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Failure modes for FRP wrapped cylindrical concrete columns
The effect of damage at the cohesive concrete-laminate interface on failure of FRP-reinforced concrete columns is considered. The FRP (fiber reinforced plastics) are composed of epoxy resins and fabrics with different properties (Young's modulus, ultimate strength). Analytical expressions, obtained for the shear stress at the interfacial bond, show that higher fabric thickness and strength result in higher interfacial shear. Hence, as fabric thickness and strength are increased, there is increased likelihood of distress in the bond due to high shear stresses. In case of damage at the interface, the nature of the interfacial bond may change and thus affect the failure load. Damage in the bond is modeled to allow transition from cohesive bond to unbonded contact, using stress-based damage initiation and energy-based damage evolution. Bond failure, resulting in damage to the surface concrete, is found to facilitate failure by fabric rupture through three distinct mechanisms: the growth of local zones of high tensile stress in the surface concrete after bond failure; high shear strains in the surface concrete due to the accumulation of slip at the interface following the initiation of bond failure; high shear strains in the surface concrete due to large elastic slip at the interface prior to bond failure.
Failure modes for FRP wrapped cylindrical concrete columns
The effect of damage at the cohesive concrete-laminate interface on failure of FRP-reinforced concrete columns is considered. The FRP (fiber reinforced plastics) are composed of epoxy resins and fabrics with different properties (Young's modulus, ultimate strength). Analytical expressions, obtained for the shear stress at the interfacial bond, show that higher fabric thickness and strength result in higher interfacial shear. Hence, as fabric thickness and strength are increased, there is increased likelihood of distress in the bond due to high shear stresses. In case of damage at the interface, the nature of the interfacial bond may change and thus affect the failure load. Damage in the bond is modeled to allow transition from cohesive bond to unbonded contact, using stress-based damage initiation and energy-based damage evolution. Bond failure, resulting in damage to the surface concrete, is found to facilitate failure by fabric rupture through three distinct mechanisms: the growth of local zones of high tensile stress in the surface concrete after bond failure; high shear strains in the surface concrete due to the accumulation of slip at the interface following the initiation of bond failure; high shear strains in the surface concrete due to large elastic slip at the interface prior to bond failure.
Failure modes for FRP wrapped cylindrical concrete columns
Dandapat, Ramkrishna (author) / Deb, Arghya (author) / Bhattacharyya, S.K. (author)
Journal of Reinforced Plastics and Composites ; 30 ; 561-579
2011
19 Seiten, 24 Bilder, 3 Tabellen, 21 Quellen
Article (Journal)
English
Failure modes for FRP wrapped cylindrical concrete columns
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