Section 8.2.2
Determining Applicable Flexural Limit States
Last Revised:
06/16/2011
The selection of the appropriate limit states, in the appropriate form, can
be a bit confusing in the 13th edition of the SCM. To help the
process, Table User Note F1.1 has been provided (see SCM page 16.1-45).
This table, however, does not preclude reading of the criteria statements the
beginning of each section of chapter F. It has been found that
beginning students are often times confused when selecting the appropriate SCM
criteria. To aid the beginning student, additional tables are provided here as
another view of the selection for I shaped members.
The choice of Chapter F section depends on the shape of the section and the
slenderness of the cross sectional plate elements. While the sections
address many of the same limit states, they do so slightly different in each
case. The following tables may help to select the correct limit states in
the correct sections.
Table 8.2.2.1
Limit States and Applicable Chapter F Sections
For Doubly Symmetric I-Shapes (W, M, S, HP and built-up Sections)
Bent About Their Major Axis
Flange |
Web |
Limit State |
Y |
CFY |
LTB |
FLB |
TFY |
Compact |
Compact |
F2.1 |
---- |
F2.2 |
---- |
---- |
Compact |
Non-Compact |
---- |
F4.1 |
F4.2 |
F4.3a |
F4.4 |
Compact |
Slender |
---- |
F5.1 |
F5.2 |
F5.3a |
F5.4 |
Non-Compact |
Compact |
---- |
---- |
F3.1 |
F3.2a |
---- |
Non-Compact |
Non-Compact |
---- |
F4.1 |
F4.2 |
F4.3b |
F4.4 |
Non-Compact |
Slender |
---- |
F5.1 |
F5.2 |
F5.3b |
F5.4 |
Slender |
Compact |
---- |
---- |
F3.1 |
F3.2b |
---- |
Slender |
Non-Compact |
---- |
F4.1 |
F4.2 |
F4.3c |
F4.4 |
Slender |
Slender |
---- |
F5.1 |
F5.2 |
F5.3c |
F5.4 |
Table 8.2.2.2
Limit States and Applicable Chapter F Sections
For Singly Symmetric I-Shapes with Web Attached at Mid Flange
Bent About Their Major Axis
Flange |
Web |
Limit State |
CFY |
LTB |
FLB |
TFY |
Compact |
Compact |
F4.1 |
F4.2 |
F4.3a |
F4.4 |
Compact |
Non-Compact |
F4.1 |
F4.2 |
F4.3a |
F4.4 |
Compact |
Slender |
F5.1 |
F5.2 |
F5.3a |
F5.4 |
Non-Compact |
Compact |
F4.1 |
F4.2 |
F4.3b |
F4.4 |
Non-Compact |
Non-Compact |
F4.1 |
F4.2 |
F4.3b |
F4.4 |
Non-Compact |
Slender |
F5.1 |
F5.2 |
F5.3b |
F5.4 |
Slender |
Compact |
F4.1 |
F4.2 |
F4.3c |
F4.4 |
Slender |
Non-Compact |
F4.1 |
F4.2 |
F4.3c |
F4.4 |
Slender |
Slender |
F5.1 |
F5.2 |
F5.3c |
F5.4 |
Table 8.2.2.3
Limit States and Applicable Chapter F Sections
For Channels
Bent About Their Major Axis
Flange |
Web |
Limit State |
Y |
LTB |
Compact |
Compact |
F2.1 |
F2.2 |
Compact |
Non-Compact |
SCM Chapter F makes no provisions for these conditions. There
is some vague reference in F12 to using principles of mechanics to
determine the critical stresses. The goal is to keep the
actual stress below the critical stresses determined by principles
of mechanics. |
Compact |
Slender |
Non-Compact |
Compact |
Non-Compact |
Non-Compact |
Non-Compact |
Slender |
Slender |
Compact |
Slender |
Non-Compact |
Slender |
Slender |
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