5 CHAPTER 5: TORSION
Torsional cracking is assumed to occur when the principal tensile stress s1 reaches the tensile strength of concrete in biaxial tension-compression, taken as 1.06 fc′ , since the tensile strength under biaxial tension is less than that under uniaxial tension. Substituting this in Eq. (5.15), gives the cracking torque Tcr as ( ) cp cp 2 cr c p A
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