- #1
KV-1
- 16
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A roof purlin, supported by a roof rafter must support a 300 lb vertical snow load.
Determine the component of of the snow load as a concentrated load “P” both perpendicular and parallel to the axis of the rafter.
I read that the perpendicular component of the 300lb force can be figured out by 300lb*cos(inverseTan(4/12)) and the parallel component can be figured out by 300lb*sin(18.43*)
I do not understand why this is so. My attempt at the solution is to draw an FBD, but I suppose I am drawing the wrong one.
Determine the component of of the snow load as a concentrated load “P” both perpendicular and parallel to the axis of the rafter.
I do not understand why this is so. My attempt at the solution is to draw an FBD, but I suppose I am drawing the wrong one.