Question: 3. For the 3-bar truss below use (a) unit dummy-displacement method, and (b) Castigliano's I theorem to find the displacement at D. Assume that

3. For the 3-bar truss below use (a) unit dummy-displacement method, and (b) Castigliano's I theorem to find the displacement at D. Assume that the axial stiffness of all the bars to be same denoted by k. A B 4 1 2 3 (3) 4 L L = 5L/4 3 L = L PD up L3 = 5L/3 VD

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