Abstract
According to the available experimental research related to structures flexurally strengthened by bonding fiber reinforced polymer (FRP) laminates, the laminate debonds in a brittle manner in most tests. This debonding failure usually initiates in the most loaded regions due the effect of intermediate cracks (intermediate crack debonding). From the beginning of this technique, several models have been developed to avoid this premature failure. However, some of them present a significant scatter in relation to the experimental data. This paper presents a comparative analysis of the existing formulations through a database of tests compiled by the authors. Afterwards, a design procedure based on a shear-bending moment interaction diagram related to intermediate crack debonding is presented. This interaction diagram depends on the maximum shear force between crack discontinuities. Finally, the proposed method is compared to the rest of the models obtaining satisfactory results when predicting the failure load.
Highlights
This paper presents a comparative analysis of the existing formulations through a database of tests compiled by the authors
Composites Part B, Elsevier, 40(1): 17-28. doi: 10.106/j.compositesb.2008.07.004
Summary
According to the available experimental research related to structures flexurally strengthened by bonding fiber reinforced polymer (FRP) laminates, the laminate debonds in a brittle manner in most tests. This debonding failure usually initiates in the most loaded regions due the effect of intermediate cracks (intermediate crack debonding). Afterwards, a design procedure based on a shear-bending moment interaction diagram related to intermediate crack debonding is presented. This interaction diagram depends on the maximum shear force between crack discontinuities. Desprendimiento prematuro del laminado: a) debido a fisuración intermedia, b) en el extremo del laminado (b.1 arrancando fina capa recubrimiento, b.2 arrancando recubrimiento hasta armadura pasiva, b.3 formando fisura de cortante)
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