Measurement of existing prestressing force in concrete structures through an embedded vibrating beam strain gauge

Biswal, S and Ramaswamy, A (2016) Measurement of existing prestressing force in concrete structures through an embedded vibrating beam strain gauge. In: MEASUREMENT, 83 . pp. 10-19.

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Abstract

A steel frame is designed to measure the existing prestressing force in the concrete beams and slabs when embedded inside the concrete members. The steel frame is designed to work on the principles of a vibrating wire strain gauge and in the present study is referred to as a vibrating beam strain gauge (VBSG). The existing strain in the VBSG is evaluated using both frequency data on the stretched member and static strain corresponding to a fixed static load, measured using electrical strain gauges. The evaluated strain in the VBSG corresponds to the existing stain in the concrete surrounding the prestressing strands. The crack reopening load method is used to compute the existing prestressing force in the concrete members and is then compared with the existing prestressing force obtained from the VBSG at that section. Digital image correlation based surface deformation and change in neutral axis monitored by putting electrical strain gauges across the cross section, are used to compute the crack reopening load accurately. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	MEASUREMENT
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:	Existing prestressing force; Vibrating wire strain gauge; Crack reopening load; Digital image correlation; Prestressed concrete structures
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	01 Apr 2016 04:57
Last Modified:	01 Apr 2016 04:57
URI:	http://eprints.iisc.ac.in/id/eprint/53443

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