基于曲率模态和柔度曲率的梁结构损伤识别
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摘要
选用模态柔度曲率差和曲率模态差进行损伤识别研究,提出一个基于曲率模态差的新指标。首先进行混凝土简支梁和三跨连续梁的损伤识别数值算例分析,然后以钢纤维混凝土简支梁为试验对象进行试验研究,最后通过数值与试验研究分析,结果表明,对于梁结构的损伤,曲率模态差较柔度曲率差更敏感;提出的基于曲率模态差的改进指标在一定程度上可以剔除曲率模态差的某些误判。
The flexibility curvature and modal curvature were applied to the damage identification,at the same time,an improved technique based on modal curvature was proposed.The effectiveness of the several selected damage identification techniques were examined by carrying on concrete beam damage identification numerical analysis and a steel fiber reinforced concrete simple beam test.It comes to the conclusions: The modal curvature is more effective than flexibility curvature in the damage identification of beam-type structure.The improved technique based on modal curvature can eliminate some errors caused by modal curvature to a certain extent.
The flexibility curvature and modal curvature were applied to the damage identification,at the same time,an improved technique based on modal curvature was proposed.The effectiveness of the several selected damage identification techniques were examined by carrying on concrete beam damage identification numerical analysis and a steel fiber reinforced concrete simple beam test.It comes to the conclusions: The modal curvature is more effective than flexibility curvature in the damage identification of beam-type structure.The improved technique based on modal curvature can eliminate some errors caused by modal curvature to a certain extent.
引文
[1]闫桂荣,段忠东,欧进萍.基于结构振动信息的损失识别研究综述[J].地震工程与工程振动,2007,27(3):95-103.
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[8]张勇,静行,袁海庆.基于曲率模态变化率指标的结构损伤识别[J].华中科技大学学报:城市科学版,2010,27(2):82-86.
[9]Pandey A K,Biswas M.Damage Detection in Structures Using Changes in Flexibility[J].Journal of Sound and Vibra-tion,1994,169:3-17.
[10]Pandey A K,Biswars M,Samman M N.Damage Detection from Changes in Curvature Mode Shapes[J].Journal of Soundand Vibration,1991,145(2):321-352.
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[12]刘洋,段忠东,周道成.基于模态综合技术的结构有限元模型修正[J].振动、测试与诊断,2009,9(3):287-291.
[13]Li Fanchun,Li Cheng,Zhang Aifeng.Curvature Modal Analysis and Numerical Simulation in Diverse Structural DamageIdentification[J].Journal of Ship Mechanics,2006,10(6):115-120.
[14]王济,胡晓.MATLAB在振动信号处理中的应用[M].北京:水利水电出版社,2006.
[2]Zhao Jun,DeWolf John T.Sensitivity Study for Vibrational Parameters Used in Damage Detection[J].Journal of Struc-tural Engineering,1999,125(4):410-416.
[3]惠嘉,万小朋,赵美英.基于改进的模态应变能法的复合材料层合板损伤模式诊断[J].机械科学与技术,2012,31(2):201-205.
[4]邹春蓉,唐英,张三峰,等.基于模态应变能法的梁桥结构损伤识别研究[J].铁道建筑,2012(10):4-6.
[5]陈淮,禹丹江.基于曲率模态振型进行梁式桥[J].公路交通科技,2004,21(10):55-57,65.
[6]刘蕾蕾.基于曲率模态分析的梁桥损伤识别研究[D].成都:西南交通大学,2007.
[7]曹晖,Michael I Friswell.基于模态柔度曲率的损伤检测方法[J].工程力学,2006,23(4):33-38.
[8]张勇,静行,袁海庆.基于曲率模态变化率指标的结构损伤识别[J].华中科技大学学报:城市科学版,2010,27(2):82-86.
[9]Pandey A K,Biswas M.Damage Detection in Structures Using Changes in Flexibility[J].Journal of Sound and Vibra-tion,1994,169:3-17.
[10]Pandey A K,Biswars M,Samman M N.Damage Detection from Changes in Curvature Mode Shapes[J].Journal of Soundand Vibration,1991,145(2):321-352.
[11]王利恒.基于线性及非线性动力特性的桥梁结构非破损检测研究[D].北京:北京工业大学,2006.
[12]刘洋,段忠东,周道成.基于模态综合技术的结构有限元模型修正[J].振动、测试与诊断,2009,9(3):287-291.
[13]Li Fanchun,Li Cheng,Zhang Aifeng.Curvature Modal Analysis and Numerical Simulation in Diverse Structural DamageIdentification[J].Journal of Ship Mechanics,2006,10(6):115-120.
[14]王济,胡晓.MATLAB在振动信号处理中的应用[M].北京:水利水电出版社,2006.
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