7. All members of the truss shown in the figure initially have a circular cross-section with diame¬

ter of 2 in. Using one of the finite element analysis programs in Appendix, calculate the mini¬

mum diameter of each member using fully stressed design. Assume that Young's modulus E == 104psi, yield stress ay = 500psi, and safety factor SF = 1.5. For the zero-force member, use the smallest diameter of d = 0.1 in.

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