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Virginia DOT Studies Repairs for Impacted Bridge Beams

Tuesday, June 19, 2018

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To address damage caused by over-height vehicles impacting bridges, the Virginia Department of Transportation recently released a study addressing feasible repair options to treat anything from minor to catastrophic damage.

According to the Virginia DOT, prestressed strand splices and fiber-reinforced polymer wraps are both traditionally used to repair prestressed concrete beams, and both were examined in the study; a novel alternative repair, a fabric-reinforced cementitious matrix, was also taken into consideration.

Repair Study

In the study, the DOT damaged, repaired and tested four beams retrieved during the replacement of the overpass of Arcadia Road over I-81 in Arcadia, Virginia. Repair techniques evaluated included FRP, FRCM and a combination of FRCM and strand splices.

Virginia Department of Transportation

To address damage caused by over-height vehicles impacting bridges, the Virginia Department of Transportation recently released a study addressing feasible repair options to treat anything from minor to catastrophic damage.

The beams were subject to uniform testing. Loads were also monotonically increased to the point of beam failure, with one undamaged beam serving as a control. The DOT used methods from AASHTO and ACI for hand-calculations of flexural strength, and non-linear beam models as well as non-linear 3D finite element models were also investigated as tools to evaluate repaired beams.

Study results indicate that the greatest amount of original strength was restored with the FRP repair, as well as the repair with the combination of FRCM and splice chucks. Splice chucks are useful in restoring strength and are easily installed, the study notes, but become less reliable when multiple strands in one location are spliced.

As a repair method, FRCM showed promise, but the DOT noted it should be tested in fatigue before being used on a bridge that supports high volumes of truck traffic.

   

Tagged categories: Bridges; Department of Transportation (DOT); Government; NA; North America; Quality Control; Research and development

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