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Structural Engineering and Mechanics
  Volume 25, Number 2, January30 2007 , pages 131-146

Modeling and damage detection for cracked I-shaped steel beams
Jun Zhao and John T. DeWolf

    This paper presents the results of a study to show how the development of a crack alters the structural behavior of I-shaped steel beams and how this can be used to evaluate nondestructive evaluation techniques. The approach is based on changes in the dynamic behavior. An approximate finite element model for a cracked beam with I-shaped cross-section is developed based on a simplified fracture model. The model is then used to review different damage cases. Damage detection techniques are studied to determine their ability to identify the existence of the crack and to identify its location. The techniques studied are the coordinate modal assurance criterion, the modal flexibility, and the state and the slope arrays.
Key Words
    coordinate modal assurance criterion; cracking; damage detection; finite element modeling; modal flexibility; mode shapes; natural frequencies; nondestructive evaluation; state and slope arrays; steel beams
Jun Zhao; A. Epstein and Sons, Inc., Chicago, IL, USA
John T. DeWolf; Department of Civil & Environmental Engineering, University of Connecticut, Storrs, CT, USA

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