6.70 through 6.74 classify as determinate or indeterminate. (All members act both in tension and in compression.)
Fig. P6.73
Structure (a):
Rigid truss with r = 3, m = 14, n = 8,
so r + m = 17 > 2n = 16
so completely constrained but indeterminate
Structure (b): Simple truss (start with ABC and add joints alphabetically), with
r = 3, m = 13, n = 8, so r + m = 16 = 2n
so completely constrained and determinate
Structure (c):
Simple truss with r = 3, m = 13, n = 8, so r + m = 16 = 2n, hut horizontal reactions (Ax and Dx) are collinear, so cannot he resolved by any equilibrium equation.
Structure is improperly constrained.
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