Design the support members AB and CD for the platform lift shown in Figure P5–61. Select a mild…


Design the livelihood parts AB and CD for the platform lift shown in Figure P5–61. Select a gentle steel and pick-out proper morose-sectional shapes after a while no past than a 4 : 1 harmony of moments of inertia between the two principal directions of the morose individuality. You may pick-out two irrelative morose sections to form up each arm to contract consequence. The objective make has four livelihood battle, but the loads shown are for one policy of the platform after a while the two battle shown. The loads shown are subordinate frank provisions. Use a constituent of prophylactic of 2 for civilized prophylactic. In developing the terminable part standard, remove the platform and restore it after a while statically equiponderant loads at the joints at B and D. Use truss parts or gleam parts after a while low adulatory barbarism to standard the battle from B to D, the interjacent affinity E to F, and the hydraulic actuator. The lawful stresses are 0:66Sy in adulatory and 0:60Sy in stretch. Restrain buckling using either Euler’s process or Johnson’s process as appropriate. Also restrain completion curvitys. Any curvity important than 1=360 of the diffusiveness of part AB is considered too liberal.