Deflection Control of Reinforced Concrete Beams and One-Way Slabs with Externally Bonded FRP

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Title: Deflection Control of Reinforced Concrete Beams and One-Way Slabs with Externally Bonded FRP

Author(s): C.E. Ospina

Publication: Special Publication

Volume: 264

Issue:

Appears on pages(s): 129-146

Keywords: deflection control; deflections; FRP-strengthened members; serviceability design; tension stiffening.

Date: 10/1/2009

Abstract:
Recommendations for the serviceability design of concrete structures strengthened with externally bonded Fiber-reinforced Polymer reinforcement (EBFRP) are scarce. This paper intends to fill this void by presenting several procedures for the direct and indirect control of deflections in concrete beams and one-way concrete slabs strengthened with EBFRP. Two types of formulations for direct and indirect deflection control are proposed: based on Branson’s effective moment of inertia approach and based on the concept of limiting curvatures. The procedures account for the mechanical properties of both the unstrengthened and strengthened member, including those of the EBFRP, and the load level at which the FRP is installed. The effects of tension stiffening on deflection control are also evaluated.