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Fracture mechanic modeling of fiber reinforced polymer shear-strengthened reinforced concrete beam

Shahbazpanahi, Shahriar / Abang Ali, Abang Abdullah / Kamgar, Alaleh / Farzadnia, Nima

A numerical method is developed to model shear-strengthening of reinforced concrete beam by using fiber reinforced polymer (FRP) composites. Tensile crack is simulated by a non-linear spring element with softening behavior ahead of the crack tip to model the cohesive zone in concrete. A truss element is used, parallel to the spring element, to simulate the energy dissipation rate by the FRP. The strain energy release rate is calculated directly by using a virtual crack closure technique. It is observed that the length of the fracture process zone (FPZ) increases with the application of FRP shear-strengthening. The present model shows that the main diagonal crack is formed at the support in the control beam while it appears through the shear span in the shear-strengthened beam. Another important observation is that the load capacity increases with the number of CFRP sheets in the shear span.

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Fracture mechanic modeling of fiber reinforced polymer shear-strengthened reinforced concrete beam

Shahbazpanahi, Shahriar / Abang Ali, Abang Abdullah / Kamgar, Alaleh / Farzadnia, Nima

A numerical method is developed to model shear-strengthening of reinforced concrete beam by using fiber reinforced polymer (FRP) composites. Tensile crack is simulated by a non-linear spring element with softening behavior ahead of the crack tip to model the cohesive zone in concrete. A truss element is used, parallel to the spring element, to simulate the energy dissipation rate by the FRP. The strain energy release rate is calculated directly by using a virtual crack closure technique. It is observed that the length of the fracture process zone (FPZ) increases with the application of FRP shear-strengthening. The present model shows that the main diagonal crack is formed at the support in the control beam while it appears through the shear span in the shear-strengthened beam. Another important observation is that the load capacity increases with the number of CFRP sheets in the shear span.

Fracture mechanic modeling of fiber reinforced polymer shear-strengthened reinforced concrete beam

Shahbazpanahi, Shahriar / Abang Ali, Abang Abdullah / Kamgar, Alaleh / Farzadnia, Nima

A numerical method is developed to model shear-strengthening of reinforced concrete beam by using fiber reinforced polymer (FRP) composites. Tensile crack is simulated by a non-linear spring element with softening behavior ahead of the crack tip to model the cohesive zone in concrete. A truss element is used, parallel to the spring element, to simulate the energy dissipation rate by the FRP. The strain energy release rate is calculated directly by using a virtual crack closure technique. It is observed that the length of the fracture process zone (FPZ) increases with the application of FRP shear-strengthening. The present model shows that the main diagonal crack is formed at the support in the control beam while it appears through the shear span in the shear-strengthened beam. Another important observation is that the load capacity increases with the number of CFRP sheets in the shear span.

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Title:

Fracture mechanic modeling of fiber reinforced polymer shear-strengthened reinforced concrete beam

Contributors:

Shahbazpanahi, Shahriar (author) / Abang Ali, Abang Abdullah (author) / Kamgar, Alaleh (author) / Farzadnia, Nima (author)

Published in:

Composites, Part B: Engineering ; 68 ; 113-120

Publication date:

2015

Size:

8 Seiten, 39 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.compositesb.2014.08.041

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Polymermatrix-Verbundwerkstoff , Bruch , Finite-Elemente-Analyse , Energiedissipation , Komposit , Federelement , faserverstärkter Kunststoff , bewehrter Beton , Rissspitze , Verformungsenergie , Tragfähigkeit , Polymer , Bruchmechanik , numerische Methode , Verschließtechnik , Freisetzungsrate

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