We'd like to understand how you use our websites in order to improve them. Register your interest. In this study, the effects of repeated loads on the FRP-concrete bond strength were investigated experimentally by direct pull out tests according to CSA S A conventional reinforcing steel bar and two types of glass-fiber-reinforced plastic GFRP bars were embedded in concrete and tested under four different loading patterns.
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Single user license only. Storage, distribution or use on network prohibited. Note: This Annex is a mandatory part of this Standard. C1 Scope This annex specifies a test method for determining the tensile strength, modulus of elasticity, and ultimate elongation of FRP reinforcements.
C3 Apparatus C3. The machine shall have a loading capacity exceeding the expected strength of the specimen and shall preferably be equipped with strain-rate or load-rate control. Note: Universal testing machines may not have enough clearance to accommodate the relatively long anchors required by specimens of high load capacity.
Special testing frames may be required in such cases. Alternatively, another anchoring device may be used provided that it satisfies the following conditions: a The load shall be transmitted to the specimen without any eccentricity or torsion. Note: For specimens of high load capacity, such as multiwire tendons of kN capacity or greater, special grips are needed and may have to be supplied by the manufacturer.
The device shall be compatible with the data acquisition system. The minimum resolutions shall be N for load, one microstrain for strain, and 0. C4 Specimens. No chemical or mechanical alteration, such as machining of the specimens, shall be made for the purpose of testing. To obtain specimens from grids and cages, cutting the cross bars too close to the specimen bar shall be avoided. Leaving a 2 mm projection of the cross bars is good procedure for enhancing gripping. C6 Procedure C6.
For other anchors, the mounting shall ensure concentric and torsion-free loading. The specimen shall not be damaged in any manner in the process of mounting the strain- and displacement-measurement devices. For machines with displacement control only, the desirable strain rate may be obtained by dividing the desirable stress rate by the estimated modulus of elasticity.
If the testing machine is equipped with neither load control nor displacement control, a timing device may be used to observe the time taken to apply a known increment of stress. C7 Calculations C7. Ultimate elongation shall be rounded to the nearest one-tenth of a percentage point.
The average values of these three quantities for the set of specimens tested shall also be reported. V-grip of machine. FRP specimen anchor. Figure C1. See Clause C6. Learn more about Scribd Membership Home. Much more than documents. Discover everything Scribd has to offer, including books and audiobooks from major publishers.
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Standards Council of Canada
Single user license only. Storage, distribution or use on network prohibited. Note: This Annex is a mandatory part of this Standard. A1 Scope This Annex specifies a method for determining the cross-sectional area of FRP reinforcements of all shapes and sizes by the water-displacement method. A3 Apparatus. The container shall have a rigid cap with a 5 mm diameter hole that fits without any slack and does not allow water to leak from the cylinder brim see Figure A1. Note: The container may be made from either a glass or a clear and rigid plastic tube by sealing one end with a flat plastic disk glued to the squarely cut tube end.
Experimetal study on the FRP-concrete bond behavior under repeated loadings
Since the mechanical properties of GFRP fiberglass rebar differ from those of steel, design engineers should consider recommendations made in published design and construction guides prior to using GFRP fiberglass rebar in their structures. Several important differences between steel and GFRP fiberglass rebar should be considered prior to designing your concrete structures using fiberglass rebar:. There are extensive publications existing dealing with the design and usage of GFRP rebar. They include but are not limited to:. Several important differences between steel and GFRP fiberglass rebar should be considered prior to designing your concrete structures using fiberglass rebar: Direct substitution of GFRP fiberglass rebar with steel rebar may not be possible in some cases A lower modulus of elasticity and shear strength may impact the number of reinforcing bars required GFRP fiberglass rebar has a limited maximum sustained shear stress. Guaranteed design tensile strength of fiberglass rebar has to be de-rated in certain applications Some types of GFRP fiberglass rebar are not suitable for certain pre-stressing or post-tensioning applications There are extensive publications existing dealing with the design and usage of GFRP rebar. Sami Rizkalla, Dr.
CAN CSA S806-02[115-119]
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