In-service monitoring of a cantilever sign gantry

VicRoads discovered fatigue related anchor rod defects cantilever sign gantries in Victoria. Gantry failures were discovered in the USA in the mid 1990's and extensive research was carried out by the NCH in the USA and this has culminated in a design specification produced by AASHTO. VicRoads have advised that this standard (or equivalent) be used for all future cantilever gantry designs. There is an unresolved issue concerning the susceptibility of cantilever sign gantries (of box section construction) to vortex shedding actions. The AASHTO specification indicates that vortex shedding is "almost never" a significant action observed in failures in cantilever sign gantries in the USA, and appears to ignore it in general design considerations. As Leighton's design consultant, GHD recommended that the opportunity to monitor the re-installed original gantry at Broderick Road for a limited period be taken to get a better understanding of the behavior of the gantry in the field, and compare it with the AASHTO design actions. This paper presents the data captured, and GHD's analysis, conclusions and recommendations.


  • English

Media Info

  • Pagination: 9p
  • Monograph Title: Innovation in engineered wood product bridge components

Subject/Index Terms

Filing Info

  • Accession Number: 01384420
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 22 2012 4:34PM