Abstract
In this paper, the technique recently proposed by the authors for the detection of structural local damage in large size linear structures is extended to explore the detection of local damage in some complex nonlinear structures. The technique is based on substructural approach in which a complex nonlinear structure is decomposed into substructures Interaction effect between adjacent substructures is accounted by considering the interaction forces at substructural interfaces as the 'unknown inputs' to the substructures. An algorithm utilizing the classical Kalman extended estimator and the recursive least squares estimation for the unknown inputs is proposed to identify structural parameters at element level and the 'unknown inputs' to the substructure. Two cases that measurements at the substructure interfaces are available or not available are considered. Structural local damage is estimated from the change of structural parameters, such as the degradation of the stiffness, at element level. The technique enables distributed identification of local damage in complex nonlinear structures utilizing only a limited number of measured acceleration responses. Performance of proposed technique is illustrated by a numerical example of detecting local damage in a multi-story hysteretic building. It is shown that the proposed technique can be used for detecting structural local damage in some complex nonlinear structures.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.