改进曲率模态识别桥梁损伤位置方法研究
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摘要
结构健康监测和结构状态评估的主要前提之一是结构损伤识别。基于曲率模态对结构局部损伤比较敏感和频率指标测试简单方便、精度高的特点,本文提出了一种以结构的曲率模态为基础,综合考虑频率的变化的改进的结构损伤识别方法。随机子空间方法是一种行之有效的基于环境激励的结构状态识别方法。该方法的主要优点是无需人工激励,不中断桥梁的运营。为此,论文提出了一种不中断桥梁运营的基于改进曲率模态的桥梁结构损伤识别方法。最后用一三跨连续梁的有限元模型对该改进方法进行了验证。结果表明,采用随机子空间结合改进的曲率模态方法可以在不中断桥梁运营的前提下有效地识别出桥梁的损伤状况。
Structural damage identification is one of the major premises of structural health monitoring and structural condition assessment.Because the curvature mode is sensitive to structural damage location and the frequency is easy to test and precise,this paper presents a curvature mode based improved structural damage identification method.Stochastic subspace method is an effective structural condition identification method,which is based on the ambient excitation.The main advantage of the stochastic subspace identification method is that the artificial excitation is not needed,and it does not interrupt the operation of the bridge.Finally,the method is evaluated by numerical simulation in a three-span continuous beam.The results show that the improved method combined with stochastic subspace identification and improved curvature mode is an effective method to identify the bridge damage condition under the ambient excitation without interrupting the operation of the bridge.
Structural damage identification is one of the major premises of structural health monitoring and structural condition assessment.Because the curvature mode is sensitive to structural damage location and the frequency is easy to test and precise,this paper presents a curvature mode based improved structural damage identification method.Stochastic subspace method is an effective structural condition identification method,which is based on the ambient excitation.The main advantage of the stochastic subspace identification method is that the artificial excitation is not needed,and it does not interrupt the operation of the bridge.Finally,the method is evaluated by numerical simulation in a three-span continuous beam.The results show that the improved method combined with stochastic subspace identification and improved curvature mode is an effective method to identify the bridge damage condition under the ambient excitation without interrupting the operation of the bridge.
引文
[1]Doebling S W,Farrar C R,Prime MB,et al.Damage identification and health monitoring of structural and mechanical systems from changes intheir vibration characteristics:A literature review[R].Los Alamos:Los Alamos National Laboratory,1996.
[2]Abdel Wahab MM,De Roech G.Damage detection in bridges using modal curvatures:Application to a real damage scenario[J].Journal ofSound and Vibration,1999,226(2):217-235.
[3]Pandey MB,Samman M.Damage detection from changes in curvature mode shapes[J].Journal of Sound and Vibration,1991,145(2):321-332.
[4]常军,孙利民,张启伟.随机子空间识别方法计算效率的改进[J].地震工程与工程振动,2007,127(3):88-94.
[5]常军,孙利民,张启伟.基于两阶段稳定图的随机子空间识别结构模态参数[J].地震工程与工程振动,2008,28(3):47-51.
[6]刘洋,田石柱.基于随机子空间的结构参数识别及振动台试验验证[J].地震工程与工程振动,2004,24(2):111-117.
[7]Peeters B,De Roeck G.Reference-based stochastic subspace identification in civil engineering[J].Inverse Problems in Engineering,1999,100:1-28.
[8]Van Overschee P,De Moor B.Subspace identification for linear systems:Theory-implementation-applications[M].Kluwer Academic Publish-ers,Dordrecht,The Netherlands,1996.
[9]Peeters B,De Roeck G.Reference-based stochastic subspace identification for output-only modal analysis[J].Mechanical Systems and SignalProcessing,1999,13(6):855-878.
[10]常军.基于曲率模态的钢筋混凝土梁多点损伤位置识别[J].建筑科学与工程学报,2006,23(4):24-27.
[11]王成强,陈怀海,姜双燕,等.基于转角模态曲率的损伤识别研究[J].海军航空工程学院学报,2009,24(3):24-27.
[12]赵俊,程良彦,马宏伟.基于曲率模态的拱板结构损伤识别[J].暨南大学学报:自然科学版,2009,29(5):5470-476.
[2]Abdel Wahab MM,De Roech G.Damage detection in bridges using modal curvatures:Application to a real damage scenario[J].Journal ofSound and Vibration,1999,226(2):217-235.
[3]Pandey MB,Samman M.Damage detection from changes in curvature mode shapes[J].Journal of Sound and Vibration,1991,145(2):321-332.
[4]常军,孙利民,张启伟.随机子空间识别方法计算效率的改进[J].地震工程与工程振动,2007,127(3):88-94.
[5]常军,孙利民,张启伟.基于两阶段稳定图的随机子空间识别结构模态参数[J].地震工程与工程振动,2008,28(3):47-51.
[6]刘洋,田石柱.基于随机子空间的结构参数识别及振动台试验验证[J].地震工程与工程振动,2004,24(2):111-117.
[7]Peeters B,De Roeck G.Reference-based stochastic subspace identification in civil engineering[J].Inverse Problems in Engineering,1999,100:1-28.
[8]Van Overschee P,De Moor B.Subspace identification for linear systems:Theory-implementation-applications[M].Kluwer Academic Publish-ers,Dordrecht,The Netherlands,1996.
[9]Peeters B,De Roeck G.Reference-based stochastic subspace identification for output-only modal analysis[J].Mechanical Systems and SignalProcessing,1999,13(6):855-878.
[10]常军.基于曲率模态的钢筋混凝土梁多点损伤位置识别[J].建筑科学与工程学报,2006,23(4):24-27.
[11]王成强,陈怀海,姜双燕,等.基于转角模态曲率的损伤识别研究[J].海军航空工程学院学报,2009,24(3):24-27.
[12]赵俊,程良彦,马宏伟.基于曲率模态的拱板结构损伤识别[J].暨南大学学报:自然科学版,2009,29(5):5470-476.