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Evaluation of Roof Trusses, Phase II. Use of Frequency of Vibration to Determine Chord Tension.

Authors
Mangelsdorf-CP
Source
NTIS: PB/84-166479 :58 pages
Link
NIOSHTIC No.
10003387
Abstract
This report deals with efforts to develop a portable device suitable for underground use for the purpose of measuring the frequency of vibration of the horizontal chords of birmingham roof trusses. Four devices were investigated and evaluated. An approximate empirical expression developed from a mathematical analysis provides a means of converting the frequency into tension. The method appears to be effective in mines with shale roof but requires some modification for other roofs.
Publication Date
19830101
Document Type
CP; Final Contract Report;
Fiscal Year
1983
NTIS Accession No.
PB84-166479
NTIS Price
A05
Identifying No.
OFR 35-84
NIOSH Division
SRC;
Source Name
NTIS: PB/84-166479
Performing Organization
University of Pittsburgh
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