Issue 63

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

Group No.

Specimen ID C1A0 C2B0 C3D0 C4E0 C5A10 C6A20 C7A30 C8A40 C9A50 C10B10 C11B20 C12B30 C13B40 C14B50 C15D10 C16D20 C17D30 C18D40 C19D50 C20E10 C21E20 C22E30 C23E40 C24E50

fc ' MPa

e mm

CFRP Layers

t f mm

CFRP ratios %

Remarks Validation Validation Validation Validation

0 0 0 0

0 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

0

25 50

1

100

10 20 30 40 50 10 20 30 40 50 10 20 30 40 50 10 20 30 40 50

0 0 0 0 0

2

25 25 25 25 25 50 50 50 50 50

3

30.12

0.166

4

100 100 100 100 100

5

Table 7: Details of numerical specimens.

R ESULTS AND DISCUSSION

C

urrent numerical study of eccentrically loaded circular short reinforced concrete columns confined with different CFRP ratio was performed using the improved CDP.

Verification of numerical results The differences between numerical and experimental data [43] are shown in Tab. 8. The concentric load – longitudinal displacement and concentric load - lateral strain at columns midpoint curves of specimens in group 1 (C1A0, C2B0, C3D0, and C4E0) obtained from the FE analysis along with the experimental data [43] are compared in Fig. 5 and Fig. 6. These figures illustrate that the FE model and the experimental data were good similar. It can be seen that the ratio of the numerical to experimental axial compressive strength (P Num . / P Exp ), maximum longitudinal displacement ( Δ Num / Δ Exp ) and lateral strain ( ε Exp / ε Num ) ranges between (0.91-0.97), (0.98-1.03) and (1.01-1.10) respectively. Figs. 7 show the comparisons between numerical plastic strain and experimental mode of failure [43]. Also, Fig. 7 shows the experimental and numerical damage for verified specimens under concentric load. Tab. 9 summarized the numerical results.

Experimental values of the axial compressive strength (kN)

Numerical values of the axial compressive strength (kN)

Max. Experimental longitudinal displacement (mm)

Max. Numerical longitudinal displacement (mm)

Numerical Lateral strain (mm/mm)

P Num / P Exp

Δ Num / Δ Exp

Experimental Lateral strain (mm/mm)

ε Exp / ε Num

Group No.

Specimen ID

C1A0 C2B0 C3D0 C4E0

482 633 721 875

467.6 576.2 672.1 823.7

0.97 0.91 0.93 0.94

5.6

5.66 4.12 4.12 3.92

1.01 1.00 0.98 1.03

0.0011 0.00245 0.00353 0.00295

0.0010 0.0024 0.0035 0.0029

1.10 1.02 1.01 1.02

4.11

1

4.2

3.81

Table 8: Comparisons between numerical and experimental results [43].

196