For unprotected I‑sections, the standard provides the correction factor ksh according to Equation 4.26a in Section 4.2.5.1 (2) to consider the shadowing effect. The term [Am/V]b is used there. This section factor includes Am, which represents the box enclosing the cross‑section (Index b = boxed). In the case of a three-sided fire exposure (a girder with a massive ceiling), the flange surface not exposed to fire is not taken into account when determining [Am/V]b.
RF-/TOWER load was extended with force coefficients for rounded profiles of four-sided towers and square-edged profiles of three-sided towers. The force coefficients for rounded profiles are determined using the Reynolds number. Previously, you could only use the rounded profiles for four‑sided towers and the square‑edged profiles for three‑sided towers.