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walkereng, Consultant
Category: Structural Engineering
Satisfied Customers: 2600
Experience:  Over 30 years of Structural Engineering experience.
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Have 52 foot span. Want to pick 1500 lbs Want a trolley to

Customer Question

Have 52 foot span .
Want to pick 1500 lbs
Want a trolley to go 50 foot
Want trolley to rotate 360 degree
And trolley out 12 feet
What size beam would it require?
Rafters are at bottom 9 foot
Spread footings are a must to hold column
NEED advise
Thank you for your experience and time
Daryel Edwards
Want to be set up to retire (52 years old now )
I have a 42 foot x 52 foot metal building .
I love building hot rods and mean street cars and trucks
Submitted: 11 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 11 months ago.


Expert:  StructuralEng replied 11 months ago.

Do you have a sketch or picture of exactly what you want?

I was with you until the "trolley 12' out" part. I want to make sure we're seeing the same thing.

Customer: replied 11 months ago.
50 foot span will go east to west the 12 foot arm will rotate 360 degrees on its own trolley
Expert:  StructuralEng replied 11 months ago.

That will be a cantilever off of the beam?

Customer: replied 11 months ago.
Expert:  StructuralEng replied 11 months ago.

I think that cantilievering 12' off of a WF spanning 52' is not practical. You'll need some way to resist the torsion in the beam.

Customer: replied 11 months ago.
Here is the deal
I asked a real ? that charged my credit card 54$
I understand that we all want to make money
You may be 30 years old but you don't have 30 years at engineering structural
I thought you could save time
AND money for me
Wife is pissed (54$ )
For no answers
Expert:  StructuralEng replied 11 months ago.

I can, and will, gladly size the beam for you, but what I'm saying is that for a beam to span 52' and have a 12' outrigger is not realistic. The angle of twist induced in the beam would result in so much deflection at the tip of the outrigger that it's not practical. I'm sorry you're not happy thus far, but based on the description provided it's difficult to say more. I can size the beam assuming no torsion and you will need to determine how to resist the torsion or have two of the beams some distance apart so it imposes an up/down force couple instead of torsion.

Expert:  StructuralEng replied 11 months ago.

Also, I'm not 30 years old and my age has nothing to do with this. I will request a refund for you. Good luck with your project.

Customer: replied 11 months ago.
Ok down force is 1500lbs at end
I understand there is not a beam that will handle
If it is designed for upper bracing and lower conicle it would be do able
Need beam flange and Web thickness
Expert:  StructuralEng replied 11 months ago.

I apologize for the delay. The question was locked for several days. Let me know if you would still like help and I will get the size for you right away.