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Problem 2.7-6 The truss ABC shown in the figure is subjected to a horizontal load P at joint B . The two bars are identical with cross- sectional area A and modulus of elasticity E . (a) Determine the strain energy U of the truss if the angle 60°. (b) Determine the horizontal displacement B of joint B by equating the strain energy of the truss to the work done by the load. Solution 2.7-6 Truss subjected to a load P SECTION 2.7 Strain Energy 141 P B C A L 60 L AB L BC L cos 1/2 F REE - BODY DIAGRAM OF JOINT B © F vert 0 F AB sin F BC sin 0 F AB
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