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구조역하및 실험 Problem Solution Homework #6 7.1 Solution : From equilibrium, axial forces of the bars can be easily determined as Only the compressed bar 13 may suffer buckling when the weight W increases. Since bar 13 is connected with pin at both ends, its buckling load is When the axial force reaches the critical load, buckling occurs. That is 7.2 Solution : The equilibrium equation in terms of deflection is The general solution is Its first, second and third derivatives, respectively, are

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Boundary conditions: From the calculation, we get Plug into the previous equation,

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7.3 Solution : In this problem, we have By treating the simply support beam as an elastic spring, the effective elastic constant α can be found by the following procedure, The deflection at the midpoint of the simply support beam caused by a vertical concentrated force F at the mid span of the beam can be found from books on mechanics

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