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PROBLEM 5.75
Determine (a) the distance a so that the reaction at support B is
minimum, (b) the corresponding reactions at the supports.
PROBLEM 5.76
Determine the reactions at the beam supports for the given
loading when w
O
400 lb/ft.
PROBLEM 5.77
Determine (a) the distributed load w
O
at the end A of the beam
ABC for which the reaction at C is zero, (b) the corresponding
reaction at B.
PROBLEM 5.78
The beam AB supports two concentrated loads and rests on soil that
exerts a linearly distributed upward load as shown. Determine the
values of
A
and
B
corresponding to equilibrium.
PROBLEM 5.79
For the beam and loading of Problem 5.78, determine (a) the
distance a for which
A
20 kN/m, (b) the corresponding value of
B
.
PROBLEM 5.78
The beam AB supports two concentrated loads
and rests on soil that exerts a linearly distributed upward load as
shown. Determine the values of
A
and
B
corresponding to
equilibrium.
PROBLEM 5.80
The cross section of a concrete dam is as shown. For a 1-ft-wide
dam section determine (a) the resultant of the reaction forces exerted
by the ground on the base AB of the dam, (b) the point of application
of the resultant of part a, (c) the resultant of the pressure forces
exerted by the water on the face BC of the dam.
PROBLEM 5.81
The cross section of a concrete dam is as shown. For a 1-m-wide
dam section, determine (a) the resultant of the reaction forces
exerted by the ground on the base AB of the dam, (b) the point of
application of the resultant of part a, (c) the resultant of the pressure
forces exerted by the water on the face BC of the dam.
PROBLEM 5.81 (Continued)
1(1.5 m) 0.75 m
x
PROBLEM 5.82
The dam for a lake is designed to withstand the additional force caused by
silt that has settled on the lake bottom. Assuming that silt is equivalent to
a liquid of density
33
1.76 10 kg/m
s
and considering a 1-m-wide
section of dam, determine the percentage increase in the force acting on
the dam face for a silt accumulation of depth 2 m.
