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dc.contributor.authorSenior, Hunter
dc.contributor.authorBennett, Caroline
dc.contributor.authorCollins, William
dc.contributor.authorLi, Jian
dc.contributor.authorEwing, Mark
dc.contributor.authorFadden, Matt
dc.date.accessioned2020-10-15T13:45:09Z
dc.date.available2020-10-15T13:45:09Z
dc.date.issued2019-07
dc.identifier.citationSenior, H., Bennett, C., Collins, W., Li, J., Ewing, M., and Fadden, M., "Dynamic Performance of Cantilevered Sign Trusses for Fatigue," SM Report No. 133, The University of Kansas Center for Research, Inc., Lawrence, KS, July 2019, 179 pp.en_US
dc.identifier.urihttp://hdl.handle.net/1808/30774
dc.description.abstractCantilevered overhead sign structures (COSS) experience cyclic loading due to stochastic loads such as natural wind gusts (NWG). Wind loading can produce large deflections in the cantilever and large-magnitude stresses can develop at the box-type connection between the cantilevered arm and mast where fatigue performance is a concern. Modifications to the sign structures pose further concerns as changes to the aerodynamic properties could have unintended consequences. A design consideration of COSS is serviceability of the sign through use of a steel grate walkway that workers can use for maintenance on the sign. The steel grate walkways on COSS are rarely used for maintenance anymore, hence are being removed by multiple state DOTs to prevent vandalism. However, the impact on COSS with the removal of the walkways is unknown. This report describes an investigation in which the dynamic and aerodynamic properties of COSS was studied, and the effect of the walkway presence on structural response was explored. Computer simulations of 32 different COSS configurations were carried out to see the effect of the grate removal on the natural frequency and the mass of the overall structural system. Aerodynamic performance was considered through the use of computational fluid dynamics (CFD) and experimental testing, where wind pressure on the sign in both axial directions and effects of vortex shedding were examined. Findings include: 1) the walkway had a minimal effect on the system’s mass and natural frequencies, 2) the walkway had a minimal influence on the wind-induced force on the sign, 3) vortex shedding was not exacerbated with removal of a walkway attachment, and 4) walkway removal did not significantly change stress magnitudes at the connection between the cantilever and mast. Based on these findings, the removal of walkways from KDOT’s COSS was not found to problematic.en_US
dc.description.sponsorshipThe Kansas Department of Transportationen_US
dc.publisherUniversity of Kansas Center for Research, Inc.en_US
dc.relation.ispartofseriesSM Report;133
dc.relation.isversionofhttps://iri.ku.edu/reportsen_US
dc.titleDynamic Performance of Cantilevered Sign Trusses for Fatigueen_US
dc.typeTechnical Reporten_US
kusw.kuauthorSenior, Hunter
kusw.kuauthorBennett, Caroline
kusw.kuauthorCollins, William
kusw.kuauthorLi, Jian
kusw.kuauthorEwing, Mark
kusw.kuauthorFadden, Matt
kusw.kudepartmentCivil, Environmental & Architectural Engineeringen_US
kusw.kudepartmentAerospace Engineeringen_US
kusw.oastatusna
dc.identifier.orcidhttps://orcid.org/0000-0001-5982-6219en_US
dc.rights.accessrightsopenAccessen_US


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