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Section Shapes for Short-Span UHPC Bridges
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2024-12-01
[PDF-2.86 MB]
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Abstract:Short-span bridge superstructures are commonly made of precast concrete elements, and those elements are proportioned according to the properties of conventional concrete. The emergence of ultra-high-performance concrete (UHPC), and the release of the AASHTO Guide Specification for Structural Design with UHPC, creates new possibilities for the redesign of short-span bridge superstructures. This report provides a discussion on section development and design considerations for UHPC structural components, including background on some of the UHPC structural components used in the U.S. to date, some general limitations to a UHPC section geometry, typical controlling aspects of UHPC structural component design, and the effect of UHPC material properties on design. Three possible UHPC section shapes (multi-stem T-beam, optimized box beam, and optimized NEXT D beam) are presented for span lengths up to 125 feet. Design tables, suggested span lengths, and general design considerations are provided for each section. Several different hypothetical case studies are presented to demonstrate some of the advantages of using UHPC structural components in short-span bridges.
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