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Fracture mechanics applied to concrete
The aim of this contribution is to show the value of fracture mechanics tools in dealing with engineering fracture problems of concrete, either plain or reinforced. The first part is a review of modeling concrete fracture in tension: the suitability of linear elastic fracture mechanics (LEFM) as an asymptotic approach is considered first, followed by an outline of classical fracture models based on stress-strain relations and their associated problems of non-objectivity. And, finally, cohesive process zone models based on stress-displacement relations are shown to be one of the simplest models capturing the essential features of fracture processes in concrete. The second part gives some practical examples of application of fracture mechanics to concrete, mostly drawn from the author's experience: the difference between strength and toughness in concrete is clearly shown in the example of piles. The size effect in flexural strength, unobtainable with classical strength theories, is accurately predicted with the cohesive process zone model. For plain concrete and large concrete structures such as dams, LEFM was proven suitable. Fracture in reinforced concrete is a more involved problem; nevertheless some promising results for lightly reinforced concrete beams are discussed. The paper ends with some comments on fracture of fiber reinforced concrete (FRC) and an application of this concept to the fracture of FRC tunnel lining, presented in a Japanese standard.
Fracture mechanics applied to concrete
The aim of this contribution is to show the value of fracture mechanics tools in dealing with engineering fracture problems of concrete, either plain or reinforced. The first part is a review of modeling concrete fracture in tension: the suitability of linear elastic fracture mechanics (LEFM) as an asymptotic approach is considered first, followed by an outline of classical fracture models based on stress-strain relations and their associated problems of non-objectivity. And, finally, cohesive process zone models based on stress-displacement relations are shown to be one of the simplest models capturing the essential features of fracture processes in concrete. The second part gives some practical examples of application of fracture mechanics to concrete, mostly drawn from the author's experience: the difference between strength and toughness in concrete is clearly shown in the example of piles. The size effect in flexural strength, unobtainable with classical strength theories, is accurately predicted with the cohesive process zone model. For plain concrete and large concrete structures such as dams, LEFM was proven suitable. Fracture in reinforced concrete is a more involved problem; nevertheless some promising results for lightly reinforced concrete beams are discussed. The paper ends with some comments on fracture of fiber reinforced concrete (FRC) and an application of this concept to the fracture of FRC tunnel lining, presented in a Japanese standard.
Fracture mechanics applied to concrete
Anwendung der Bruchmechanik auf Beton
Elices, M. (author) / Planas, J. (author) / Guinea, G.V. (author)
2000
28 Seiten, 18 Bilder, 5 Tabellen, 77 Quellen
Conference paper
English
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