5. Figure below shows that the members of the truss have a cross-section area of 2.3 in² and Young's modulus E=107 psi.

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5 Figure Below Shows That The Members Of The Truss Have A Cross Section Area Of 2 3 In And Young S Modulus E 107 Psi 1 (119.98 KiB) Viewed 38 times

5. Figure below shows that the members of the truss have a cross-section area of 2.3 in² and Young's modulus E=107 psi. When FEA approach is used to determine the deflection of each joint (numbered in red color 1, 2, 3), then the local stiffness matrix of element 2 (numbered in black color 2) in the figure will be Y 0.25 0.433 -0.25 -0.433 -0.433 -0.75 0.433 0.75 X A) -0.25 -0.433 0.25 0.433 200 lb -0.433 -0.75 0.433 0.75 0.25 -0.433 -0.25 0.433 -0.75 -0.433 0.75 0.433 -0.25 0.433 0.25 -0.433 0.433 -0.75 -0.433 0.75 0.25 -0.433 -0.25 0.433 -0.433 -0.75 0.433 -0.75 -0.25 0.433 -0.25 0.433 0.433 -0.75 0.433 0.75 2 1 -0.25 0.433 -0.25 0.433 0.433 0.75 0.433 -0.75 -0.25 0.433 -0.25 -0.433 k 0.433 -0.75 -0.433 0.75 60° B) D) k k