D E 16 36 6 6 panels e 24'= 144 P12.40
(a) Load is applied to the three-hinged trussed
arch in Figure P12.40 through the upper chord panel
points by a floor beam and stringer floor system. Draw
the influence lines for the horizontal and vertical reac-
tions at support A and the forces or components of force
in members BC, CM, and ML. (b) Assuming that the dead
load of the arch and floor system can be represented by a
uniform load of 4.8 kips/ft, determine the forces in bars
CM and ML produced by the dead load. (c) If the live load
is represented by a uniformly distributed load of 0.8 kip/ft
of variable length and a concentrated load of 20 kips,
determine the maximum force in bar CM produced by the
live load. Consider both tension and compression. Joint
E acts as a hinge.
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