Fatigue design study of Texas Department of Transportation standard specifications for traffic signal and high mast pole structures




Srihi, Mariam

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Failures of traffic signals and high mast pole structures have been an issue worldwide. Forensic studies have revealed that fatigue is the cause of most of the failures. As a result, The fourth edition of the AASHTO Luminaire and Traffic Signal Specification have been revised in its entirety through a major research project conducted under the supervision of the National Cooperative Highway Research Program (NCHRP, Report 469). The current design specification is the fifth edition of the AASHTO. The significant changes to AASHTO past practices have created much larger and more costly structures. Thus, many states became hesitant to adopt the new AASHTO Standards. The impact of the new wind load and fatigue provisions on the design of traffic signal and high mast pole structures had not been updated in Texas, and will be the main goal of this research. Wind load calculation and design of traffic signals and high mast poles in Texas will be performed using the design criteria in the 2009 AASHTO specifications, fifth edition. The results will be compared and the impact of the 2009 specification on design will be illustrated.


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Civil and Environmental Engineering