Purpose: Used to specify section properties of girder for preliminary analysis in Girder System Design Projects. (Not applicable to Line Girder Projects.)
--> Given in girder system input
Uniform flexural moment of inertia (in4 or mm4) for bracing to be used if bracing has not been defined by types and shapes. Can be used if all bracing has the same lx (Also see IXB-i ) (Default is 1000 in4 or 4.16 x 10^8 mm4, unless specified by IXBR or IXB-i )