[ANSWERED] 1. Determine the displacements and reactions for the space frames shown in Figures P5–58 and P5–59..

1. Determine the displacements and reactions for the space
frames shown in Figures P5–58 and P5–59. Let I
x
= 100 in.
4
,
I
y
= 200 in.
4
, I
z
= 1000 in.
4
, E =
30,000 ksi, G = 10,000 ksi, and A = 100 in.
2
for both frames.
2.
Design a jib crane as shown in Figure P5–60 that
will support a downward load of 6000 lb. Choose a common structural steel shape
for all members. Use allowable stresses of 0:66Sy (S
y
is the yield
strength of the material) in bending, and 0:60S
y
in
tension on gross areas. The maximum deflection should not
exceed 1=360 of the length of the horizontal beam. Buckling should be checked
using Euler’s or Johnson’s method as applicable.