United States Department of Transportation
i
Seismic performance of circular reinforced concrete bridge columns constructed with grade 80 reinforcement.
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2014-08-01
[PDF-30.74 MB]
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Abstract:This project assessed the use of ASTM A706 Grade 80 reinforcing bars in reinforced concrete columns.
Grade 80 is not currently allowed in reinforced concrete columns due to lack of information on the
material characteristics and column performance. Six half-scale, circular columns were tested: three
constructed with Grade 60 reinforcement and three constructed with Grade 80 reinforcement. Designs
followed standard design methodologies used by State Highway Agencies (including AASHTO).
Results indicate that columns constructed with Grade 80 reinforcement performed similar to columns
constructed with conventional ASTM A706 Grade 60 reinforcement. Computational modeling was
performed using OpenSees for all six columns. Results indicate that the columns constructed with
Grade 80 reinforcement achieved similar resistance and displacement and curvature ductility values
when compared with the reference columns constructed with Grade 60 reinforcement. The columns
constructed with Grade 60 reinforcement showed larger hysteretic energy dissipation than the columns
constructed with Grade 80 reinforcement.
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