Designing FRP Reinforced Concrete for Deflection Control


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Title: Designing FRP Reinforced Concrete for Deflection Control

Author(s): Stuart Veysey and Peter H. Bischoff

Publication: Special Publication

Volume: 275


Appears on pages(s): 1-24

Keywords: beams; deflection; effective moment of inertia; fiber reinforced polymers (FRP); reinforced concrete; serviceability; service loads; strength

Date: 3/1/2011

This paper investigates the design of fiber reinforced polymer (FRP) reinforced concrete based on ACI 440.1R serviceability requirements related to deflection control of one-way slabs and rectangular beams, and uses this information as the basis for evaluating the minimum member thickness requirements needed to satisfy ACI 318 deflection limits. Serviceability is shown to govern design in most cases, as flexural members designed for deflection control are usually stronger than required. Slabs satisfying deflection requirements have a service load that ranges from 20 to 30% of the nominal member capacity, while service loads for beams range from 35 to 45% of the member capacity. Recommended minimum member thickness values for slabs are too conservative and require revision, while those for beams appear reasonable. A practical approach for design of FRP reinforced concrete members is proposed based on selection of member thicknesses needed to satisfy deflection and strength criteria.