Damage Detection for Continuous Bridge Based on Static-Dynamic Condensation and Extended Kalman Filtering

As an effective and classical method about physical parameter identification, extended Kalman filtering (EKF) algorithm is widely used in structural damage identification, but the equations and solutions for the structure with bending deformation are not established based on EKF. The degrees of free...

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Bibliographic Details
Published in:Mathematical problems in engineering 2014-01, Vol.2014 (1)
Main Authors: He, Haoxiang, Lv, Yongwei, Han, Enzhen
Format: Article
Language:English
Subjects:
Accuracy
Actuators
Algorithms
Bridge inspection
Civil engineering
Condensation
Condensing
Continuous bridges
Damage detection
Damping
Deformation effects
Dynamics
Earthquakes
Excitation
Finite element method
Free vibration
Girder bridges
Impact analysis
Kalman filters
Mathematical analysis
Mathematical models
Noise
Parameter identification
Physical properties
Regularization methods
Signal processing
Structural health monitoring
Vibration analysis
Vibration monitoring
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Summary:As an effective and classical method about physical parameter identification, extended Kalman filtering (EKF) algorithm is widely used in structural damage identification, but the equations and solutions for the structure with bending deformation are not established based on EKF. The degrees of freedom about rotation can be eliminated by the static condensation method, and the dynamic condensation method considering Rayleigh damping is proposed in order to establish the equivalent and simplified modal based on complex finite element model such as continuous girder bridge. According to the requirement of bridge inspection and health monitoring, the online and convenient damage detection method based on EKF is presented. The impact excitation can be generated only on one location by one hammer actuator, and the signal in free vibration is analyzed. The deficiency that the complex excitation information is needed based on the traditional method is overcome. As a numerical example, a three-span continuous girder bridge is simulated, and the corresponding stiffness, the damage location and degree, and the damping parameter are identified accurately. It is verified that the method is suitable for the dynamic signal with high noise-signal ratio; the convergence speed is fast and this method is feasible for application.
ISSN:1024-123X
1563-5147
DOI:10.1155/2014/707969