The vertical and horizontal poles at the traffic-light assembly are erected first. Determine the additional force and moment reactions at the base O caused by the addition of the three 86-lb traffic signals B, C, and D. Report your answers as a force magnitude and a moment magnitude.

Question

Engineering

Amirah Shaw

4 July, 13:31

The vertical and horizontal poles at the traffic-light assembly are erected first. Determine the additional force and moment reactions at the base O caused by the addition of the three 86-lb traffic signals B, C, and D. Report your answers as a force magnitude and a moment magnitude.

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Answers (1)

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Lorelei Moran · Answer 1

1. Az=258 lb

2. My=3440 ft lb

3. ∑Mz = 0

Explanation:

∑ Fx = Ax=0

∑ Fy = Ay=0

∑ Fz = Az-86-86-86

Az=258 lb

∑Mx=86 X 31 + Mx=0

Mx=2666 ft lb

∑My=86 X 40 + My=0

My=3440 ft lb

∑Mz = 0