Civil Engineering Reference
In-Depth Information
Table 8.1
Va l u e s o f
β
and
θ
for sections with transverse reinforcement (AASHTO Specifications,
2007)
v
u
f
c
Longitudinal strain,
ε
x
×
1000
≤−
0.20
≤−
0.10
≤−
0.05
≤
0
≤
0.125
≤
0.25
≤
0.50
≤
0.75
≤
1.00
≤
0
.
075
θ
22.3
20.4
21.0
21.8
24.3
26.6
30.5
33.7
36.4
β
6.32
4.75
4.10
3.75
3.24
2.94
2.59
2.38
2.23
≤
0
.
100
θ
18.1
20.4
21.4
22.5
24.9
27.1
30.8
34.0
36.7
β
3.79
3.38
3.24
3.14
2.91
2.75
2.50
2.32
2.18
≤
0
.
125
θ
19.9
21.9
22.8
23.7
25.9
27.9
31.4
34.4
37.0
β
3.18
2.99
2.94
2.87
2.74
2.62
2.42
2.26
2.13
≤
.
θ
0
150
21.6
23.3
24.2
25.0
26.9
28.8
32.1
34.9
37.3
β
2.88
2.79
2.78
2.72
2.60
2.52
2.36
2.21
2.08
≤
0
.
175
θ
23.2
24.7
25.5
26.2
28.8
29.7
32.7
35.2
36.8
β
2.73
2.66
2.65
2.60
2.52
2.44
2.28
2.14
1.96
≤
0
.
200
θ
24.7
26.1
26.7
27.4
29.0
30.6
32.8
34.5
36.1
β
2.63
2.59
2.52
2.51
2.43
2.37
2.14
1.94
1.79
≤
0
.
225
θ
26.1
27.3
27.9
28.5
30.0
30.8
32.3
34.0
35.7
β
2.53
2.45
2.42
2.40
2.34
2.14
1.86
1.73
1.64
≤
0
.
250
θ
27.5
28.6
29.1
29.7
30.6
31.3
32.8
34.3
35.7
β
2.39
2.39
2.33
2.33
2.12
1.93
1.70
1.58
1.50
Figure 8.9
General view of prestressed concrete I-beam tests
