8-47 The upside-down steel A frame shown in the figure is to be bolted to steel beams on the ceiling of a machine room u

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8 47 The Upside Down Steel A Frame Shown In The Figure Is To Be Bolted To Steel Beams On The Ceiling Of A Machine Room U 1 (163.33 KiB) Viewed 28 times

8-47 The upside-down steel A frame shown in the figure is to be bolted to steel beams on the ceiling of a machine room using ISO grade 8.8 bolts. This frame is to support the 40-kN vertical load as illustrated. The total bolt grip is 48 mm, which includes the thickness of the steel beam, the A-frame feet, and the steel washers used. The bolts are size M20 x 2.5. (a) What tightening torque should be used if the connection is permanent and the fasteners are lubricated? T-476 N-m (b) Determine the factors of safety guarding against yielding, overload, and joint separation. n₂-1.07, n-3.22, no-8.57 Problem 8-47 Drill 2 holes for M20 x 2.5 bolts W = 40 kN