SEISMIC PERFORMANCE OF REINFORCED CONCRETE BRIDGE COLUMNS

Eight columns were tested under multiple El Centro earthquake motions until failure using a shake table. Four columns were detailed using pre-1971 Caltrans guidelines while four used new current details. The four older columns were flexural columns while the new columns consisted of two designed for flexural failure and two for shear failure. The first column (as-built) failed due to severe lap-splice failure at very low ductility. The second and third columns were retrofitted with a steel jacket while the fourth used a carbon wrap. The columns performed well based on ductility but the lap-splice did not reach yielding as per design. The carbon wrap performed significantly better than the steel jacket retrofits, providing higher lap-splice bar strains and larger ductility. The flexurally dominated new columns had the same configuration as the older style column with the addition of more confining reinforcement. These columns had an aspect ratio of 6.5. Columns preformed well with significant spalling and bar buckling at the end of the test. The two shear dominated columns had an aspect ratio of 3. The shear columns were tested in double curvature using a unique dual link system. The two sets were subjected to different loading paths. In the shear column, a severe shear failure followed by total collapse occurred at 3.25 x El Centro. The collapse was significantly affected by axial load. Current shear capacity equations were used to compare measured versus calculated capacity. Strain rate was shown to be significant for the columns.

• Corporate Authors:

  Multidisciplinary Center for Earthquake Engineering Research

  State University of New York, 107 Red Jacket Quadrangle, P.O. Box 610025
  Buffalo, NY  United States  14261-0025
• Authors:
  • Sanders, David
  • Laplace, P
  • Saiidi, S
  • El-Azazy, S
• Conference:
  • Third National Seismic Conference and Workshop on Bridges and Highways: Advances in Engineering and Technology for the Seismic Safety of Bridges in the New Millennium
  • Location: Portland, Oregon
  • Date: 2002-4-28 to 2002-5-1
• Publication Date: 2002-3-11

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 345-356

Subject/Index Terms

• TRT Terms: Axial loads; Carbon; Collapse; Columns; Ductility; Earthquake resistant design; Flexural strength; Jacketing (Strengthening); Performance; Reinforced concrete bridges; Retrofitting; Shaking table tests; Shear strength; Steel; Strain (Mechanics)
• Uncontrolled Terms: Lap-splice failure; Shear capacity equations
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00933607
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 4 2002 12:00AM