United States Department of Transportation
i
Fatigue Resistant Design Criteria for MD SHA Cantilevered Mast Arm Signal Structure : Research Summary
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2017-12-01
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By Fu, Chung C.
[PDF-214.60 KB]
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Abstract:Over the past two decades, wind induced fatigue cracking of highway signs, luminaires, and traffic signal support structures have been increasingly reported all over the United States. While fatalities associated with these failures have been limited, the nuisance of dealing with a large number of fatigue cracks in the sheer volume of these structures in the national inventory, along with the cost of inspecting, repairing and/or replacing the cracked structures, has been substantial. As such, a reliable assessment of the fatigue performance of these structures and their improved cost‐effective design of fatigue critical details are of great importance. The fatigue design of the mast arm structures and connections vary significantly based on the Category of Importance factor adopted and the load cases for fatigue design loads. Consideration should include the cost and size of the structures for both urban and rural applications, and the type of vibration mitigation devices to be adopted for use on cantilevered mast arm structures.
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