Fatigue load testing of full-scale dynamic message signs

Junwon Seo; Ibin Amatya

doi:10.1016/j.engstruct.2020.111357

Fatigue load testing of full-scale dynamic message signs

Junwon Seo, Ibin Amatya

Civil Engineering

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

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 language	English
Article number	111357
Journal	Engineering Structures
Volume	226
DOIs	https://doi.org/10.1016/j.engstruct.2020.111357
State	Published - 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

Keywords

Adhesive
Dynamic message signs, Strength
Fatigue load
Weld

ASJC Scopus subject areas

Civil and Structural Engineering

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10.1016/j.engstruct.2020.111357

Cite this

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title = "Fatigue load testing of full-scale dynamic message signs",

abstract = "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.",

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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: {\textcopyright} 2020",

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Fatigue load testing of full-scale dynamic message signs

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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