Research Article
Behavior of Reinforced Composite Foamed-Normal Concrete Beams
Table 7
Stiffness value of investigated beams.
| | Beam symbol | P crack (kN) | Δcrack (mm) | Initial stiffness (kN/mm) | Increase (%) | Decrease (%) | Service stiffness (kN/mm) | Increase (%) | Decrease (%) |
| | Nρ1 | 20 | 0.74 | 27 | — | — | 16.83 | — | — | | Fρ1 | 19 | 0.83 | 23.2 | — | 14 | 15.38 | — | 9.2 | | Cρ1 | 18 | 0.67 | 26.8 | — | 0.7 | 17.7 | 5.16 | — | | Nρ2 | 25 | 0.82 | 30.48 | — | — | 25.2 | — | — | | Fρ2 | 20 | 0.94 | 21.27 | — | 29 | 20.3 | — | 19.4 | | Cρ2 | 20 | 0.5 | 40 | 31.2 | — | 23.57 | — | 6.46 | | Nρ3 | 30 | 0.62 | 48 | — | — | 28.5 | — | — | | Fρ3 | 22 | 0.8 | 27.5 | — | 42 | 22.5 | — | 21 | | Cρ3 | 25 | 0.78 | 32 | — | 33 | 24.57 | — | 13.78 |
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