Abstract
Fracture tests of postfire normal concrete with ten temperatures up to 600°C are implemented. Residual fracture toughness using analytical method is determined. Two situations are divided at critical load when calculating the cohesive fracture toughness. The initial and critical fracture toughness could be calculated from the complete load-crack opening displacement curves. Finally, the validation of double-Kfracture model to the postfire concrete specimens is proved.
Highlights
The fracture process of concrete structures underwent three main stages: (i) crack initiation, (ii) stable crack propagation, and (iii) unstable fracture
The double-K fracture criterion initially introduced by Xu and Reinhardt [1] showed the crack initiation, crack propagation, and failure during a fracture process until the maximum load is reached
It was found that the influence of ao/D ratio and shape of test specimen on the values of fracture parameters were relatively less than the one of size effect
Summary
The fracture process of concrete structures underwent three main stages: (i) crack initiation, (ii) stable crack propagation, and (iii) unstable fracture. The two size-independent parameters, initial cracking toughness, KIini, and unstable fracture toughness, KIun, can be used to study the crack propagation of concrete. The influences of geometrical parameter [5,6,7] and size effect [2, 3, 8] on fracture toughness were studied by various researchers. It was found that the influence of ao/D ratio and shape of test specimen on the values of fracture parameters were relatively less than the one of size effect
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