Civil Engineering Reference
In-Depth Information
y
A
5mm
20 mm
z
G
5mm
5mm
10 mm
F
IGURE
P.9.9
P.9.10
Abeampossessing the thick section shown inFig. P.9.10 is subjected to a bending
moment of 12 kNm applied in a plane inclined at 30
◦
to the left of vertical and in a
sense such that its components
M
z
and
M
y
are negative and positive, respectively.
Calculate the magnitude and position of the maximum direct stress in the beam cross
section.
Ans
. 156.2N/mm
2
(compression) at D.
150 mm
10 mm
B
A
H
J
10 mm
200 mm
F
E
10 mm
C
D
50 mm
F
IGURE
P.9.10
P.9.11
The cross section of a beam/floor slab arrangement is shown in Fig. P.9.11. The
complete section is simply supported over a span of 10m and, in addition to its self-
weight, carries a concentrated load of 25 kN acting vertically downwards at mid-span.
If the density of concrete is 2000 kg/m
3
, calculate the maximum direct stress at the
point A in its cross section.
Ans
. 5.4N/mm
2
(tension).
