FraMCoS 6 2007 Catania, Italy

Explicit cohesive crack modeling of dynamic propagation in RC beams

Inthisworkwesimulateexplicitlythedynamicfracturepropagationinreinforcedconcretebeams. In particular, adopting cohesive theories of fracture with the direct simulation of fracture and fragmentation, we represent the concrete matrix, the steel re-bars and the interface between the two materials explicitly. Therefore the crack nucleation within the concrete matrix,…

First page of: Explicit cohesive crack modeling of dynamic propagation in RC beams
Year 2007
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Abstract

Inthisworkwesimulateexplicitlythedynamicfracturepropagationinreinforcedconcretebeams. In particular, adopting cohesive theories of fracture with the direct simulation of fracture and fragmentation, we represent the concrete matrix, the steel re-bars and the interface between the two materials explicitly. Therefore the crack nucleation within the concrete matrix, through and along the re-bars, the deterioration of the concrete- steel interface are modeled explicitly. The numerical simulations are validated against experiments of three- point-bend beams loaded dynamically under various strain rates. By extracting the crack-tip positions and the crack mouthopeningdisplacementhistory,atwo-stagecrackpropagation,markedbytheattainmentofthepeak load, is observed. The first stage corresponds to the stable crack advance, the second one, the unstable collapse of the beam. The main crack propagation patterns are also illustrated for several loading velocities.