1. Derive Eq. (3.7.21) for stress in space truss elements by a process similar to that used to…


1. Resolve Eq. (3.7.21) for force in room truss parts by a regularity concordant to that used to resolve Eq. (3.5.6) for force in a plane truss part.

2. For the truss shown in Figure P3–46, use harmony to determine the displacements of the nodes and the forcees in each part. All elements accept E = 30 106 psi. Elements 1, 2, 4, and 5 accept A = 10 in2 and part 3 has A = 20 in2.