Detection of contiguous and distributed damage through contours of equal frequency change

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• 作者：N. Lakshmanan ; B.K. Raghuprasad ; N. Gopalakrishnan ; K. Sathishkumar ; S.G.N. Murthy
• 刊名：Journal of Sound and Vibration
• 出版年：2010
• 出版时间：26 April 2010
• 年：2010
• 卷：329
• 期：9
• 页码：1310-1331
• 全文大小：2821 K

文摘

The paper presents the results of a computational modeling for damage identification process for an axial rod representing an end-bearing pile foundation with known damage and a simply supported beam representing a bridge girder. The paper proposes a methodology for damage identification from measured natural frequencies of a contiguously damaged reinforced concrete axial rod and beam, idealized with distributed damage model. Identification of damage is from Equal_Eigen_value_change (Iso_Eigen_value_Change) contours, plotted between pairs of different frequencies. The performance of the method is checked for a wide variation of damage positions and extents. An experiment conducted on a free–free axially loaded reinforced concrete member and a flexural beam is shown as examples to prove the pros and cons of this method.