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1.0
3.0
2.5
0.8
I
t
t
3
bt
/
3
b
0.6
2.0
t
,
max
1.5
0.4
/(
2
T
t
bt
/
3
1.0
0.2
0
0.5
0
2
4
6
8
10
Width-thickness ratio
b/t
Figure 10.9
Torsion properties of rectangular sections.
t
,
max
t
t
,
max
Constant shear
flow
t
t
t
t
y
y
C
C
z
z
(a) Open section
(b) Closed section
Figure 10.10
Shear stresses due to uniform torsion of thin-walled sections.
similarity, the torsion section constant
I
t
can be closely approximated by
bt
3
/
3,
I
t
≈
(10.17)
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