Issue 57

M. T. Nawar et alii, Frattura ed Integrità Strutturale, 57 (2021) 259-280; DOI: 10.3221/IGF-ESIS.57.19

in the Figs. 29, that beams with ductile behavior carry a lower dynamic reaction force under same load value. Fig. 30 shows the flexural toughness results for tested beams models under blast loading.

Figures 29: Dynamic reaction-deflection curves for tested beam models using different reinforcement ratios.

When the reinforcement ratio decreases from 0.78% to 0.5%, the results show an increase in the flexural toughness by 6.9% and 9.7% for reinforced concrete beams (B2) and (B3) in comparison with reference beam (B1), reflecting the effect of SFs with volume fractions 1% and 2% respectively. For R.C beams with SMCs (10%MS+1%NS), the results show an increase in the flexural toughness by 18.2%, 27% and 31.8% respectively in comparison with (B1). Fig. 31 illustrates the significant increase in the beam ductility within decreasing the tensile reinforcement ratio.

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