Re-tightening the Large Anchor Bolts of Support Structures for Signs and Luminaires

This project will investigate causes of loose anchor bolts in support structures in Minnesota (e.g., overhead signs, high mast light tower, tall traffic signals) and propose solutions based on site surveying, field monitoring, laboratory study and numerical analysis. In particular, the University will study how these anchor bolts were initially tightened and whether they were adequately pretensioned. The objective of this project is to develop the best practical procedures using available equipment to retighten the loose anchor bolts so as to develop required pretention. This project will ensure that the anchor bolts will perform as designed, while minimizing required inspection frequency.


  • English


  • Status: Completed
  • Funding: $115,730
  • Contract Numbers:

    99004 WO#25

  • Sponsor Organizations:

    Minnesota Department of Transportation

    395 John Ireland Boulevard
    St Paul, MN  United States  55155
  • Project Managers:

    Holdhusen, Bruce

  • Performing Organizations:

    Iowa State University, Ames

    Department of Civil, Construction and Environmental Engineering
    Town Engineering Building
    Ames, IA  United States  50011-3232
  • Principal Investigators:

    Chen, An

  • Start Date: 20160607
  • Expected Completion Date: 20180831
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01607761
  • Record Type: Research project
  • Source Agency: Minnesota Department of Transportation
  • Contract Numbers: 99004 WO#25
  • Files: RiP, STATEDOT
  • Created Date: Aug 19 2016 11:15AM