Damage limit states of reinforced concrete beams subjected to incremental cyclic loading using relaxation ratio analysis of AE parameters

Sagar, Vidya R and Prasad, Raghu BK (2012) Damage limit states of reinforced concrete beams subjected to incremental cyclic loading using relaxation ratio analysis of AE parameters. In: Construction and Building Materials, 35 . pp. 139-148.

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Abstract

This paper presents an experimental study on damage assessment of reinforced concrete (RC) beams subjected to incremental cyclic loading. During testing acoustic emissions (AEs) were recorded. The analysis of the AE released was carried out by using parameters relaxation ratio, load ratio and calm ratio. Digital image correlation (DIC) technique and tracking with available MATLAB program were used to measure the displacement and surface strains in concrete. Earlier researchers classified the damage in RC beams using Kaiser effect, crack mouth opening displacement and proposed a standard. In general (or in practical situations), multiple cracks occur in reinforced concrete beams. In the present study damage assessment in RC beams was studied according to different limit states specified by the code of practice IS-456:2000 and AE technique. Based on the two ratios namely load ratio and calm ratio and when the deflection reached approximately 85% of the maximum allowable deflection it was observed that the RC beams were heavily damaged. The combination of AE and DIC techniques has the potential to provide the state of damage in RC structures.

Item Type:	Journal Article
Publication:	Construction and Building Materials
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Reinforced Concrete Beams; Acoustic Emission Testing; Damage Assessment; Incremental Cyclic Loading; Digital Image Correlation Technique
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	22 Feb 2013 09:37
Last Modified:	22 Feb 2013 09:37
URI:	http://eprints.iisc.ac.in/id/eprint/45389

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