Assessing the Instantaneous Stiffness of Cracked Reinforced Concrete Beams Based on a Gradual Change in Strain Distributions

Table 3

Distances of the selected key sections to the left support of the beam B1 (unit: m).

Number	1st stage		2nd stage
	South side	North side	South side	North side
1	0.759	0.683	0.763	0.516
2	0.959	0.883	0.963	0.716
3	1.079	1.003	1.083	0.836
4	1.159	1.083	1.163	0.916
5	1.296	1.163	1.233	0.996
6	1.376	1.222	1.302	1.016
7	1.525	1.302	1.382	1.096
8	1.605	1.382	1.535	1.176
9	1.683	1.432	1.615	1.235
10	1.761	1.512	1.768	1.315
11	1.841	1.592	1.848	1.395
12	1.924	1.628	1.935	1.447
13	2.004	1.708	2.015	1.527
14	2.148	1.788	2.086	1.607
15	2.228	1.930	2.157	1.653
16	2.348	2.010	2.237	1.733
17	2.548	2.081	2.357	1.799
18	—	2.151	2.557	1.865
19	—	2.231	—	2.017
20	—	2.348	—	2.165
21	—	2.551	—	2.245
22	—	—	—	2.326
23	—	—	—	2.406
24	—	—	—	2.486
25	—	—	—	2.606
26	—	—	—	2.806