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Title:

PORTABLE RECORDER FOR BRIDGE STRESSES

Accession Number:

00179378

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

Development and operation of a portable instrument for recording strain events in bridges under field-service conditions are described. The instrument consists of a transducer, which is lamped to the flange of a bridge by four allen screws; a set of mechanical counters driven by electronic logic circuity; a battery pack; and a tamper-proof enclosure. As much as 80 d of continuous operation can be realized before batteries must be serviced. Each counter is incremented every time the strain reaches the triggering level selected for that counter. Triggering levels are selected to be distributed over a range slightly greater than the strain range expected in the bridge. For the usual case, in which the triggering levels are all in the elastic range, a simple hand calculation will produce a stress histogram from the counter readings. The theory and a procedure for predicting bridge life from the collected data are also presented. Results of a short field test indicate that the instrument provides a practical and economical means by which relatively unskilled personnel can collect stress-history data. /Author/

Supplemental Notes:

Publication of this paper sponsored by Committee on Dynamics and Field Testing of Bridges. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

Monograph Title:

Bridge Tests

Monograph Accession #:

01411488

Authors:

Williams, Mark W
Baldwin Jr, James W

Pagination:

pp 25-29

Publication Date:

1977

Serial:

Transportation Research Record

Issue Number: 645
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309026741

Media Type:

Digital/other

Features:

Figures (10) ; References (16)

Uncontrolled Terms:

Field measurements

Old TRIS Terms:

Subject Areas:

Bridges and other structures; Energy; Highways

Files:

TRIS, TRB

Created Date:

Aug 27 1978 12:00AM

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