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In case the structural system elements are modeled as a beam, 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.
A structure's effective seismic weight, W, includes dead and live loads. In the story settings, LLR factor should be given by users.
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