Techno Press
Techno Press

Structural Engineering and Mechanics   Volume 54, Number 2, April7 2015, pages 291-304
DOI: http://dx.doi.org/10.12989/sem.2015.54.2.291
 
Detection and parametric identification of structural nonlinear restoring forces from partial measurements of structural responses
Ying Lei, Wei Hua, Sujuan Luo and Mingyu He

 
Abstract     [Full Text]
    Compared with the identification of linear structures, it is more challenging to conduct identification of nonlinear structure systems, especially when the locations of structural nonlinearities are not clear in structural systems. Moreover, it is highly desirable to develop methods of parametric identification using partial measurements of structural responses for practical application. To cope with these issues, an identification method is proposed in this paper for the detection and parametric identification of structural nonlinear restoring forces using only partial measurements of structural responses. First, an equivalent linear structural system is proposed for a nonlinear structure and the locations of structural nonlinearities are detected. Then, the parameters of structural nonlinear restoring forces at the locations of identified structural nonlinearities together with the linear part structural parameters are identified by the extended Kalman filter. The proposed method simplifies the identification of nonlinear structures. Numerical examples of the identification of two nonlinear multi-story shear frames and a planar nonlinear truss with different nonlinear models and locations are used to validate the proposed method.
 
Key Words
    nonlinear structural systems; parametric identification; nonlinear restoring force; extended Kalman filter; partial measurements
 
Address
Ying Lei, Wei Hua, Sujuan Luo and Mingyu He: Department of Civil Engineering, Xiamen University, Xiamen 361005, China
 

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