SAFETY PROVISIONS FOR SUPPORT STRUCTURES ON OVERHEAD SIGN BRIDGES

THE CONCEPT EMPLOYS A FRANGIBLE SLIP BASE COLUMN SUPPORT WITH A ROTATING, PIN-JOINTED UPPER SUPPORT WHICH ALSO INCLUDES A FRANGIBLE-BOLT TOP ANCHOR. A 140 FOOT SIGN BRIDGE REPRESENTING A MAXIMUM LIKELY SIZE EMPLOYING 26 1/2 FOOT TAPERED H SECTION T-1 STEEL COLUMNS WITH THE ABOVE-MENTIONED BREAKAWAY FEATURES IS DESIGNED, ANALYZED, BUILT, AND TESTED TO DEMONSTRATE ITS FEASIBILITY. THE TEST PROGRAM RESULTS UTILIZING FULL SCALE VEHICLE CRASH TESTS DEMONSTRATE THAT THE PROTOTYPE STRUCTURE WITH INDEPENDENT BREAKAWAY COLUMNS HAS SATISFACTORY IMPACT BEHAVIOR AT SPEEDS OF 21 MPH UP TO 72 MPH AND AT ANGLES UP TO 15 DEGREES. /FHWA/

• Supplemental Notes:
  • Study No HpR-2(107), 6 VOLS
• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Breakaway supports; Crash tests; Crashes; Overhead traffic signs; Safety; Structures; Testing
• Subject Areas: Bridges and other structures; Design; Highways; Research; Safety and Human Factors;

Filing Info

• Accession Number: 00219760
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Files: TRIS, USDOT
• Created Date: Feb 15 1972 12:00AM