Civil Engineering Reference
In-Depth Information
15 mm
2mm
25 mm
25 mm
15 mm
25 mm
20 mm
F
IGURE
P.11.8
P.11.9
The thin-walled angle section shown in Fig. P.11.9 supports shear loads that
produce both shear and torsional effects. Determine the maximum shear stress in the
cross section of the angle, stating clearly the point at which it acts.
Ans.
18.0N/mm
2
on the inside of flange BC at 16
.
5mm from point B.
C
2.0 mm
60 mm
2.5 mm
500 N
A
B
2mm
1000 N
1mm
80 mm
F
IGURE
P.11.9
P.11.10
Figure P.11.10 shows the cross section of a thin-walled inwardly lipped channel.
The lips are of constant thickness while the flanges increase linearly in thickness from
1
.
27mm, where they meet the lips, to 2.54mm at their junctions with the web. The
web has a constant thickness of 2.54mm and the shear modulus
G
is 26 700N/mm
2
.
Calculate the maximum shear stress in the section and also its rate of twist if it is
subjected to a torque of 100Nm.
297
.
4N/mm
2
,d
θ
/d
x
Ans.
τ
max
=±
=
0
.
0044 rad/mm.
38 mm
50 mm
2.54 mm
1.27 mm
50 mm
50 mm
F
IGURE
P.11.10
