CEN 202- Quiz #1 -BProblem 1. (65 points) A simply supported truss is shown in the figure below. Assume that members EF and CF are subjected to the highest compressive and tensile forces when the load P is being applied. If the cross sectional area of all members is 2 in2, and the allowable axial compressive stress is 2000psi and the allowable axial tensile stress is 3000psi, calculate: (a) The maximum force that could be applied First of all I have to express FEFand ECFin terms of P 3455CFxCFCFyCFFFFF==From Joint F: E.O.E : 450054CFyCFCFFyFPFPFPΣ=⇒−=⇒=⇒=Tension 3533005454CFxEFCFEFEFEFFxFFFFPFFPΣ=⇒+=⇒ −=⇒ −== −Compression Now I can calculate the stresses: 5543000480028CFCFCFCFallowTensionPFPPlbAσσσσ=⇒=⇒===⇒=P
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