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Structural Engineering and Mechanics
  Volume 64, Number 6, December25 2017 , pages 803-817
DOI: https://doi.org/10.12989/sem.2017.64.6.803
 


Damage detection for a beam under transient excitation via three different algorithms
Ying Zhao, Mohammad Noori and Wael A. Altabey

 
Abstract
    Structural health monitoring has increasingly been a focus within the civil engineering research community over the last few decades. With increasing application of sensor networks in large structures and infrastructure systems, effective use and development of robust algorithms to analyze large volumes of data and to extract the desired features has become a challenging problem. In this paper, we grasp some precautions and key points of the signal processing approach, wavelet, establish a relative reliable framework, and analyze three problems that require attention when applying wavelet based damage detection approach. The cases studies how to use optimal scales for extracting mode shapes and modal curvatures in a reinforced concrete beam and how to effectively identify damages using maximum curves of wavelet coefficient differences. Moreover, how to make a recognition based on the wavelet multi-resolution analysis, wavelet packet energy, and fuzzy sets is a meaningful topic that has been addressed in this work. The relative systematic work that compasses algorithms, structures and evaluation paves a way to a framework regarding effective structural health monitoring, orientation, decision and action.
 
Key Words
    mode shape; curvature mode; wavelet coefficient differences; multi-resolution analysis; damage identification; artificial neural network; fuzzy pattern recognition; reinforced concrete beam
 
Address
Ying Zhao : International Institute for Urban Systems Engineering, Southeast University, Nanjing, 210096, China

Mohammad Noori : International Institute for Urban Systems Engineering, Southeast University, Nanjing, 210096, China; Mechanical Engineering, California Polytechnic State University, San Luis Obispo, California 93405, USA

Wael A. Altabey :International Institute for Urban Systems Engineering, Southeast University, Nanjing, 210096, China; Department of Mechanical Engineering, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
 

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