Need help with statics problem -- Structure to hold 1300 pounds

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Trying to build a structure but not sure if i am doing it correctly

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So given a force F that is at r1/2, distances y, r1,r2,and r3. What is x?
 

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  • #2
berkeman
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What is the context of your question? Is this for schoolwork?
 
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Im trying to build a structure that can hold a 1300 lb supersack full of walnuts for work.
 
  • #4
phinds
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What is x?
Since you have given us no idea what constrains you want to put on x, how could we know? What is it you are trying to achieve?
 
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Does x need to have a constraint? Its a statics problem. I figured you sum up the forces in the x direction, sum up the forces in the y direction and sum of the moments and solve for x. Seems pretty straight forward im just trying to check if i did it right so i want to see how someone who knows what they are doing, does it? The one thing i realized i left out is the angle of those angled beams. They should be 45 degrees.
 
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phinds
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Does x need to have a constraint? Its a statics problem. I figured u sum up the forces in the x direction, sum up the forces in the y direction and sum of the moments and solve for x. Seems pretty straight forward im just trying to check if i did it right so i want to see how someone who knows what they are doing, does it? The one thing i realized i left out is the angle of those angled beams. They should be 45 degrees.
??? x is a DISTANCE, not a force, at least the way you have it drawn.
 
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Yes exactly. Its a distance. I need to figure out how long that beam should be so thing thing doesnt fall over from the weight.
 
  • #8
davenn
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Yes exactly. Its a distance. I need to figure out how long that beam should be so thing thing doesnt fall over from the weight.
and what are you wanting to build the structure from ?
anything less than very strong and it will buckle long before it topples over
 
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phinds
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Yes exactly. Its a distance. I need to figure out how long that beam should be so thing thing doesnt fall over from the weight.
Well, that's trivial. x has be be a minimum of r1/2 + r2 - r3. In practice you'll want it a bit longer. Personally, I'd go with x = r1 + r2 - r3
 
  • #10
jrmichler
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You want to hold a 1300 load, but don't know how to keep it from tipping over. I strongly suggest talking to a real engineer.

BTW, those angle braces do exactly nothing for the strength of the vertical column. Can you explain why?

Well, that's trivial. x has be be a minimum of r1/2 + r2 - r3. In practice you'll want it a bit longer. Personally, I'd go with x = r1 + r2 - r3
If it was my job, I would want the front support at least 2 feet past the center of gravity of the 1300 lb load. Preferably a little more, or a lot more depending on the height. And anchor it to the floor.
 
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phinds
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You want to hold a 1300 load, but don't know how to keep it from tipping over. I strongly suggest talking to a real engineer.

BTW, those angle braces do exactly nothing for the strength of the vertical column. Can you explain why?


If it was my job, I would want the front support at least 2 feet past the center of gravity of the 1300 lb load. Preferably a little more, or a lot more depending on the height. And anchor it to the floor.
Sure, but he gave a very simplistic problem and I gave him a simplistic answer.
 
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You want to hold a 1300 load, but don't know how to keep it from tipping over.
As far as that goes, what keeps it from tipping over sideways?
 
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and what are you wanting to build the structure from ?
anything less than very strong and it will buckle long before it topples over
Its being built out of steel
 
  • #14
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As far as that goes, what keeps it from tipping over sideways?
Well it will have two of those side frames about 4 ft apart with connected cross beams
 
  • #15
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Well it will have two of those side frames about 4 ft apart with connected cross beams
One at each corner
 
  • #16
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We need to be able to drive a forklift to be able to rest straps from the supersack on the top bars sticking out
 
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Sure, but he gave a very simplistic problem and I gave him a simplistic answer.
I wanted to see how you would use statics. Like sum the forces and the moments. I wanted to see how its done
 
  • #18
berkeman
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Thread closed temporarily for Moderation (safety issues).

Because if the inexperience of the OP and the heavy loads involved, this thread will remain closed. Thanks to all who responded.
 
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