A parallel between earthquake sequences and acoustic emissions released during fracture process in reinforced concrete structures under flexural loading

Sagar, Vidya R (2016) A parallel between earthquake sequences and acoustic emissions released during fracture process in reinforced concrete structures under flexural loading. In: CONSTRUCTION AND BUILDING MATERIALS, 114 . pp. 772-793.

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Abstract

This article reports on the influence of (i) concrete compressive strength (ii) specimen geometry (iii) change in rate of loading (iv) percentage of steel reinforcement area of steel reinforcement as a percentage of the effective area of reinforced concrete (RC) structural member's cross section] (v) mode of failure on the relaxation ratio parameter (Colombo et al., 2005a, 2005b) of acoustic emissions (AE) released during fracture process in reinforced concrete (RC) flanged beam specimens. The aim is to study the feasibility of relaxation ratio analysis of AE signals for damage assessment in RC beams. The beam specimens were tested in the laboratory under incremental cyclic loading. The loading cycle first entered into the relaxation dominant phase in the relaxation ratio plot was equal or close to the loading cycle entering first into the heavy damage zone in the NDIS-2421 damage assessment plot proposed by Japanese society for nondestructive inspection. Further, the lowest AE based b-value was observed at the same or nearer loading cycle. Relaxation ratio analysis of AE signals is a useful method to assess the current load carrying capacity of a structure and state of damage in concrete structures in-situ. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	CONSTRUCTION AND BUILDING MATERIALS
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords:	Reinforced concrete; Acoustic emission; Damage; Cyclic loading; Structural health monitoring
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	30 Jun 2016 04:40
Last Modified:	30 Jun 2016 04:40
URI:	http://eprints.iisc.ac.in/id/eprint/54077

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