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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

Columnf′c (MPa)fr (MPa)fcr (MPa)fr/f′cfcr/f′cf′cc/f′c
S333.80.61.830.01780.0541.20
S431.60.641.830.020.0581.24