Table 4 Results of the tested beams
Groups | (1) | (2) | (3) | ||||||
|---|---|---|---|---|---|---|---|---|---|
Beam Number | B1 | B2 | B3 | B4 | B5 | B6 | B7 | B8 | B9 |
Bar diameter (mm) | 10 | 10 | 10 | ||||||
Type | SCC | SCC | NVC | ||||||
fck, cube (N/mm2) | 35 | 65 | 35 | ||||||
Cover (mm) | 30 | 50 | 30 | 30 | |||||
Lap splice length as percentage of anchorage length according to ECP 203-2018 Code & of Design & Construction of Reinforced Concrete Structures, xxxx | 25% Ld | 50% Ld | 100% Ld | No splice | 25% Ld | 25% Ld | 50% Ld | 25% Ld | 50% Ld |
Lap splice length (mm) | 185 | 365 | 730 | – | 185 | 140 | 280 | 185 | 365 |
Confinement | ɸ 10@50 mm | ||||||||
Cracking load, P, kN | 30 | 35 | 40 | 40 | 20 | 40 | 45 | 30 | 35 |
Ultimate load, P, kN | 110 | 125 | 150 | 172 | 65 | 135 | 160 | 80 | 115 |
Maximum deflection, Δmax, mm, at D.G (1) (see Fig. 4) | 4.00 | 5.40 | 9.20 | 7 | 2.10 | 5.80 | 6.70 | 4.00 | 5.41 |
Ultimate strains, εult (10–3) at Location 1 (see Fig. 2), E = 203,000 N/mm2 | 2.44 | 2.72 | 2.93 | 2.93 | 2.11 | 2.93 | 2.93 | 2.13 | 2.45 |
fult, N/mm2, calculated from the maximum load at ultimate strains, εult, at Location 1, (see Figs. 2, 9, 11, 17, 23) | 495 | 552 | 595 | – | 428 | 595 | 595 | 432 | 497 |
u, Mean bond stress, N/mm2, (ACI-318) (American Concrete Institute, 2019) | 6.70 | 3.78 | 2.04 | – | 5.78 | 10.60 | 5.31 | 5.84 | 3.40 |
Failure mode | Bond | Flexure | Bond | Bond | Bond | ||||