...
Thickness [in]: Enter the thickness value used to calculate the weight of the intermediate diaphragm. Stiffness of the created finite elements do is not affected by this input. During construction of diaphragms, the user can decide between including whether to include the diaphragm weight as a load and ignoring the diaphragms' or to ignore the diaphragm load effects to in the model.
Material: Set the material for the intermediate diaphragm. It is possible to consider the weight of the intermediate diaphragm and apply it as loads in stage construction analysis.
...