United States Department of Transportation
i
Investigation of High Mast Illumination Pole Handhole Cracking [Technical Summary]
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2024-03-01
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[PDF-344.63 KB]
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Edition:Technical Summary
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Abstract:This report describes an investigation in which four poles removed from service were studied to determine potential origins and driving factors of the handhole cracking. Each pole was cut and processed so that the crack surfaces could be examined. Sub-sized Charpy V-Notch (CVN) specimens were sampled from each pole and tested to estimate the toughness of base metal used. Additionally, the effects of varying the design parameters of the pole, handhole, and base plate were explored in a parametric study using finite element modeling. The computational work performed included: varying pole, hand hole, and base plate geometries; performing a comparison between the original reinforcing rim handhole detail and a proposed doubler plate handhole detail; and an analysis of a new HMIP design proposed by KDOT. The finite element analyses were performed using both design-level fatigue loading and a loading estimated from the large-amplitude first mode displacement shown in the video during the “bomb cyclone” weather event. Finite Element Model of HMIP Original Design (pre-2019)
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