In Seismic Provision mode the structure is checked in accordance with the detailing and design requirements of a selected seismic code. The checks performed in this mode rely heavily on the load combinations and design criteria established in the Standard Provision Mode. Note that only the AISC 05 - LRFD post processor will be used in this tutorial although the AISC-02, AISC - 97 and UBC - 97 codes work in a similar manner.

The Seismic Provision Mode is only accessible if one of the AISC Steel Design codes (ASD or LRFD) is used in Standard Provision Mode. There must also be at least one seismic load case defined. If your model is based on the British code or if you do not have a license of the Special Seismic provisions module, skip this entire section.

To switch to the Steel - Seismic Provision mode:

• Select Mode > Steel > Seismic Provisions.
  
• In the Special Seismic Provision Codes dialog box that opens, select the button for AISC 05 > LRFD.
• Under Options, Check all checkboxes.
• Type 1.1 for the Cpr Factor and 4 for the EBF Cd Factor.

Note that you are not able to change to the AISC-05 ASD or the UBC 97 - ASD code because this requires that an AISC - ASD Steel Design Code be selected in Standard Provision mode prior to entering the seismic mode.

This dialog can be displayed any time while in Seismic Provision mode by selecting the Criteria - Codes menu item.

• Click [OK].
  

In the Seismic Provisions Load Combinations dialog box that opens

• Set the Live Load factor to 0.5
• Set the Sds value to 1.113
• Set Omega to 3.
• Click [Generate].
• Click [OK].

Additional Customized Load Combinations can be defined and selected in the same way that they are in Standard Provision mode.