Wind load effects on signs, luminaires and traffic signal structures

The objectives of this study were: (1) to revise the wind load section of the TxDOT standard for highway signs, luminaires and traffic signal structures, and (2) to develop strategies to mitigate large vibrations in single-mast traffic signal structures subject to cross-wind vibrations. The first objective was accomplished by developing a new design wind speed map for the State of Texas. State-of-knowledge wind engineering technology is incorporated in the revised design standard. A better understanding of the cross-wind vibration problem, which takes place in steady winds in the range of 5 to 15 m/s, was obtained by conducting water table, tow tank and field studies. The vibrations are attributed to a galloping phenomenon, which primarily takes place when the wind is blowing normal to the mast arm from the back side of a traffic signal with backing plate. The most effective mitigation measure was found to be a horizontal wing attached above the signal light. TxDOT maintenance personnel should install a wing when mast arm tip vibrations exceed 40 cm.

• Corporate Authors:

  Texas Tech University. Wind Engineering Research Center

  Lubbock, Texas  United States 
• Authors:
  • Macdonald, J R
  • Mehta, K C
  • Oler, W W
  • Pulipaker, N
• Publication Date: 1995-2

Language

• English

Media Info

• Pagination: 182p
• Serial:
  • Issue Number: 1303-F

Subject/Index Terms

• TRT Terms: Aerodynamics; Design standards; Lanterns; Strength of materials; Traffic signals; Traffic signs; Vibration; Wind
• ATRI Terms: Aerodynamics; Design standard; Lantern; Strength; Traffic sign; Traffic signal; Vibration; Wind
• Subject Areas: Design;

Filing Info

• Accession Number: 01400299
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, ATRI
• Created Date: Aug 23 2012 7:31PM