AERODYNAMICALLY INDUCED STRESSES IN TRAFFIC SIGNALS AND LUMINAIRE SUPPORTS

THIS STUDY CONSIDERS THE AERODYNAMIC AND STRUCTRAL DYNAMIC BEHAVIOR OF TRAFFIC SIGNAL AND LUMINAIRE RESPONSES TO WIND INDUCED VIBRATIONS. LOADINGS CONSIDERED CONSIST OF: DEAD LOADS, STATIC WIND LOADS, UNSTEADY RANDOM WIND GUSTS, AND VON-KARMAN STEADY STATE WIND EXCITATIONS. DYNAMIC ANALYSES HAVE BEEN PERFORMED EMPLOYING FINITE ELEMENT METHODS AND MODAL ANALYSIS TECHNIQUES. STRUCTURAL MODELING PRINCIPLES ALLOW A FULL SIX DEGREES OF FREEDOM AT EACH NODE POINT OF THE STRUCTURE. RESULTANT DYNAMIC MODE SHAPES USED IN THE SOLUTIONS POSSESS A GENERAL THREE DIMENSIONAL SET OF DEFORMATIONS (THREE DISPLACEMENTS AND THREE ROTATIONS AT EACH NODE POINT). A TOTAL OF TWELVE MODES ARE EMPLOYED IN ALL THE DYNAMIC ANALYSIS CALCULATIONS. TOTAL STRUCTURAL RESPONSE STRESSES ARE SUMMED AND COMPARED VS. A LINEAR CYCLIC FATIGUE DAMAGE ACCUMULATION CRITERION. FOR THE THREE STEEL STRUCTURES CONSIDERED, WIND INDUCED VIBRATIONS PRODUCE NEGLIGIBLE REDUCTION IN SERVICE LIFE. AS A PART OF THIS STUDY, A GENERAL COMPUTER PROGRAM HAS BEEN DEVELOPED TO PREDICT DYNAMIC STRESS RESPONSES OF SIGNALS AND LUMINAIRES TO WIND EFFETS. /AUTHOR/

  • Supplemental Notes:
    • Contract No D-4-91
  • Corporate Authors:

    Mechanics Research, Incorporated

    9841 Airport Boulevard
    Los Angeles, CA  USA  90045

    California Division of Highways

    Bridge Department
    Sacramento, CA  USA  05914

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Lundquist, R C
    • Johnson, K D
    • Bampton, M C
  • Publication Date: 1971-12

Media Info

  • Pagination: 119 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00208067
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: No. D-4-91
  • Files: TRIS, USDOT
  • Created Date: Apr 30 1973 12:00AM