Modelling diaphragm action

[user]

How can I model slab diaphragm action in 3D building structures?

[seismosoft]

We are currently implementing the possibility of assigning nodal constraints in SeismoStruct. Whilst awaiting for such possibility to be available, you may use the truss elements to create a system of horizontal pinned crossed-braces that feature the same stiffness as the slab panel itself. For square panels this implies that the axial stiffness of each brace (EA/L) must be approximately equal to 35% the stiffness of the slab (1/(L^3/12EI+L/AG)).

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