STRENGTH AND FAILURE MECHANISM OF RC T-BEAMS STRENGTHENED WITH CFRP PLATES

摘要

Advanced photogrammetry measurement technique was used to study the deformation mechanism of shear deficient reinforced concrete T-beams post strengthened with web bonded L-shaped CFRP laminate strips. Four large-scale T-beams with identical reinforcement details were fabricated and tested to failure. Three of the beams were shear strengthened with the external CFRP reinforcement at different spacing. All beams were designed to exhibit shear failure. Approximately 1500 monitoring points or targets were placed on the beams' and CFRP reinforcement's surfaces to record the positions of the individual targets at selected load levels. All beams were instrumented to measure strain in the CFRP reinforcement, deflections of the beams and slip between the CFRP and concrete at selected locations. Photogrammetry measurement and experimental results are presented.