The stair tread of the escalator is supported on two of its sides by the moving pin at \(A\) and the roller at \(B\). If a man having a weight of \(300 \mathrm{lb}\) stands in the center of the tread, determine the principal stresses developed on the cross section at point \(C\). The stairs move at constant velocity.

Transcribed Image Text:

1.25 ft- 30 Lch5 ft 30 0.5 ft B 0.5 ft 1 in. CH 2 in. 0.5 in.