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Computers and Concrete Volume 5, Number 4, August 2008 , pages 389-400 DOI: https://doi.org/10.12989/cac.2008.5.4.389 |
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Cohesive modeling of dynamic fracture in reinforced concrete |
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Rena C. Yu, Xiaoxin Zhang and Gonzalo Ruiz
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| Abstract | ||
| In this work we simulate explicitly the dynamic fracture propagation in reinforced concrete beams. 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 mouth opening displacement history, a two-stage crack propagation, marked by the attainment of the peak load, is observed. The first stage corresponds to the stable crack advance, the second one, the unstable collapse of the beam. | ||
| Key Words | ||
| dynamic fracture; cohesive elements; crack propagation time. | ||
| Address | ||
| Rena C. Yu, Xiaoxin Zhang and Gonzalo Ruiz : ETSI de Caminos, C.y P., Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain | ||