DEVELOPMENT OF ALUMINUM BARRIER SYSTEMS

THE ALUMINUM INDUSTRY HAS DEVELOPED ALUMINUM BARRIER SYSTEMS THAT WILL SATISFY THE CRITERIA DEVELOPED BY THE BUREAU OF PUBLIC ROADS. THE FIRST SERIES OF TESTS WERE PERFORMED ON ALUMINUM UNIVERSAL "W" BEAM SYSTEMS AT APPROXIMATELY 60 MPH AND A 15 DEGREE ANGLE. BRIDGE RAIL SYSTEMS USING EXTRUDED RAILS AND EXTRUDED OR CAST POSTS WERE DESIGNED AND TESTED. BRIDGE RAIL SYSTEMS DESIGNED TO MEET CURRENT SPECIFICATIONS AND SOME TO MEET 1962 PROPOSED CRITERIA, AND EVENTUALLY TO MEET 1964 AASHO SPECIFICATIONS, WERE IMPACTED. THE SYSTEM USING THE LATTER GAVE THE BEST RESULTS AND THESE HAVE BEEN ADOPTED AS STANDARDS. MEDIAN BARRIER DESIGNS OF ALUMINUM WERE THEN TESTED. THESE INCLUDE BOTH A STRONG BEAM SYSTEM THAT HAS POSTS THAT ARE NOT STRONG ENOUGH LONGITUDINALLY TO SNAG A CAR AND A BALANCED SYSTEM WITH STRONG RAILS AND STRONG POSTS. IN THIS CASE, THE RAILS ARE STRONG ENOUGH AND OFFSET FROM THE RAIL ENOUGH TO PREVENT THE CAR FROM PENETRATING THE BARRIER TO SNAG ON THE STRONG POSTS. THE BALANCED SYSTEM ALLOWS VERY LITTLE DEFLECTION FOR USE ON NARROW MEDIANS. A SHOULDER MOUNTED RAIL USING THE SAME COMPONENTS WAS TESTED. ITS MAIN PURPOSE IS FOR BRIDGE TRANSITIONS, USUALLY USING THE SAME RAIL EXTRUSION AS THE BRIDGE BARRIER. THE SOFT BEAM BARRIER ALLOWS MORE DEFLECTION AND A SOFTER, SAFER IMPACT. ALL OF THE SYSTEMS RECOMMENDED AS A RESULT OF THESE TESTS WILL ADEQUATELY PERFORM THE FUNCTION OF BEING EFFECTIVE AND SAFE BARRIERS.

  • Supplemental Notes:
    • 33 Pp, 23 FIG, 3 TAB, PHOT
  • Corporate Authors:

    Aluminum Association

    Highway Applications Committee
    ,   United States 
  • Authors:
    • Mcmullin, W B
    • HOWE, J D
    • Lengel, J S
    • Stemler, R S
    • Vaterlaus, R H
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00203439
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 13 1970 12:00AM