave method[J].China Safety Science Journal,2003,13(4):38-40.(in Chinese)
[3]骆英,柳祖亭,潘宠平.小波滤波在基桩完整性测试系统中的应用研究[J].实验力学,2000,15(4):460-465.Luo Ying,Liu Zuting,Pan Chongping.Research on the wavelets filtering method used in integrity testing of foundation piles[J].Journal of Experimental Mechanics,2000,15(4):460-465.(in Chinese)
[4]张良均,王靖涛,李国成.小波变换在桩基完整性检测中的应用[J].岩石力学与工程学报,2002,21(11):1735-1738.Zhang Liangjun,Wang Jingtao,Li Guocheng.Application of wavelet transform in integrity of piles[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(11):1735-1738.(in Chinese)
[5]牟粼琳,李卓球,林佳木.低应变桩基检测模拟信号的小波分析系统研究[J].武汉理工大学学报:信息与管理工程版,2008,30(3):368-370.Mou Linlin,Li Zhuoqiu,Lin Jiamu.On wavalet analysis system of the low strain in pile testing analog[J].Journal of Wuhan University of Technology:Information and Management Engineering,2008,30(3):368-370.(in Chinese)
[6]李德庆,李澄宇,李澄海.桩基工程质量的诊断技术[M].北京:中国建筑工业出版社,2009:204-205.
[7]潘冬子,章光,马宝斌.应力波反射法测混凝土桩完整性的数值模拟及实验研究[J].公路交通科技,2004,21(9):64-69.Pan Dongzi,Zhang Guang,Ma Baobin.Numerical simulation and experimental study of stress wave reflection method for integrity test of concrete pile[J].Journal of Highway and Transportation Research and Development,2004,21(9):64-69.(in Chinese)
[8]Ni S H,Yang Y Z,Tsai P H,et al.Evaluation of pile defects using complex continuous wavelet transform analysis[J].Independent Nondestructive Testing and Evaluation,2017,87:50-59.
[9]刘景良,郑锦仰,郑文婷,等.基于改进同步挤压小波变换识别信号瞬时频率[J].振动、测试与诊断,2017,37(4):814-821.Liu Jingliang,Zheng Jinyang,Zheng Wenting,et al.Instantaneous frequency identification of signal based on improved synchrosqueezing wavelet transform.[J].Journal of Vibration,Measurement&Diagnosis,2017,37(4):814-821.(in Chinese)
[10]Xu Juncai,Ren Qingwen,Shen Zhenzhong.Low strain pile testing based on synchrosqueezing wavelet transformation analysis[J].Journal of Vibroengineering,2016,18(2):813-825.
[11]罗明璋,王军民,徐菲.声频应力波实时检测分析仪[J].振动、测试与诊断,2012,32(2):292-295.Luo Mingzhang,Wang Junmin,Xu Fei,.Real-time analysis system of audio-frequency stress wave[J].Journal of Vibration,Measurement&Diagnosis,2012,32(2):292-295.(in Chinese)
[12]胡志祥,任伟新.基于递归希尔伯特变换的振动信号解调和瞬时频率计算方法[J].振动与冲击,2016,35(7):39-43.Hu Zhixiang,Ren Weixin.Vibration signal demodulation and instantaneous frequency estimation based on recursive Hilbert transformation[J].Journal of Vibration and Shock,2016,35(7):39-43.(in Chinese)
[13]Boulahbal D,Golnaraghi M F,Ismail F.Amplitude and phase wavelet maps for the detection of cracks in geared systems[J].Mechanical Systems and Signal Processing,1999,13(3):423-436.
[14]李廷,徐振华,罗俊.基桩声波透射法检测数据评判体系研究[J].岩土力学,2010,31(10):3165-3172.Li Ting,Xu Zhenhua,Luo Jun.Study of analysis method for collected data of integrity testing of piles by ultrasonic crosshole testing[J].Rock and Soil Mechanics,2010,31(10):3165-3172.(in Chinese)