OFR-35-84 Evaluation Of Roof Trusses, Phase II - Use Of Frequency Of Vibration To Determine Chord Tension
- Organization:
- The National Institute for Occupational Safety and Health (NIOSH)
- Pages:
- 57
- File Size:
- 2616 KB
- Publication Date:
- Jan 1, 1983
Abstract
This report deals with the 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 are investigated and evaluated. An approximate emperical 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.
Citation
APA: (1983) OFR-35-84 Evaluation Of Roof Trusses, Phase II - Use Of Frequency Of Vibration To Determine Chord Tension
MLA: OFR-35-84 Evaluation Of Roof Trusses, Phase II - Use Of Frequency Of Vibration To Determine Chord Tension. The National Institute for Occupational Safety and Health (NIOSH), 1983.