Fatigue load testing of full-scale dynamic message signs

Junwon Seo, Ibin Amatya

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


This paper summarizes results acquired from the fatigue testings of two full-scale dynamic message signs (DMSs) fabricated by a local manufacturer in the United States. One DMS with adhesive joints and one DMS with welded joints were tested with fatigue loading. For the testing, each of the DMSs was loaded up to 500,000 cycles with a force ranging between 0.249 kN and 0.818 kN equivalent to the design natural wind gust pressure based on a yearly mean speed of 18.02 km/h according to the AASHTO LRFD Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals. Strain, displacement, and load were recorded during each test to analyze the structural adequacy of tested DMSs. During the testing, all the stress ranges observed in each of the tested DMSs were considerably below the threshold of the DMS panel, which was determined by generating its S-N curves. The maximum deflection range was found to be highest near the center for both adhesive and welded DMSs when encountered with the fatigue loads. It is recommended that additional stiffeners be installed to reduce the deflection range of the DMS at the center. It was also found that any damage was not observed in both the adhesive and welded DMSs due to the fatigue loading.

Original languageEnglish
Article number111357
JournalEngineering Structures
StatePublished - Jan 1 2021

Bibliographical note

Funding Information:
The contents of this paper reflect the views of the authors, who are responsible for all the information and accuracy of the data presented herein. This work was sponsored by Daktronics and Mountain-Plains Consortium. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of Mountain-Plains Consortium. The authors thank Dan Bierschbach, John Syrstad, and Toby Pulscher at Daktronics for their financial support, invaluable comments, and support for this work.

Publisher Copyright:
© 2020


  • Adhesive
  • Dynamic message signs, Strength
  • Fatigue load
  • Weld

ASJC Scopus subject areas

  • Civil and Structural Engineering


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