Question: An air - conditioning unit weighing 1 2 0 0 N is bolted in the middle of two parallel simplysupported steel beams in Figure below.

An air-conditioning unit weighing 1200 N is bolted in the middle of two parallel simplysupported steel beams in Figure below. The clear span of the beams is 8 m. The second momentof the cross-sectional area of each beam is 100 cm4. The motor produces a vertical force of 60kN. Neglect the weight of the beams and assume 1% viscous damping in the system; for steelE =210 GPa. Plot the total deflection, velocity, and acceleration of the beams at their midpoints.And plot the phase portrait.

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