Abstract
Artificial Neural Networks (ANN) have been proven applicable for updating finite-element (FE) baseline model and structural damage assessment. Most ANN-based damage identification methods use natural frequencies and mode shapes as input layer, limiting their application to quantifying single symmetrical damage in small structures. However, getting higher modal information of a structure is a crucial challenge in practice. As of late, researchers began utilizing mode shape derivatives as input layer in ANN to defeat the challenges for damage assessment in real-life structures. This study, therefore, proposes an ANN-based damage assessment method that employs the change in the first mode shape slope (CFMSS) damage index (DI) as input layer in ANN. For single-damage scenarios, the CFMSS-based DI has been able to detect, locate, and quantify the damage. For multiple-damage scenarios, the DI and corresponding stiffness reduction (SR) are fit as input and output layers, respectively, in ANN to measure the damage severity. Structural damage intensity is indicated as rate of decrease in story stiffness compared to baseline model. The efficiency of the proposed damage identification method is demonstrated through a nine-story numerical shear frame model and an experimental test on a three-story steel shear frame model.
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Acknowledgements
The authors would like to thank the Department of Civil Engineering NIT Durgapur, India for providing necessary support and cooperation for this Investigation. Support from R & D Scheme of Technical Education Quality Improvement Programme (TEQIP) of Government of India is gratefully acknowledged.
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Paral, A., Singha Roy, D.K. & Samanta, A.K. Application of a mode shape derivative-based damage index in artificial neural network for structural damage identification in shear frame building. J Civil Struct Health Monit 9, 411–423 (2019). https://doi.org/10.1007/s13349-019-00342-x
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DOI: https://doi.org/10.1007/s13349-019-00342-x