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Title: Impact of using higher strength concrete on the design of prestressed concrete bridges
Authors: Gergess, Antoine 
Sen, Rajan
Affiliations: Department of Civil and Environmental Engineering 
Keywords: AASHTO HL93 live load
Standard AASHTO girders
Parametric study
Subjects: High strength concrete
Issue Date: 2014
Part of: Journal of bridge structures
Volume: 10
Start page: 77
End page: 85
AASHTO highway live loads are sometimes increased to idealize more realistic traffic conditions. Certain regions in the Middle East require increasing the AASHTO HL93 live loads by a 1.5 factor based on comparisons with the British Standards HA+HB live loads. Even in the US, the AASHTO live loads may not always represent modern state-legislated truck configurations. This paper shows the impact of using higher strength concrete on the design of precast, prestressed girders subjected to stringent loading and environmental conditions. A parametric study that relates the girder size and spacing to the span length for HL93 and 1.5 x HL93 live loads as a function of the concrete 28-day strength and environmental classifications is conducted for this purpose. It is shown that increasing the 28-day concrete strength from 40 (5800) to 50MPa (7200 psi) allow increasing the HL93 live load by 50% and reducing the service load tension stress limit from 0.5√fʹc, MPa (6√fʹc, psi) to zero without drastically changing the precast girder size and configuration.
This paper was presented in " Proceedings of the 7th New York City Bridge Conference by CRC Press, Taylor and Francis Group, August 26 – 27, 2013, New York City, NY. ".
Type: Journal Article
Appears in Collections:Department of Civil and Environmental Engineering

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