# Mass Definition in Structural Modelling

**4.5.9.1 - In case the** structural system elements are modeled as rod, plate (membrane) or shell finite element, the *individual node* masses are assigned as the components of the distributed masses in the coverage areas of the connected finite elements. Singular masses at finite element nodes are defined to correspond to only two horizontal or additional vertical translation degrees of freedom.

**4.5.9.2 -** The singular mass *m *^{( }_{j }^{S)} acting on the typical finite element **joint **_{j will} be calculated by **Equation (4.16)** .

Here *w *_{G, j }^{(S)} and *w *_{Q, j }^{(S)} denote the resultant constant load and live load acting on the finite element node j. **Eq. (4.16)** , located in *the movable load mass participation coefficient* , *n* , **Table 4.3** 'are given. In industrial buildings, *n* = 1 will be taken for fixed equipment weights , but crane lifting loads will not be taken into account in the floor weights. 30% of snow loads will be taken into account in calculating the weight of the roof. The condition given in **6.1.3** regarding non-structural elements and fittings shall be taken into account.

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