2001, Volume 3, Issue 4
Strategic Study of CAE >> 2001, Volume 3, Issue 4
The Double-K Fracture Parameter of Concrete for Non-Standard Three Point Bending Beam Specimens
State Key Laboratory of Coastal & Offshore Engineering, Dalian University of Technology, Dalian , Liaoning 116024, China
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Abstract
Using the non-standard three-point bending beam specimens of concrete, which have the span/ height ratio of 2.5, and the maximum load Pmax and the correspoding crack mouth opening displacememt CMODc measured in the experiment, the precritical crack propagation length ∆ac are evaluated by means of linear asymptotic superposition assumption. On this basis, the initiation fracture toughness KiniIC, unstable fracture toughness KunIC and the critical crack tip opening displacement CTODc for the non-standard three point bending beams with different initial crack lengths and different spcimen heights are determined utilizing fictitious crack model. The calculated results show that KunIC is independent of the initial crack length and the specimen height. Meanwhile, KiniIC is size-independent too, when a0/h = 0.3〜0.5. This indicates that the double-K fracture parameter can be considered as a constant for concrete materials.
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References
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