Structural Behavior of Long Span Overhead Sign Support Bridges
- 1 infraTECH Engineers and Innovators, LLC, Houston, Texas, USA
Abstract
Overhead sign-support bridges that allow displaying necessary information for travelers across the multiple lanes in highways often use large message sign panels: static message sign (SMS) panels or dynamic message sign (DMS) panels. Along with conventional SMS panel, the use of DMS panel is increasing in highways over time owing to their effective capability to guide the travelers in real-time. A 230-ft long span 4-chord overhead steel truss bridge attached with SMS and DMS panel has been studied through extensive finite element analysis to observe the structural integrity. The static wind load was applied in model truss for four different configurations as per 2016 AASHTO LRFD design specification. The innovative structural detailing approach for truss end support and connection detailing for toll-equipment supporting frame was proposed based on static analysis. The present study will help engineers to design overhead sign support bridges by ensuring both public safety and structural integrity.
- Kozy, B. and Earls, C.J. (2005) Bearing Capacity in Long-Span Tubular Truss Chord. ASCE Journal of Structural Engineering, 133, 356-367. https://doi.org/10.1061/(ASCE)0733-9445(2007)133:3(356)
- Li, X., Whalen, T.M. and Bowman, M.D. (2005) Fatigue Strength and Evaluation of Double Mast Arm Cantilevered Sign Structures. Transportation Research Record, 1928, 64-72. https://doi.org/10.1177/0361198105192800107
- Arabi, S., Shafei, B. and Phares, B.M. (2019) Investigation of Fatigue in Steel Sign-Support Structures under Diurnal Temperature Changes. Journal of Constructional Steel Research, 153, 286-297. https://doi.org/10.1016/j.jcsr.2018.09.024
- Arabi, S., Shafei, B. and Phares, B.M. (2018) Fatigue Analysis of Sign-Support Structures during Transportation under Road-Induced Excitations. Engineering Structures, 164, 305-315. https://doi.org/10.1016/j.engstruct.2018.02.031
- Alduse, B.P., Jung, S., Vanli, O.A. and Kwon, S.D. (2015) Effect of Uncertainties in Wind Speed and Direction on the Fatigue Damage of Long-Span Bridges. Engineering Structures, 100, 468-478. https://doi.org/10.1016/j.engstruct.2015.06.031
- Chang, B., Phares, B.M., Zou, H. and Couch, T. (2014) Thermal Analysis of Highway Overhead Support Structures. Transportation Research Record, 2406, 32-41. https://doi.org/10.3141/2406-04
- Hosch, I.E., Fouad, F.H., Gallow, M. and Traylor, L. (2017) Operational Post Deformation of Cantilever Sign Support Structures from Truck-Induced Wind Gusts. Practice Periodical on Structural Design and Construction, 23, 04017033. https://doi.org/10.1061/(ASCE)SC.1943-5576.0000352
- Hong, H.P., Zu, G.G. and King, J.P.C. (2016) Estimating Fatigue Design Load for Overhead Steel Sign Support Structures under Truck-Induced Wind Pressure. Canadian Journal of Civil Engineering, 43, 279-286. https://doi.org/10.1139/cjce-2015-0158
- Hosch, I.E. and Fouad, F.H. (2009) Fatigue Design of Sign Support Structures for Loading Caused by Natural Wind Loads. Transportation Research Record, 2131, 15-22. https://doi.org/10.3141/2131-02
- Kacin, J., Rizzo, P. and Tajari, M. (2010) Fatigue Analysis of Overhead Sign Support Structures. Engineering Structures, 32, 1659-1670. https://doi.org/10.1016/j.engstruct.2010.02.014
- AASHTO LRFD (2016) LRFD Specifications for Structural Supports for Highway Signs, Luminaries, and Traffic Signals. American Association of State Highway and Transportation Officials (AASHTO), Washington, DC.