Long-Term Performance of a CFRP Strap Shear Retrofitting System


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Title: Long-Term Performance of a CFRP Strap Shear Retrofitting System

Author(s): N. Hoult and J. Lees

Publication: Special Publication

Volume: 230


Appears on pages(s): 685-704

Keywords: beams; CFRP; concrete; fatigue; long-term; retrofitting; shear

Date: 10/1/2005

A shear retrofitting method for reinforced concrete (RC) beams has beendeveloped that uses external CFRP straps to provide additional shear capacity.Research has been undertaken to develop an installation technique that allows theCFRP strap to encompass the full depth of the beam, without requiring access to the topsurface of the beam. The current testing scheme investigates the durability of the CFRPstrap system using the new installation technique. A long-term load test was conductedon a RC T-beam which indicated that the straps continued to provide shear capacityafter 7 months under a load equivalent to 80% of the ultimate capacity of the retrofittedbeam. A cyclic test conducted on another similar T-beam specimen demonstrated thatafter 1,000,000 cycles, under a load that varied between 0.5 and 0.8 times the ultimateretrofitted beam capacity, the straps continued to provide effective shearenhancement.