Abstract
A method for quick repair of severely damaged but still standing concrete columns is developed and tested. Two ¼-scale, reinforced concrete (RC) bridge columns specimens were built and tested at a shake table facility of University of California, Berkeley. Both specimens had identical geometric and longitudinal reinforcement details, but different volumetric reinforcement ratios. Total of 11 ground motions with combination of horizontal and vertical excitations were chosen for testing the two specimens. Both specimens had moderate to high shear and flexural damage with cracking and spalling of concrete along the column height. Damaged specimens were then repaired and retrofitted with unidirectional Fiber Reinforced Polymer (FRP) composite sheets by wet lay-up method. The two repaired specimens were subjected to same ground motions used for testing the performance of as-built specimens. Both repaired specimens exhibited better load carrying capacity and ductility than the as-built specimens. FRP jackets on both columns remained intact and the residual displacements were negligible. From the experimental data, it was concluded that the proposed repair could be considered as a permanent strengthening solution of RC bridge columns.
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