Seismic design rules (Beams: AISC 360)

Additional design rules are required for seismic combinations. These are as per the AISC Seismic Provisions (AISC 341) (Ref. 5). These additional design rules ONLY apply to members in Seismic Load Resisting Systems.

The rules applied depend upon the seismic load resisting system as defined in the AISC Seismic Provisions and are listed below:

For a moment resisting frame

9. Special Moment Frame (SMF)

9.4a. Classification
9.8. Max spacing of bracing

10. Intermediate Moment Frame (IMF)

10.4a. Classification
10.8. Max spacing of bracing

11. Ordinary Moment Frame (OMF)

11.4. Classification

Moment resisting frame with a truss component

12. Special Truss Moment Frame (STMF) 1- Beyond Scope

For a braced frame

13. Special Concentrically Braced Frames (SCBF)

13.2d. Classification
13.4a.(2). Max lat brace spacing
13.4a. V and inverted V type

14. Ordinary Concentrically Braced Frames (OCBF)

14.2. Classification
14.3. Beams with V and inverted V type
Beams (not columns with no K braces)
- 14.2.(2). Max lat brace spacing

15. Eccentrically Braced Frames (EBF) - Beyond Scope

Buckling resistant braced frame

16. Buckling Restrained Braced Frames (BRBF) - Beyond Scope

Frames containing composite beams

Composite Special Concentrically Braced Frames (C-SCBF) - Beyond Scope
Composite Ordinary Braced Frames (C-OBF) - Beyond Scope
Composite Eccentrically Braced Frames (C-EBF) - Beyond Scope