1. For the rigid frame shown in Figure P5–20, determine (1)
the nodal displacement components and (2) the support reactions. (3) Draw the
shear force and bending moment diagrams. Let E = 30
10
6
psi, I = 200 in.
4
, and A = 10 in.
2
for all elements,
except as noted in the figure.
2. For the slant-legged rigid frame shown in Figure P5–21,
size the structure for minimum weight based on a maximum bending stress of 20
ksi in the horizontal beam elements and a maximum compressive stress (due to
bending and direct axial load) of 15 ksi in the slant-legged elements. Use the
same element size for the two slant-legged elements and the same element size
for the two 10-foot sections of the horizontal element. Assume A36 steel is
used.
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