Page 121 - Civil Engineering Formulas
P. 121
64 CHAPTER TWO
l 2
1
P P
a
R 1 l R 2
2 x
Shear
M 1 M 2
Moment
FIGURE 2.18 Two equal concentrated moving
loads.
Figure 2.19 shows the condition when two equal loads are equally distant on
opposite sides of the center of the beam. The moment is then equal under the
two loads.
If two moving loads are of unequal weight, the condition for maximum
moment is the maximum moment occurring under the heavier wheel when the
center of the beam bisects the distance between the resultant of the loads and
the heavier wheel. Figure 2.20 shows this position and the shear and moment
diagrams.
l l
2 2
P P
a a
R 1 = P 2 2 R 2 = P
Shear
Moment
FIGURE 2.19 Two equal moving loads equally
distant on opposite sides of the center.
