Page 225 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

Brockenbrough_Ch05.qxd 9/29/05 5:12 PM Page 5.5

CRITERIA FOR BUILDING DESIGN

CRITERIA FOR BUILDING DESIGN 5.5

TABLE 5.1 Limiting Width–Thickness Ratios for Compression Elements (Continued)
Limiting width–thickness ratios
Width–
thickness λ ρ λ r
Case Description of element ratio (compact) (noncompact) Example
Unstiffened elements

.
/
.
7 Flexure in flanges of tees b/t 038 EF y 10 EF y
/

8 Uniform compression in b/t NA 075 EF y
/
.
stems of tees

Stiffened elements
/
/
9 Flexure in webs of doubly h/t w 376 EF y 570 EF y
.
.
symmetric I-shaped
sections and channels

.
/
10 Uniform compression in h/t w NA 149 EF y
webs of doubly symmetric
I-shaped sections

.
11 Flexure in webs of h c /t w h c E 570 EF y
/
h p F y
singly symmetric I-shaped 2 ≤λ r
sections ( 0 54 M p − 0 089 )
.
.
M y
/
12 Uniform compression in b/t 112 EF y 140 EF y
/
.
.
flanges of rectangular box
and hollow structural
sections of uniform
thickness subject to bending
or compression; flange cover
plates and diaphragm plates
between lines of fasteners
or welds
(Continued)

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