Roof truss contact forces

Details

• Personal Author:
  Serbousek, Maynard O. ; Stears, Juel H.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  "Increasing use of birmingham and other roof trusses prompted a Bureau of Mines study of support forces produced on a mine roof by these members. Equations, obtained from laboratory and field tests, are given for calculating the contact forces between the roof strata and a typical truss. Actual contact forces for a specific truss are difficult to estimate because of variable friction loss at the contact points. A finite-element analysis, using typical contact forces, indicated that trusses have a negligible effect on the stress field in massive, competent roof strata. The effectiveness of trusses in supporting broken rock strata was not analyzed. However, experience has shown that trusses are effective in supporting incompetent roof." - NIOSHTIC-2
  
  NIOSH no. 10005994
  
  
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  ii, 20 numbered pages
• NIOSHTIC Number:
  nn:10005994
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:68040c2ce41fb8b2e72d4714650b9e09c37617f22e503aeff24c5d28ca6c00b34a8dbe1e2e46a022d6a5db4a8b176d37518004dc17aca9137e1f5bfd0a829946
• Download URL:
  https://stacks.cdc.gov/view/cdc/10688/cdc_10688_DS1.pdf
• File Type:
  [PDF - 8.38 MB ]