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In the pinned truss shown in Figure, pin 3 is fixed. The pin at 1 is free to move in a vertical guide, and the pin at 2 can only move along the horizontal guide. If a force P is applied at pin 2 as shown, determine U2 and V1 in terms of P. Calculate all

247_horizontal guide.jpg

reaction forces at pins 1, 2, and 3, and check to see whether equilibrium is satisfied. Formulate the stiffness matrix with factor EA/l by the finite element method.

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