Data-Based Testing & Decision Process for Traffic Signal Steel Replacement

US Transportation Collection2021PDFTech ReportSorensen, Andrew D.Unobe, Ikwulono DavidBean, BrennanUtah State University. Department of Civil and Environmental EngineeringUtah. Department of Transportation. Research and Innovation DivisionUnited States. Department of Transportation. Federal Highway AdministrationUtah. Dept. of Transportation. Research DivisionUnited StatesDecision makingFatigue (Mechanics)Poles (Supports)Remote sensingService lifeSteel structuresStructural health monitoringWeldmentsWeldsWindTraffic pole fatigueWind load analysisUT-21.0518-8414Final Feb 2018 to Feb 2021A process to estimate the fatigue damage and life expectancy of traffic signal structures under wind loads is presented. Wind speed histories of locations, where these structures are installed, are developed using wind speed data from stations located around the state. These speeds are used in computing fatigue damage at the welded connections at the base of the mast arm and pole, under the assumption that these connections are susceptible to fatigue damage. The fatigue life expectancies of these structures are thus computed. A remote monitoring application is developed using this process. This application is developed to allow operators to remotely obtain an overview of the health of these structures while in service and allow them to make informed decisions and plans with regard to repairs or retrofitting for these structures. Results from using the process on several traffic poles around Logan, Utah, indicate that most of the traffic structures are not in any immediate danger of failing from fatigue damage. However, this is with respect to some simplifying assumptions made about the welded connections and the geometry of the structures. This study aims to assist the Utah Department of Transportation (UDOT) in developing a risk assessment and management plan to properly manage traffic structures and reduce catastrophic failures or collapses.113