Numerical Simulation of CFRP-Repaired Reinforced Concrete molumns

摘要

Damage to bridge structures during an earthquake can have devastating social and economic consequences, particularly for bridges located along key routes critical for emergency response and other essential functions. According to ATC 18, damage to important bridges should be repairable within three days. Thus rapid and effective repair methods for varying levels of damage are needed to enable quick opening of these bridges and to minimize impact on the community. The subject of this study is the rapid repair of severely-damaged concrete bridge columns under combined loading effects. The term 'rapid' in the context of this study refers to a 3-day time period as defined in the literature. Research in this field is currently limited to the repair of columns with slight to moderate damage levels; thus this research will fill in a critical gap in the literature with respect to the severe damage level. In this study, one-half scale concrete bridge columns that have been tested to failure as part of a separate ongoing study are repaired using externally-bonded carbon fiber reinforced polymer (CFRP) wrap. The repaired columns are then tested under the same loading regime as the original columns, combined action of bending, shear, torsion, and axial effects, and the behavior is compared directly with the original response. Since the current literature contains little information with respect to repair of columns subjected to torsion, the inclusion of torsion in the combined loading is a significant contribution to the state of knowledge, and represents a more comprehensive and realistic loading condition than without. Results of this study will also serve as the basis for and add credibility to future proposals on repair of damaged reinforced columns, with high potential for collaboration with leading researchers in this field.