A beam supported by a pin, a spring of stiffness k, and a roller at points 1, 2, and 3, respectively, is under a concentrated load P at point 2 (Fig. P7.28). Calculate (a) the nodal displacements; (b) the nodal forces and spring force. Given: L= 4 m, P = 12 kN, EI = 14 MN m2, and k = 200 kN/m.
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