From: Flexural Behavior of Circular Hollow RC Piers with Reduced Amounts of Inner Hoops
Column
f′c (MPa)
fr (MPa)
fcr (MPa)
fr/f′c
fcr/f′c
f′cc/f′c
S3
33.8
0.6
1.83
0.0178
0.054
1.20
S4
31.6
0.64
0.02
0.058
1.24