Seismic Performance of High-Strength Steel RC Bridge Columns
Publication: Journal of Bridge Engineering
Volume 21, Issue 2
Abstract
This paper presents the results of a testing program developed to assess the performance of circular RC bridge columns constructed with ASTM A706 Grade 80 [550] high-strength steel (HSS) reinforcement. Two pairs of columns were tested (four columns in total). The columns were subjected to lateral cyclic loading to determine the effects of steel reinforcement grade (yield strength) and of moment–shear span ratio on column performance. Each pair consisted of one column constructed with Grade 80 [550] HSS reinforcement and a control column constructed with Grade 60 [420] reinforcement. The first pair had a moment–shear span ratio of six (6), and the second pair had a moment–shear span ratio of three (3). All four columns were designed to have similar nominal bending-moment capacities. Results indicate that the columns constructed with Grade 80 [550] HSS reinforcement achieve similar resistance, similar maximum lateral displacements, and similar curvature ductility values when compared with the control columns constructed with Grade 60 [420] reinforcement. However, columns constructed with Grade 80 [550] reinforcement exhibited lower hysteretic energy dissipation than the control columns. Results also indicate that, independently of the steel grade, as the moment–shear span ratio decreases, the maximum drift ratio decreases, despite an increase in the displacement ductility.
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Acknowledgments
The authors would first like to acknowledge the Oregon Department of Transportation (ODOT) and the Pacific Northwest Transportation Consortium Region 10 (PacTrans) for providing the funding for this research project under the Grant No. SRS 500-610. At ODOT, great support was provided by Steven Soltezs, Bruce Johnson, Craig Shike, and other engineers at the ODOT’s Bridge Standards and Bridge Design units. The authors thank Michael Dyson and James Batti for their technical assistance during testing. Several graduate and undergraduate students also contributed at various levels to work performed in the laboratory; their help on this project is truly appreciated. Special thanks to Thomas Murphy and Dennis Lauber from Cascade Steel (McMinnville, OR) for producing a special heat of the Grade 80 [550] HSS steel reinforcement. Fruitful discussions and suggestions by Professors Mark Eberhard and John Stanton from University of Washington are also acknowledged.
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Information & Authors
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Published In
Journal of Bridge Engineering
Volume 21 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 31, 2014
Accepted: Dec 16, 2014
Published online: Jun 30, 2015
Discussion open until: Nov 30, 2015
Published in print: Feb 1, 2016
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