- #1
mw29715
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Homework Statement
I will attach a scanned pic of the problem, but it seems to be a basic frames problem. However, everything seems to have to many unknowns on it to solve. I feel like I'm missing something simple, but I can't seem to make any more progress.
Homework Equations
ƩM=0
ƩFv=0
ƩFh=0
The Attempt at a Solution
My attempt at a solution began with resolving the uniformly distributed load into a single force, 1050 lb. acting 3.5 feet from either side. The next step was to solve for any pin reactions that I could on the structure as a whole, which is:
Reaction at A Horizontal= 918.75 lb to the left
Reaction at F Horizontal= 918.75 lb to the right
I got these numbers from doing ƩM=0 around point A and F. I saw no way to solve for the vertical reactions at A and F, since any moment equations would eliminate both as they are colinear, and a moment equation around any other point would leave two unknown vertical forces. So I tried to move on to calculating forces on the individual members of the frames, but every piece seems to have to many unknown forces to solve for anything. I feel like I'm missing something basic, but we didn't spend much time on frames in class and have already moved on. I haven't had any problems with other frames in this section, so I'm at a loss. Any help would be greatly appreciated!