Civil Engineering Reference
In-Depth Information
P.10.12
An overhead crane runs on tracks supported by a thin-walled beam whose
closed cross section has the shape of an isosceles triangle (Fig. P.10.12). If the walls
of the section are of constant thickness throughout determine the position of its shear
centre.
Ans.
0.7m from horizontal wall.
2m
h
E
S
3m
F
IGURE
P.10.12
P.10.13
A box girder has the singly symmetrical trapezoidal cross section shown in
Fig. P.10.13. It supports a vertical shear load of 500 kN applied through its shear
centre and in a direction perpendicular to its parallel sides. Calculate the shear flow
distribution and the maximum shear stress in the section.
Ans. q
OA
=
0
.
25
s
A
10
−
4
s
B
+
q
AB
=
0
.
21
s
B
−
2
.
14
×
250
q
BC
=−
0
.
17
s
C
+
246
30
.
2N
/
mm
2
.
τ
max
=
500 kN
s
C
8mm
C
D
B
10 mm
10 mm
120
°
120
°
12 mm
1m
s
B
O
s
A
E
A
2m
F
IGURE
P.10.13
