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4.5.9.3 - In case floor slabs are modeled as rigid diaphragms in their own planes according to 4.5.6.4 , the storey masses are defined in such a way that they correspond to three independent rigid movement degrees in plane at the main node in the center of mass. Independent degrees of freedom are usually chosen as two horizontal translational degrees of freedom and rotational degrees of freedom around the vertical axis passing through the main node. Equation (4.16) shall be taken as basis in the calculation of the floor masses . Masses corresponding to the vertical degrees of freedom in the slab shall be defined as in 4.5.9.2 .
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