4.5.2.1 - Beams and columns shall be modeled as frame (bar) finite elements . All 6 degrees of freedom will be taken into account at the joints of columns and beams. If slabs are modeled as rigid diaphragms, those that correspond to rigid movement of these degrees of freedom will be removed.

4.5.2.2 - The effective section stiffness of reinforced concrete columns and beams will be determined according to 4.5.8 .