Abstract
Reinforced concrete (RC) slabs can be strengthened using fiber reinforced polymers (FRPs) to enhance their flexural and shear resistance. However, premature debonding of the FRP material limits the level of strengthening achievable and represents an under-utilization of the FRP material. As a result, a variety of anchorage systems have been explored by researchers in an attempt to prevent or delay this type of failure. This paper presents a new FRP patch anchorage system which can be used to mitigate the commonly-observed failure mode of intermediate crack-induced (IC) debonding. This is the first experimental application where patch anchors are investigated in flexurally-strengthened RC slabs. Seven slabs 2700 mm × 400 mm × 150 mm in size were tested. Of these, two were unstrengthened, three were strengthened with 100 mm wide × 1.4 mm thick FRP sheet and two were strengthened in the same manner and anchored with four patch anchors. The use of patch anchors showed significant enhancement of both the strength and ductility of RC slabs compared with unanchored specimens.
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