EVALUATION OF TIMBER WEAK POST GUARDRAIL SYSTEMS

SIX FULL-SCALE VEHICLE CRASH TESTS WERE CONDUCTED OF GUARDRAIL SYSTEMS TO EVALUATE THE EFFECTIVENESS OF SUBSTITUTING TIMBER POSTS FOR THE STANDARD 315.7 STEEL POSTS SPECIFIED IN A CURRENT GUARDRAIL STANDARD. RESULTS OF THE TESTS INDICATE THAT TIMBER IS A SUITABLE POST MATERIAL FOR THE "WEAK POST" CONCEPT. ALTHOUGH THERE WAS SOME DIFFICULTY IN DETERMINING THE PROPER RAIL ATTACHMENT TO THE POST, ALTERNATE SOLUTIONS TO THIS PROBLEM ARE SUGGESTED IN THE REPORT. BASICALLY, THE TIMBER POST DESIGN CALLS FOR A 12 GA FLEX BEAM MOUNTED ON 6 X 5-IN. OR 5-1/2-IN. DIA PINE POSTS SPACED AT 12.5-FT CENTERS. A 1/4-IN. DIA STEEL BOLT AND A PIPE INSERT PROVIDE PROPER ATTACHMENT OF RAIL TO POST. THE SIXTH TEST OF THE SERIES PROVIDED AN EVALUATION OF THE EFFECTIVENESS OF A CONTINOUS INSTALLATION COMPOSED OF THE NEW TIMBER WEAK POST SYSTEM AND THE ODH STRONG POST SYSTEM. THE TEST RESULTS INDICATED THAT THE TRANSITION DESIGN BETWEEN THE TWO SYSTEMS WAS SATISFACTORY, BUT DESIGN COULD IMPROVE PERFORMANCE. /AUTHOR/

  • Supplemental Notes:
    • Final Rept, 130 PP, 60 FIG, 19 TAB, 3 APP
  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  USA  78228-0510
  • Authors:
    • Bronstad, M E
  • Publication Date: 1970-4

Subject/Index Terms

Filing Info

  • Accession Number: 00203467
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 17 1970 12:00AM