Substructure groups commonly used data together in the form of libraries. Libraries are used to store data that does not change often and is to be used repeatedly across projects. The three library types available in Substructure are:

• Vehicular Loads
• Load Groups/Limit States
• Footing Configuration

All libraries store information as suggested by their titles.

Substructure is released with a set of default libraries namely Lrfdtrk.rp1 (vehicular loads - LRFD), stdtrk.rp1 (vehicular loads - LFD), Lrfdload.rp2 (Load Groups/Limit States - LRFD), stdload.rp2 (Load Groups/Limit States - LFD), RebarLib.rlb. and default.rp3 (footing). Most items in these files rather than creating and setting up different /multiple library files.

To select a specific library file to be used as default, click the Setup option from the Libraries menu. See Libraries | Setup.