Abstract
Many steel truss railroad bridges use tension members consisting of eyebars. After years of service, these eyebars may exhibit significant wear at the pin holes, leading to the development of unequal tension stresses among eyebars within the same set. To restore bridge performance, eyebar tensions are often equalized through flame-shortening, where the tension in any eyebar is determined by measuring its fundamental natural frequency and then converting this frequency to the corresponding tension through a simple analytical model. In practice this model assumes that the ends of the eyebar are pinned; however, for transverse vibration about the minor axis, a significant degree of rotational restraint will often exist, potentially resulting in very inaccurate tension estimates. This paper presents the results of analytical studies, model testing, and field observations that focus on improving the prediction of eyebar tensions from observed natural frequencies. Besides supporting the flame-shortening process, the ability to achieve greater accuracy in tension measurements also provides for valuable applications to bridge rating.
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References
American Railway Engineering and Maintenance-of-Way Association (AREMA), “Section 1.12: Pins and Pin-Connected Members”, Manual for Railway Engineering, 15-1-71, 2010.
American Railway Engineering and Maintenance-of-Way Association (AREMA), “Article 3.1.14: Pin Clearances”, Manual for Railway Engineering, 15-3-8, 2010.
American Railway Engineering and Maintenance-of-Way Association (AREMA), “Section 8.2: Method of Shortening of Eyebars to Equalize Stress”, Manual for Railway Engineering, 15-8-10 – 15-8-12, 2010.
Mazurek, D.F., “Evaluation of Common Method for Eyebar Tension Measurement”, Proceedings of the 2010 Structures Congress, American Society of Civil Engineers, 2010, 62–73.
Timoshenko, S., Young, D.H., and Weaver, W., Vibration Problems in Engineering, 4e, John Wiley & Sons, 453–454.
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© 2011 Springer Science+Businees Media, LLC
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Mazurek, D.F. (2011). Effects of End Restraint on Eyebar Behavior in Bridges. In: Proulx, T. (eds) Experimental and Applied Mechanics, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-0222-0_37
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DOI: https://doi.org/10.1007/978-1-4614-0222-0_37
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