Purpose: Used to define internal diaphragms at supports of box girders.
--> Given in girder input
Indicates there is a bearing at the center of the bottom flange of a box girder. The condition SINGLE BEARING STIFFENERS EACH SIDE in this situation indicates there is one stiffener on each side of the internal diaphragm, while the condition DOUBLE BEARING STIFFENERS EACH SIDE indicates there are two stiffeners on each side of the internal diaphragm. (Also see NBSTIFF )