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PART 1: FRAMES AND MACHINES
Question 1: Frames and machines are composed of multi-force members connected together in a structural system. The primary difference between frames and machines is that machines have moving parts:
The following figure applies to Questions 2, 3 and 4 (overleaf).
The structure is a knee-braced portal frame, similar to those found in industrial warehouses. The rafter of the portal frame (CDEFG) is subject to an uplift wind load, idealised here as a uniform distributed load. A piece of heavy equipment is suspended from the rafter at E. The supports at A and I are pins. The joints C and G are smooth pins. The members BD and HF are connected to the portal frame with smooth pins at both ends.
Question 2: Find the vertical reaction,