FChapter F Design of members for flexure
PDF page 118 · AISC 360-22
This chapter applies to members subjected to simple bending about one principal axis. For simple bending, the member is loaded in a plane parallel to a principal axis that passes through the shear center or is restrained against twisting at load points and supports.
The chapter is organized as follows:
- F1. General Provisions
- F2. Doubly Symmetric Compact I-Shaped Members and Channels Bent About Their Major Axis
- F3. Doubly Symmetric I-Shaped Members with Compact Webs and Noncompact or Slender Flanges Bent About Their Major Axis
- F4. Other I-Shaped Members with Compact or Noncompact Webs Bent About Their Major Axis
- F5. Doubly Symmetric and Singly Symmetric I-Shaped Members with Slender Webs Bent About Their Major Axis
- F6. I-Shaped Members and Channels Bent About Their Minor Axis
- F7. Square and Rectangular HSS and Box Sections
- F8. Round HSS
- F9. Tees and Double Angles Loaded in the Plane of Symmetry
- F10. Single Angles
- F11. Rectangular Bars and Rounds
- F12. Unsymmetrical Shapes
- F13. Proportions of Beams and Girders
User Note: For cases not included in this chapter, the following sections apply:
- • Chapter G Design provisions for shear
- • H1–H3 Members subjected to biaxial flexure or to combined flexure and axial force
- • H3 Members subjected to flexure and torsion
- • Appendix 3 Members subjected to fatigue
For guidance in determining the appropriate sections of this chapter to apply, Table User Note F1.1 may be used.
TABLE USER NOTE F1.1 Selection Table for the Application of Chapter F Sections
| Section in Chapter F | Cross Section | Flange Slenderness | Web Slenderness | Limit States |
|---|---|---|---|---|
| F2 | C | C | Y, LTB | |
| F3 | NC, S | C | LTB, FLB | |
| F4 | C, NC, S | C, NC | CFY, LTB, FLB, TFY | |
| F5 | C, NC, S | S | CFY, LTB, FLB, TFY | |
| F6 | C, NC, S | NA | Y, FLB | |
| F7 | C, NC, S | C, NC, S | Y, FLB, WLB, LTB | |
| F8 | NA | NA | Y, LB | |
| F9 | C, NC, S | NA | Y, LTB, FLB, WLB | |
| F10 | NA | NA | Y, LTB, LLB | |
| F11 | NA | NA | Y, LTB | |
| F12 | Unsymmetrical shapes, other than single angles | NA | NA | All limit states |
C = compact; CFY = compression flange yielding; FLB = flange local buckling; LB = local buckling; LLB = leg local buckling; LTB = lateral-torsional buckling; NC = noncompact; S = slender; TFY = tension flange yielding; WLB = web local buckling; Y = yielding; NA = not applicable
Specification for Structural Steel Buildings, August 1, 2022
AMERICAN INSTITUTE OF STEEL CONSTRUCTION