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A Framework for Vibration Attenuation in Traffic Mast Arm Structures under Wind Loads

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Abstract

Traffic signals and information signs play a vivid role in maintaining safe travel by guiding drivers on highways and urban roads. Traffic mast arm structures are susceptible to vibrations induced by wind loads. Fatigue-induced failure is common in these structures. However, it is crucial to ascertain the functionality of signal support structures. This paper lays the foundation for a fully computational framework to model and mitigate wind-induced vibrations in traffic lighting support structures by conducting computational fluid dynamics (CFD) simulations, dynamic modeling, and damping enhancement. We validated the CFD simulations by aerodynamic testing. The dependence of flow pattern and aerodynamic loads on Reynolds number reveals the importance of full-scale CFD with large eddy simulation for wind load estimation on mast arm structures. Distributed tuned mass dampers were created by employing available weights of lighting boxes. The results show that distributed tuned lighting boxes are effective for vibration suppression. Besides, damping enhancement can significantly reduce vibration-induced stresses and hence extend the fatigue life. The proposed mitigation technique promises to save construction costs and improve the safety of the traveling public. The procedure followed for creating time histories of wind loads integrated with finite element modeling applies to other vibration lessening techniques for potential inclusion in the AASHTO standard.

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Acknowledgments

The first author would like to acknowledge the funding support for this research by the Louisiana Department of Transportation and Development (DOTD) through the Louisiana Transportation Research Center (LTRC) (contract number: 14-2TIRE). The discussion with Dr. Walid Alaywan is acknowledged with thanks. The study used the LSU High-Performance Computing (HPC) facilities. The findings and conclusions are those of the authors and do not necessarily represent the official position of the sponsors.

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  1. Windstorm Impact, Science, and Engineering (WISE) Research Lab, Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA

    A. M. Aly, H. Gol-Zaroudi & M. Rezaee

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Aly, A., Gol-Zaroudi, H. & Rezaee, M. A Framework for Vibration Attenuation in Traffic Mast Arm Structures under Wind Loads. Exp Tech 46, 575–593 (2022). https://doi.org/10.1007/s40799-021-00495-9

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