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Table 4 The radial and circumferential confining stresses experienced by the confined concrete in columns S3 and S4.

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

1.83

0.02

0.058

1.24