Issue 63

I. Harba et alii, Frattura ed Integrità Strutturale, 63 (2023) 190-205; DOI: 10.3221/IGF-ESIS.63.16

Tension stiffening of concrete

Tension damage in concrete

Stress/MPa

Cracking strain

d t

Cracking strain

2.550 2.123 1.398 0.818 0.476 0.318 0.224 0.171 0.141 0.128 0.088

0

0

0

0.000084 0.000161 0.000302 0.000553 0.000894 0.001397 0.002111 0.002603 0.003005 0.005005

0.1104 0.2776 0.5492 0.7920 0.9004 0.9502 0.9701 0.9790 0.9830 0.9850

0.000084 0.000161 0.000302 0.000553 0.000894 0.001397 0.002111 0.002603 0.003005 0.005005

Table 4: Concrete damage plasticity model constitutive parameters (tension).

Compression hardening in concrete

Compression damage in concrete

Stress/MPa

Crushing strain

d c

Crushing strain

13.576 27.525 30.120 25.119 15.535 11.592

0

0

0

0.00035 0.00075 0.00163 0.00348 0.00470 0.00629 0.00783 0.00935 0.01085 0.01336

0.1154 0.2069 0.4029 0.7074 0.8159 0.8905 0.9273 0.9482 0.9601 0.9721

0.00035 0.00075 0.00163 0.00348 0.00470 0.00629 0.00783 0.00935 0.01085 0.01336

7.605 5.893 4.798 4.038 3.195

Table 5: Concrete damage plasticity model constitutive parameters (compression).

Figure 3: (a) Specimen’s model, (b) Steel configuration and (c) Specimen’s mesh

To match the load-defection curves for theoretical and experimental samples, several attempts were performed. Also, the meshing size of the steel bar, concrete, and CFRP elements were examined. The mesh sizes ranged from 10 to 40 mm with an increment of 5 mm. The best assessment was realized at the mesh size of 20 mm for steel bars and steel plate elements. Also, for concrete and CFRP elements, the selected mesh size was 10 mm. The viscosity parameter values used ranged from

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