Wind Drag Coefficients for Highway Signs and Support Structures (2023) / Chapter Skim
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Pages 101-105
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From page 101... ...
101 Conclusions 4.1 Applicability of Results to Improving Current Practice The overarching goal of the project was to aid directly in the safe and economical design of highway sign support structures. The project results are of direct practical use to civil engineers who are engaged in the design of highway traffic signs and their support structures.
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From page 102... ...
102 Wind Drag Coefficients for Highway Signs and Support Structures The other main research task undertaken as part of NCHRP Project 15-67 was to propose methods to estimate wind drag coefficients on the members of truss structures and on the tubes and chords of monotube and truss structures supporting highway signs. Although methods were proposed in the past and are being used by some state DOTs, the LRFDLTS-1 specifications have not adopted any of them.
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Conclusions 103 The last effect is not accounted for in the current LRFDLTS-1 specifications. When b/h > 3, the drag coefficient for the static sign sharply increases with higher values of h/(h + hg)
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104 Wind Drag Coefficients for Highway Signs and Support Structures amplification zone)
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From page 105... ...
Conclusions 105 Although the current research project includes recommendations for determining wind loads on vertical columns of circular cross-section used to support monotubes, additional research is needed on how to more accurately calculate the drag coefficients for vertical columns as a function of their cross-section (e.g., circular, hexagonal, dodecagonal, octagonal, square) , Reynolds number, and especially aspect ratio.
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