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Title:

DYNAMIC TESTING OF MALLEABLE ALUMINUM TRANSFORMER BASES FOR HIGHWAY LUMINAIRES

Accession Number:

00196618

Record Type:

Component

Availability:

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

Abstract:

The purpose of the reported test program was to develop modifications to existing malleable aluminum transformer bases for highway luminaires that could be performed in the field with minimal equipment and labor expenditure. The evaluation consisted of two phases; first, determining whether the modifications resulted in acceptable breakaway performance as indicated by the momentum change of the impacting vehicle, and, second, determining whether the modifications could result in a serious degradation of expected service life as indicated by results of a limited accelerated fatigue study. The dynamic tests were conducted in accordance with NCHRP Report 153 and used a 1020-kg (2250-lb) car impacting at 9 and 18 m.s (20 and 40 mph). Fatigue tests consisted of vibrating a horizontally mounted base and pole shaft at the resonant frequency of the pole until failure occurred. The tests indicated that a base saw cut, made horizontally to leave 76.2 mm by 4.76 mm (3 x 3/16-in) thick metal on each side, would induce approximately 362 kg-s (800 lb's) momentum transfer and 6 g 50 millisecond maximum average deceleration in the test vehicle. Terminating the saw cut in 38-mm (1 1/2-in) diameter holes proved sufficient to induce fatigue failure in the unmodified pole instead of the base. /Author/

Supplemental Notes:

Publication of this paper sponsored by Committee on Safety Appurtenances. 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 Accession #:

01411518

Report/Paper Numbers:

HS-026 748

Authors:

Haviland, John E
SEGAL, DAVID J

Pagination:

pp 29-33

Publication Date:

1978

Serial:

Transportation Research Record

Issue Number: 679
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

57th Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia, United States
Date: 1978-1-16 to 1978-1-20

ISBN:

0309028248

Media Type:

Digital/other

Features:

Figures (1) ; Photos; Tables (3)

Subject Areas:

Design; Highways; Safety and Human Factors

Files:

TRIS, TRB

Created Date:

Aug 28 1979 12:00AM

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