Double brittle-to-ductile transition in bending of fibre reinforced concrete beams with rebars

SUMMARY The bridged crack model has been demonstrated to be an efficient numerical tool for investigating the behaviour of structural elements in bending. In the model, Linear Elastic Fracture Mechanics concepts are used to determine the equilibrium and the compatibility equations of a beam segment subjected to bending in presence of a mode I crack. Recently, the model has been extended to include the presence of closing stresses as a function of the crack opening in addition to steel reinforcement closing traction. This allows the characterization of the mechanical behaviour of fibre reinforced structural elements. Some new techniques, recently introduced for reducing significantly the computing time in presence of cohesive stresses, are presented in the paper and the model is extended by a criterion for detecting concrete crushing in compression. Some experimental results are commented in this light. Copyright # 2004 John Wiley & Sons, Ltd.

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