Due to weather conditions, the Florida Highway Patrol has closed the Sunshine Skyway Bridge.
Structures Design
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Structures Design - Transportation Innovation
Geosynthetic Reinforced Soil Integrated Bridge System (GRS-IBS) Commonly referred to as GRS Abutments |
Photo Slideshow
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Overview Informational Photos and Videos Design Criteria Developmental Design Standard Specifications Implementation Plan Usage Restrictions / Parameters Contact |
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GRS abutments are part of
FHWA's Every Day Counts (EDC) initiative
to reduce bridge construction time and cost. A limited number of small bridge
projects have been constructed in other parts of the country using
this technology in combination with precast bridge components. These
projects were considered cost effective and are performing well.
The lessons learned during those projects led to the FHWA's
GRS Guide.
Use of GRS abutments and walls on the Interstate or major multi-lane
highways requires the approval of the State Structures Design
Engineer. GRS abutments are shallow foundations
constructed using a combination of gravel and closely spaced layers
of geotextile or geogrid. The approach to the bridge is integrated
into the GRS abutment in lieu of utilizing an approach slab. Informational
Photos and Videos FHWA produced several videos which provide
background information and testimonials from Engineers across the
country regarding their use of GRS abutments for bridges on public
roads. These videos and several additional construction photos are available at the following FHWA website: http://www.fhwa.dot.gov/everydaycounts/technology/grs_ibs/multimedia.cfm FHWA's construction demonstration video is also available on YouTube. FDOT Design Requirements are provided in Structures Design Bulletin 12-06. Developmental Design Standard D6025 is available for presenting details in the project plans. This Developmental Standard includes details for wrap-around abutments and details for the transition between the roadway guardrail and the bridge railing. Please review the Developmental Design Standards Policy prior to requesting D6025. Construct GRS abutments and wing walls in accordance with Developmental Specification 549. With the exception of Interstate or major multi-lane highway applications, GRS abutments may be utilized, when appropriate and cost effective, on all FDOT projects. Use of GRS abutments on the Interstate or major multi-lane highways requires the approval of the State Structures Design Engineer. Usage Restrictions / Parameters Use of GRS abutments is limited to 1-lane or 2-lane bridges with simply supported end spans of less than 140 feet in length. Abutments are limited to 30 feet in height. The use of GRS abutments on the Interstate or major multi-lane highways requires the approval of the State Structures Design Engineer.
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