PENDUUM TESTS OF BREAKAWAY WOOD SIGN SUPPORTS USING CRUSHABLE BUMPERS

Ten pendulum impact tests of breakaway wood sign supports were conducted to evaluate safety performance. Two sizes of timber supports were tested per AASHTO impact conditions, i.e., 1020 kg (2250 lb) mass and 32 km/h (20 mph). Two crushable pendulum nose designs were also used to evaluate relative performance. The findings indicate that both support sizes can be modified by drilled holes to effect structures that safely break away with a pendulum mass momentum change of less than 3.36 kM's (750 lb's). The findings also indicate that the crushable nose design has an imporant effect on the breakaway performance. Sequential photographs illustrate that the fracture mechanism is similar for the ten tests. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 33-38
  • Monograph Title: Roadside safety appurtenances
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196619
  • Record Type: Publication
  • ISBN: 0309028248
  • Report/Paper Numbers: HS-026 748
  • Files: TRIS, TRB
  • Created Date: Aug 28 1979 12:00AM