Maximum weight a bar and cables can hold before breaking

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The discussion focuses on determining the maximum weight W that can be supported by a bar and cables in a structural system, using static equilibrium equations. Participants emphasize the importance of calculating the loads in each structural member in terms of W, as these loads will be proportional to the applied weight. The need for accurate unit vectors for the cables and bar is highlighted, as they are essential for resolving forces. The calculations involve using the equations of equilibrium (ΣFx, ΣFy, ΣFz) to find the forces acting on the structure. Ultimately, the goal is to identify the maximum allowable weight W that does not exceed the strength limits of any member.
  • #31
Alison A. said:
So I am finding all the forces from the moments first then applying those to the force equations?
No, you use the one moment equation I indicated,

ΣMz = FAB(12) - FAC(18.46) = 0 to find FAB in terms of FAC

Then, you can substitute FAB back into the force equations to find the other forces in terms of W.
 
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  • #32
SteamKing said:
No, you use the one moment equation I indicated,

ΣMz = FAB(12) - FAC(18.46) = 0 to find FAB in terms of FAC

Then, you can substitute FAB back into the force equations to find the other forces in terms of W.
Alright I found FAB to be (4615/5539)W and FAC to be (3000/5539)W
 
  • #33
Alison A. said:
Alright I found FAB to be (4615/5539)W and FAC to be (3000/5539)W

And from there force equations I found FOA to be -0.6983W
 
  • #34
WOOOOOOOOOOOOOO:oldsurprised: I got the right answer. Wow that was a lot of work, I think I've gone through about 10 pages of paper. :bow:Thank you so much for sticking with me even when it seemed like I couldn't grasp the most simple concepts . Could you help me find the last part to my other problem you've been answering? That is my last problem... then I'm finally done.
 

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