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Abstract

In the present paper the problem of identification of the depth and the position of a crack in frame structures is examined, using eigenfrequency measurements. It has been established that a crack in a structure has an important effect on its dynamic behaviour. This effect depends mainly on the crack size and position. The basic idea is to find, using the finite element method, the dependency of the structural eigenfrequencies on crack depth and location. Then the functions, that describe this dependency, are plotted for measured eigenfrequency variations when a crack is present. By superposition of the contour plots of the first two eigenfrequencies the determined intersecting point corresponds to the crack's depth and location. If more than one intersecting points exist, then the contour plot of the third eigenfrequency is superposed on the first two, and only one intersecting point is established and so on. A number of verification examples, for this combination of computational, graphical and experimental method, are included in this paper, for beams and frames.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 28 COMPUTATIONAL STRUCTURAL ENGINEERING FOR PRACTICE Edited by: M. Papadrakakis and B.H.V. Topping Paper I.1 Crack Identification in Structures P.G. Nikolakopoulos, D.E. Katsareas and C.A. Papadopoulos Machine Design Laboratory, Mechanical Design Department, University of Patras, Greece doi:10.4203/ccp.28.1.1 purchase the full-text of this paper Full Bibliographic Reference for this paper P.G. Nikolakopoulos, D.E. Katsareas, C.A. Papadopoulos, "Crack Identification in Structures", in M. Papadrakakis, B.H.V. Topping, (Editors), "Computational Structural Engineering for Practice", Civil-Comp Press, Edinburgh, UK, pp 1-7, 1994. doi:10.4203/ccp.28.1.1 Abstract In the present paper the problem of identification of the depth and the position of a crack in frame structures is examined, using eigenfrequency measurements. It has been established that a crack in a structure has an important effect on its dynamic behaviour. This effect depends mainly on the crack size and position. The basic idea is to find, using the finite element method, the dependency of the structural eigenfrequencies on crack depth and location. Then the functions, that describe this dependency, are plotted for measured eigenfrequency variations when a crack is present. By superposition of the contour plots of the first two eigenfrequencies the determined intersecting point corresponds to the crack's depth and location. If more than one intersecting points exist, then the contour plot of the third eigenfrequency is superposed on the first two, and only one intersecting point is established and so on. A number of verification examples, for this combination of computational, graphical and experimental method, are included in this paper, for beams and frames. purchase the full-text of this paper (price £20) go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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