United States Department of Transportation
i
Confinement Effect of Metal Railing Narrow Baseplates on Adhesive Anchor Breakout Resistance
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2019-08-01
[PDF-2.10 MB]
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Edition:Final Report May 2017 – July 2019
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Abstract:An updated AASHTO LRFD Bridge Design Specification introduces a new provision for the design of anchors that borrows from the American Concrete Institute Building Code Requirements for Structural Concrete (ACI 318-14). Unfortunately, the ACI 318-14 adhesive anchor design provisions are very conservative by not taking the compressive confinement effect into consideration. The primary objectives of the Florida DOT sponsored research project BDV28 977-06 were to determine the confinement effect of a narrow baseplate on adhesive anchor breakout resistance and develop a new confinement modification factor. Results indicate that the compression confinement from the baseplate significantly increases the concrete breakout resistance. A new confinement modification factor has been developed to address the increase in concrete breakout resistance.
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