Assessing the Instantaneous Stiffness of Cracked Reinforced Concrete Beams Based on a Gradual Change in Strain Distributions
Table 4
Calculated and experimental stiffness of the test beams (unit: kN/mm).
Test beams
1st stage
2nd stage
Kexp
Kcal1
Kcal2
Kcal1/Kexp
Kcal2/Kexp
Kexp
Kcal1
Kcal2
Kcal1/Kexp
Kcal2/Kexp
B1
40.79
43.80
40.69
1.07
1.00
31.43
31.20
33.39
0.99
1.06
B2
43.05
41.94
42.02
0.97
0.98
31.00
29.63
32.74
0.96
1.06
B3
29.01
30.85
30.01
1.06
1.03
23.57
23.49
22.14
1.00
0.94
B5
38.01
35.79
33.61
0.94
0.88
31.22
31.56
31.22
1.01
1.00
B6
36.50
33.83
31.50
0.93
0.86
23.17
23.85
24.80
1.03
1.07
Kexp denotes the experimental stiffness, Kcal1 is the beam stiffness calculated by the proposed method, and Kcal2 denotes the beam stiffness calculated by Xu et al. [10].
