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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Bond Failure of Concrete Fiber Reinforced Polymer Plates at Inclined Cracks—Experiments and Fracture Mechanics Model
Author(s): U. Neubauer and F. S. Rostasy
Publication: Special Publication
Appears on pages(s): 369-382
Keywords: carbon; debonding; displacemtn; fracture energy; interlaminar plate failure; shear; strength
Abstract:Although a vast number of papers on plate bonding have been published, certain aspects, especially concerning bond have yet been too insufficiently clarified to be adequately considered in practical design. Bond failure is mostly brittle and often occurs a few millimeters deep in the concrete. A fracture mechanics-based engineering model of bond strength for this failure type, derived from pure bond tests exists. In a beam vertical shear crack mouth displacements can reduce bond strength by reducing the total fracture energy, required to destroy the local bond. To quantify this effect, the shear crack mouth displacements have to be calculated, dependent on the acting forces, the geometry, the reinforcement and the material parameters of the beam. Then a mixed mode fracture mechanics approach is used to quantify the loss of bond strength due to simultaneous action of bending and shear. In most cases, bond strength reduction due to vertical shear crack displacement will range around 5-10%. In CFRP-plates another type of debonding failure, specific to fiber reinforced plastics was observed. Interlaminar failure in the plate, preferably occurring with higher-strength concrete is considered a mixed mode fracture problem and was in-vestigated by simultaneous measurements of the mode I and mode II displace-ments of the bond crack with electronic speckle pattern interferometry (ESPI). A fracture mechanics approach to a criterion for interlaminar plate failure was derived. According to this, a surface tensile strength of the concrete of more than 3,0 MPa cannot be taken advantage of in design, since interlaminar plate failure
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