Evaluation of minimum thickness requirements for FRP reinforced concrete
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Date
2015
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Publisher
University of New Brunswick
Abstract
Flexural design of fibre reinforced polymer (FRP) reinforced concrete members can be an
iterative and time-consuming approach. Recommended minimum member thicknesses
are available for design, but often lead to overly thick members. The research in this
document presents an evaluation of member thickness requirements for FRP reinforced
concrete flexural members ( one way slabs and beams).
A review of design requirements from applicable North American design standards for
FRP reinforced concrete is presented and compared with design requirements for steel
reinforced concrete. Formulations for member span-to-depth (L/h) ratios are developed
for flexural strength, incremental and live load deflection, crack control, creep rupture
requirements, and compressive stress limits in the concrete. Shear strength and
development length are not considered.
An extensive parametric study is carried out to investigate all pertinent design criteria and
show their effects on the applicable design requirements. Results show that flexural
members designed for strength typically do not satisfy serviceability. Design is controlled
mostly by serviceability related to either deflection (slabs and beams) or crack control
(beams using FRP with poor bond). L / h ratios based on incremental deflection
requirements provide a good starting point for design, and are used to establish
recommended values of minimum member thickness as a design aid. Design examples
are presented to demonstrate an efficient design procedure for FRP reinforced concrete.