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Comparative study on damage identification from lso-Eigen-Value-Change contours and smeared damage model

Lakshmanan, N and Raghuprasad, BK and Gopalakrishnan, N and Sreekala, R and Rao, GV Rama (2010) Comparative study on damage identification from lso-Eigen-Value-Change contours and smeared damage model. In: Structural Engineering & Mechanics, 35 (6). pp. 735-758.

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Abstract

The paper proposes two methodologies for damage identification from measured natural frequencies of a contiguously damaged reinforced concrete beam, idealised with distributed damage model. The first method identifies damage from 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. The method is also extended to a discrete structure in the form of a five-storied shear building and the simplicity of the method is demonstrated. The second method is through smeared damage model, where the damage is assumed constant for different segments of the beam and the lengths and centres of these segments are the known inputs. First-order perturbation method is used to derive the relevant expressions. Both these methods are based on distributed damage models and have been checked with experimental program on simply supported reinforced concrete beams, subjected to different stages of symmetric and un-symmetric damages. The results of the experiments are encouraging and show that both the methods can be adopted together in a damage identification scenario.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to TechnoPress.
Keywords: Damage identification;Iso-eigen-change;smeared damage model.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 24 Aug 2010 05:45
Last Modified: 24 Aug 2010 05:45
URI: http://eprints.iisc.ernet.in/id/eprint/31316

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