FIB 14: Externally bonded FRP reinforcement for RC

In December 1996, the then CEB tested a job team with the most target to tricky layout instructions for using FRP reinforcement in line with the layout layout of the CEB-FIP version Code and Eurocode2. With the merger of CEB and FIP into fib in 1998, this job team grew to become fib TG 9.3 FRP Reinforcement for concrete buildings in fee nine Reinforcing and Prestressing fabrics and structures. the duty crew comprises approximately 60 participants, representing so much eu universities, learn institutes and commercial businesses operating within the box of complicated composite reinforcement for concrete constructions, in addition to corresponding participants from Canada, Japan and united states. conferences are held two times a 12 months and at the examine point its paintings is supported by way of the european TMR (European Union education and Mobility of Researchers) community "ConFibreCrete”.

The paintings of fib TG 9.3 is played by means of 5 operating events (WP):

Material trying out and Characterization (MT&C)
Reinforced Concrete (RC)
Prestressed Concrete (PC)
Externally Bonded Reinforcement (EBR)
Marketing and functions (M&A)
This technical document constitutes the paintings carried out as of so far by way of the EBR party.

This bulletin supplies designated layout directions at the use of FRP EBR, the sensible execution and the standard keep watch over, in line with the present services and state of the art wisdom of the duty workforce contributors. it truly is considered as a development record since
it isn't the goal of this report back to disguise all points of RC strengthening with composites. as an alternative, it makes a speciality of these facets that shape the vast majority of the layout problems.
several of the themes provided are topic of ongoing study and improvement, and the main points of a few modelling techniques could be topic to destiny revisions.
as wisdom during this box is advancing swiftly, the paintings of the EBR WP will continue.
Inspite of this restrict in scope, huge attempt has been made to provide a bulletin that's today’s state-of-art within the sector of strengthening of concrete constructions via externally bonded FRP reinforcement.

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Extra info for FIB 14: Externally bonded FRP reinforcement for RC structures

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The analysis of FRP local buckling would involve idealising the FRP as an elastic thin strip supported over an elastic medium of high rigidity. Initial efforts to address the problem are currently under way, but no firm results are available. Local buckling may be avoided by placing compressive stress limitations in the FRP (yet to be established), which are expected to be satisfied in many cases, as permanent compressive stresses in concrete should be kept low too, in order to prevent excessive creep deformations.

The SLS, the amount of FRP provided to the structure may be considerably higher than what is needed for the ULS. In this case, it may be difficult to fulfil the ductility condition while yet high safety factors between the acting (S) and the resisting (R) design load in ULS are obtained (hence also a high safety factor between the service load and the resisting design load). 2S, the ductility condition should no longer be fulfilled. 1 General Reinforced concrete elements, such as beams and columns, may be strengthened in flexure through the use of FRP composites epoxy-bonded to their tension zones, with the direction of fibres parallel to that of high tensile stresses (member axis).

4-9: Bond failure modes of a concrete member with EBR (Blaschko et al. 1998). x Mode 1: peeling-off in an uncracked anchorage zone The FRP may peel-off in the anchorage zone as a result of bond shear fracture through the concrete. x Mode 2: peeling-off caused at flexural cracks Flexural (vertical) cracks in the concrete may propagate horizontally and thus cause peeling-off of the FRP in regions far from the anchorage. x Mode 3: peeling-off caused at shear cracks Shear cracking in the concrete generally results in both horizontal and vertical opening, which may lead to FRP peeling-off.

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