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28 November, 13:57

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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  1. 28 November, 14:14
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    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
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