Research In Progress Brief: TR-812, Developing a Standard Design for Single Span Concrete Slab Bridges, 2024

(2024) Research In Progress Brief: TR-812, Developing a Standard Design for Single Span Concrete Slab Bridges, 2024. Transportation, Department of

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Abstract

Concrete slab bridges are typically used for single span (20- 50 feet) or multiple span small stream crossings. They are generally regarded as a cost-effective option over bridges with beams for short spans. As a result, they are used widely in the United States. Nearly 10.5% of all highway bridges are classified as concrete slab bridges according to the U.S. 2020 National Bridge Inventory (NBI). Currently, county bridge standard plans maintained by the Iowa Department of Transportation (Iowa DOT) do not have an option for single span concrete slab bridges. Single span concrete slab bridges may be a preferred option over other standardized short span structures including box culverts and box beam bridges due to improved hydraulic performance, less required right-of-way, and reduced streambed disturbance. Recent regulatory changes may drive a shift from culverts to bridges for small streams. Due to the number of short span bridges on secondary roads throughout the state in need of replacement and the limited resources for design, there is a need for additional bridge standards that can be easily and economically employed by Iowa counties and cities.