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P17.092 Incorrect Compute the vertical displacement Δο of joint D for the truss in the figure. Assume that each member has a cross sectional area of A 15s in 2 and an elastic modul ofE-30 500 ksi The loads acting on the truss are P 18 kips and Q 31 kips. Employ Castiglianos second theorem. The vertical displacement Δο is positive if upward and negative if downward. Assume that a-23 ft, b = 10ft,and c = 23 ft. よ L. C y 4l 0.4604 Answer: ΔD= the tolerance is +/-2%

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