The fracture instability for damage initiation in flexural reinforced concrete structures, based on FEA results using square reinforcing bars (15mm x 15mm) and HPFRC embedding matrix (30mm cover thickness), is investigated for high cycle loading cases.
Under these conditions, the presence of the transversely continuous embedded structural fibrilsresults in a rise of the critical shear stress above the conventional FEA result since the contribution of the embedded structural fibrils is generally neglected in thepresence of discontinuous reinforcement (Makridakis & Karathanadoris 1994).
An equivalent plastic behaviour criterion is therefore necessary for the three-dimensionalscale finite element model established for the investigation of the crack behaviour of the tested functional form. The equivalent plastic behaviour is defined based on the unconstraint of the embedded reinforcing bars and the discontinuous reinforcement is replaced by a combination of 50% random reinforcement and 50% replacement nodes, as defined in (Wärmer& Wirtz 1994).
Experimental tests have been carried out for the characterization of a adopted embedding Matrix, HPFRC, manufactured in two different composition, as specified in the results as O1 and O2. For each further experimental result the measured and predicted values are shown, and the comparison of the model with the experimentally measured results shows a good agreement.
The use of this model as used for the prediction of the adhesive bridge cracks initiation and propagation, prediction of the further damage development, and the prediction of the final failure load in a composite material with damage.
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