基于脉冲响应函数和虚拟脉冲响应函数的挡土墙结构损伤诊断
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摘要
为了诊断挡墙结构的损伤,基于脉冲响应函数及虚拟脉冲响应函数创建损伤特征向量谱、提出损伤识别指标。基于损伤特征向量谱和损伤指标,提出了一种用于挡墙结构的损伤诊断方法。为了验证该损伤诊断方法的可行性和有效性,对某桩板式挡墙进行了脉冲激励和环境激励下的振动测试,通过损伤特征向量谱和损伤指标诊断其损伤。试验结果表明:基于损伤特征向量谱可敏感判别挡墙损伤状态,通过损伤指标走势曲面图可有效诊断挡墙损伤位置,通过损伤指标与损伤程度间的定量关系可定量识别挡墙损伤程度。受激励影响,脉冲激励下基于脉冲响应函数的损伤指标稳定性相对较差,而环境激励下基于虚拟脉冲响应函数的损伤指标稳定性相对较强。
To diagnose damages within retaining wall structures,based on impulse response function and virtual impulse response function,the damage feature vector spectrum was created and a damage identification index was proposed. Based on the damage feature vector spectrum and damage index,a damage diagnosis method for retaining wall structures was proposed. In order to verify the feasibility and validity of this damage diagnosis method,vibration tests on a pile plate retaining wall were performed under impulse excitation and ambient excitation,the damages within the wall were diagnosed via the damage feature vector spectrum and damage index. The tests results show that the damage state of the wall can be sensitively distinguished by the damage feature vector spectrum,damage location of the wall can be validly diagnosed through the damage index trend surface,and damage intensity of the wall can be quantitatively identified through the quantitative relationship between the damage index and damage intensity.Due to the influence of excitations,the stability of the damage index which is based on the impulse response function is poor relatively under impulse excitation,while the stability of the damage index which is based on the virtual impulse response function is much better under ambient excitation.
To diagnose damages within retaining wall structures,based on impulse response function and virtual impulse response function,the damage feature vector spectrum was created and a damage identification index was proposed. Based on the damage feature vector spectrum and damage index,a damage diagnosis method for retaining wall structures was proposed. In order to verify the feasibility and validity of this damage diagnosis method,vibration tests on a pile plate retaining wall were performed under impulse excitation and ambient excitation,the damages within the wall were diagnosed via the damage feature vector spectrum and damage index. The tests results show that the damage state of the wall can be sensitively distinguished by the damage feature vector spectrum,damage location of the wall can be validly diagnosed through the damage index trend surface,and damage intensity of the wall can be quantitatively identified through the quantitative relationship between the damage index and damage intensity.Due to the influence of excitations,the stability of the damage index which is based on the impulse response function is poor relatively under impulse excitation,while the stability of the damage index which is based on the virtual impulse response function is much better under ambient excitation.
引文
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[2]徐华东,王立海,胡志栋.运用曲率模态技术的木梁损伤定量识别[J].振动、测试与诊断,2011,31(1):110-114.XU H D,WANG L H,HU Z D.Quantitative identification of wood beam using modal curve theory[J].Journal of Vibration,Measure&Diagnosis,2011,31(1):110-114.
[3]LEE U,SHIN J.A structural damage identification method for plate structures[J].Engineering Structures,2002,24(9):1177-1188.
[4]ZHANG X Z,YAO W J,CHEN B,et al.Damage identification of a pile based on vibration characteristics[J].The Scientific World Journal,2014:1-8.
[5]WANG X,WEI B H,ZHAO B M.Damage alarming analysis for ancient wood structures based on wavelet packet energy spectrum[J].Multidiscipline Modeling in Materials and Structures,2014,10(4):593-610.
[6]NOH H,RAJAGOPAL R,KIREMIDJIAN A S.Sequential structural damage diagnosis algorithm using a change point detection method[J].Journal of Sound and Vibration,2013,332(24):6419-6433.
[7]MEKJAVIC I.Damage identification of bridges from vibration frequencies[J].Tehnicki Vjesnik-Technical Gazette,2013,20(1):155-160.
[8]战家旺,王伟,张楠,等.基于模型修正理论的铁路桥墩损伤定量评估方法[J].中国铁道科学,2015,36(5):28-35.ZHAN J W,WANG W,ZHANG N,et al.Quantitative damage evacuation method for railway piers based on model updating theory[J].China Railway Science,2015,36(5):28-35.
[9]于菲,刁延松,佟显能,等.基于振型差值曲率与神经网络的海洋平台结构损伤识别研究[J].振动与冲击,2011,30(10):183-187.YU F,DIAO Y S,TONG X N,et al.Damage identification on an offshore platform based on curvature of modal shape difference and BP neural network[J].Journal of Vibration and Shock,2011,30(10):183-187.
[10]LIU L B,ZHANG Y X,CHEN J G,et al.Damage Identification of cantilever retaining wall based on modal mean curvature difference[J].Electronic Journal of Geotechnical Engineering,2012,17:3117-3127.
[11]刘礼标,张永兴,陈建功.改进多种群遗传算法在墙土系统损伤识别中的应用[J].土木建筑与环境工程,2013,35(3):1-6.LIU L B,ZHANG Y X,CHEN J G.Application of improved multi-population genetic algorithm to damage identification of soil-wall system[J].Journal of Civil,Architecture and Environmental Engineering,2013,35(3):1-6.
[12]XU Q,CHEN J G.Damage identification investigation on retailing wall structures[J].Journal of Information and Computational Science,2015,12(13):5119-5131.
[13]徐乾,陈建功.基于损伤特征向量谱的桩板式挡土墙损伤预警[J].中南大学学报(自然科学版),2016,47(6):2053-2057.XU Q,CHEN J G.Damage alarming on pile plate retaining wall based on damage character vector spectrum[J].Journal of Central South University(Science and Technology),2016,47(6):2053-2057.
[14]XU Q.Damage identification investigation of retaining wall structures based on a virtual impulse response function[J].Shock and Vibration,2016:1-13.
[15]丁幼亮,李爱群,邓扬.小波包分析和信息融合在结构损伤预警中的联合应用[J].工程力学,2010,27(8):72-76.DING Y L,LI A Q,DENG Y.Combined application of wavelet packet analysis and information fusion on structural damage alarming[J].Engineering Mechanics,2010,27(8):72-76.
[16]常鹏,杨娜,张国培.多分辨率分析和小波能量曲率的框架结构损伤识别[J].哈尔滨工业大学学报,2016,48(6):170-176.CHANG P,YANG N,ZHANG G P.Damage identification of the frame structure based on multi-resolution analysis and wavelet energy curvature[J].Journal of Harbin Institute of Technology,2016,48(6):170-176.
[17]刘习军,商开然,张素侠,等.基于改进小波包能量的梁式结构损伤识别[J].振动与冲击,2016,35(13):179-185.LIU X J,SHANG K R,ZHANG S X,et al.Damage detection method for beam structures based on improved Wavelet Packet energy[J].Journal of Vibration and Shock,2016,35(13):179-185.
[18]李爱群,丁幼亮.工程结构损伤识别理论及应用[M].北京:科学出版社,2006:30-38.LI A Q,DING Y L.Engineering structures damage alert theory and application[M].Beijing:Science Press,2006:30-38.
[19]安永辉.基于振动信息的结构损伤识别的集中新方法[D].大连:大连理工大学,2013.AN Y H.Several new methods for Vibration-based damage identification of structures[D].Dalian:Dalian University of Technology,2013.