High-Mast Tower Foundation

1. Background High Mast Tower (HMT) foundations have been traditionally designed and constructed using a cast-in-place foundation with anchor bolts that are used to secure the tower to the ground. This type of design requires a large base plate that is welded to the tower shaft. The Nebraska DOT has experienced issues with stresses that this type of design presents at the anchor bolt/foundation interface and base plate/tower shaft interface. This issue in worst case may lead to a premature failure. There have been many research efforts in the past decade to evaluate the fatigue behavior of these High-Mast Lighting Towers (Connor et al. 2012, Thompson 2011), to propose retrofits that could reduce wind-induced vibrations in these structure (Ahearn and Puckett, 2010), to develop reliability-based design procedures for High-Mast Lighting structures (Goode and van de Lindt, 2007), and field instrumentation and testing of these structures to list a few (Connor and Hodgson, 2006). However, while most of these studies focused on the 100-120 ft tall structure, there are limited or no research conducted for the substructure related specifically to poles. Therefore, this study will propose studying possibilities evaluating alternative designs for the foundations, either directly buried, or through drilled shafts, that may drastically reduce the stresses that are present in High­ Mast Tower designs. 2. Objective The research objective is to develop an alternative design for the High-Mast Tower Foundations which can eliminate fatigue-prone details associated with the pole-to-base plate connection that is the primary failure location. To address critical issues, we will: 1. Evaluate the various types of foundations used in other structures that are similar in height and shape to the High-Mast Towers. This will include evaluating drilled shafts and direct embedment foundations for Power Transmission Line Structures. 2. Evaluate the corrosive environment with steel pole structure being embedded either in soil or concrete and propose mitigation measures for any corrosion issues found. 3. Based on these findings , provide design and construction provisions that will be integrated into NDOT specifications for design and construction .

    Language

    • English

    Project

    • Status: Active
    • Funding: $ $47,196.00
    • Sponsor Organizations:

      Nebraska Department of Transportation

      1500 Nebraska 2
      Lincoln, Nebraska  United States  68502
    • Project Managers:

      Halsey, Lieska

    • Performing Organizations:

      University of Nebraska, Lincoln

      1400 R Street
      Lincoln, NE  United States  68588
    • Principal Investigators:

      Sim, Chungwook

    • Start Date: 20190701
    • Expected Completion Date: 20201231
    • Actual Completion Date: 0
    • USDOT Program: Transportation, Planning, Research, and Development

    Subject/Index Terms

    Filing Info

    • Accession Number: 01705867
    • Record Type: Research project
    • Source Agency: Nebraska Department of Transportation
    • Files: RiP, STATEDOT
    • Created Date: May 24 2019 1:59PM