PSI - Issue 37

Jamal A. Abdalla et al. / Procedia Structural Integrity 37 (2022) 660–667 Abdalla et al./ Structural Integrity Procedia 00 (2019) 000 – 000

662

3

170

75

75

10

10

200

200

95

80

170 170

135 135

300

300

150 mm CFRP strip penetration

150 mm CFRP strip penetration

10

60

(a)

(b)

Fig. 1. Specimen strengthening (a) four strips; (b) eight strips.

3. Experimental Program and Results The experimental results obtained in this study are summarized in Table 2. It shows the ultimate attained axial load (P u ) with different load eccentricity ratios (0, 0.25, 0.50, 0.75), NSM CFRP strips and number of CFRP wraps (0, 2, 4, 8). T he corresponding ultimate axial deformation (δ u ), axial deformation at failure (δ f ), ultimate lateral deflection (Δ u ),and lateral deflect ion at failure (Δ f ), among other experimental data are provided in the published experimental paper by the authors (Abokwiek et al. 2021). Several ductility indices were calculated based on these experimental measurements. The unstrengthened specimens in each subgroup were used as control specimens for their subgroup and each has been used as a benchmark to measure the performance of other specimens within or outside the subgroup. It is observed that concrete confinement with CFRP wraps increases the axial load capacity of the specimens when the load is concentrically applied. In addition, confinement with CFRP wraps and the use of CFRP strips increases the flexural capacity of the specimens, however, the increase in eccentricity ratio decreases the flexural capacity.

Table 2 Experimentally measured axial load capacity (Abokwiek et al. 2021) P Exp (kN) Eccentricity Ratio e x / b x =0.0 e x / b x =0.25

e x / b x =0.50 P 0.50 (kN)

e x / b x =0.75 P 0.75 (kN)

P 0.0 (kN)

P 0.25 (kN)

No. of CFRP strips and wraps

0S0W (no Strip, no Wrap) 4S2W (4 Strips, 2 Wraps) 4S4W (4 Strips, 4 Wraps) 4S8W (4 Strips, 8 Wraps)

1117

546

272

182

1520

902

474

290

1667

891

423

316

-

808

531

348