Seismic performance of circular reinforced concrete bridge columns constructed with grade 80 reinforcement.

PDFTech ReportFHWA-OR-RD-15-02SRS 500-610Reinforced concrete bridgesColumnsReinforcing barsEarthquake resistant designHigh strength steelComputer modelsDuctilityUnited StatesPacific Northwest Transportation ConsortiumOregon. Dept. of TransportationTrejo, DavidBarbosa, Andr\uc3\ua9 R.Link, TimOregon State UniversityUnited States. Dept. of Transportation. Research and Innovative Technology AdministrationUS Transportation CollectionThis 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 thematerial characteristics and column performance. Six half-scale, circular columns were tested: threeconstructed with Grade 60 reinforcement and three constructed with Grade 80 reinforcement. Designsfollowed standard design methodologies used by State Highway Agencies (including AASHTO).Results indicate that columns constructed with Grade 80 reinforcement performed similar to columnsconstructed with conventional ASTM A706 Grade 60 reinforcement. Computational modeling wasperformed using OpenSees for all six columns. Results indicate that the columns constructed withGrade 80 reinforcement achieved similar resistance and displacement and curvature ductility valueswhen compared with the reference columns constructed with Grade 60 reinforcement. The columnsconstructed with Grade 60 reinforcement showed larger hysteretic energy dissipation than the columnsconstructed with Grade 80 reinforcement