Civil Engineering Reference
In-Depth Information
which gives
N
CD
=+
2 kN (tension)
From the completed normal force diagram in Fig. 3.10(d) we see that the maximum
normal force in the beam is 2 kN (tension) acting at all sections between C and D.
3.4 S
HEAR
F
ORCE AND
B
ENDING
M
OMENT
It is convenient to consider shear force and bending moment distributions in beams
simultaneously since, as we shall see in Section 3.5, they are directly related. Again the
method of construction of shear force and bendingmoment diagrams will be illustrated
by examples.
E
XAMPLE
3.4
Cantilever beamwith a concentrated load at the free end (Fig. 3.11).
W
W
M
AB
A
X
B
X
B
WL
S
AB
x
W
L
x
L
(a)
(b)
A
B
ve
Shear force
W
W
(c)
ve
Bending moment
A
B
(d)
A
F
IGURE
3.11
Shear
force and bending
moment diagrams
for the beam of
Ex. 3.4
W
B
(e)
