Flexibility calculations using EN-13480
EN-13480 uses the hot modulus of elasticity in the flexibility calculations (Sect 12.1.7.2). The expansion allowable stress is subsequently modified by the ratio of Eh/Ec.
Calculate the flexibility stresses using EN-13480
EN-13480 provides two methods of determining the flexibility stresses. The CAESAR II default implementation is to use Sections 12.3.2 through 12.3.6, which perform an SRSS of the bending moments with a single SIF. As an alternative, the flexibility stresses can be determined by distinguishing between in and out of plane bending, using distinct SIFs, as discussed in Section 12.3.1. The option to implement this alternative can be found on the "SIF & Stress" tab of the configuration module.
EN-13480 pressure stiffening
EN-13480 does not consider pressure stiffening effects on bends.
EN-13480 creep
For more information, see Creep Loading