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OT I beam

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alg

02-08-2008 17:47:23




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Have a 8" i beam with a 4" flange looks like 1/4' thick.5' long .It's bolted between two 12" i beams.Want to install a hoist trolley.What weight would the i beam be rated for.?????

Al




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Puddles

02-10-2008 12:08:00




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
I�m sorry! I should have said both of those beams were good for 19,000-pounds. Nineteen thousand pounds! Again I am sorry for the type-0!



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Puddles

02-10-2008 12:02:49




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
My �Manual of Steel Construction� does not show any 8-inch tall S-shapes with a 1/4-inch thick flange! Now it does show a W-shape with a 1/4-inch thick flange. W-8 x 13-pound. My �Ryerson� book, says an I-beam 8-inch x 18.4 � pounds point loaded in a 5-foot span is good for 1,900-pounds. A W-8-inch x 18-pound beam point loaded in a 5-foot span is also good for 1,900-pounds.



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Ted in NE OH

02-09-2008 10:28:01




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
Don't forget to calculate shear strength of fasteners.



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wyod

02-09-2008 08:55:55




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
Hey Al,
An engineer buddy of mine did a beam calc for me when I was planning on building an overhead crane system... according to his calculations, an 8" x 18 lb/ft beam (in my application, the beam was 20' long) would carry a 2,500# load with a safety factor of 3 (total weight @ beam failure would approach 7,500#)... soo... having said that, my guess is that it would be nearly impossible (with the type of projects most of us engage in) to overload your set-up. You could assume (shame on me) that shortening the length to one quarter of the beam length in my application, the load capacity would increase by a factor of 4. Although I'm not sure the equation would be linear... I think it would be safe to say that the maximum load at failure would probably approach 30,000#... figuring a safety factor of 3, as long as your load would not exceed 10,000#, you should be OK. If you do a search for "beam specs", you can determine the type beam you have ("S" or "W" -- height x lb/ft). Please understand that I am not an engineer, so my figures might be off a bit... If you want to be absolutely certain of the loading, consult an engineer. HTH, D

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moonlite 37

02-09-2008 03:19:16




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
In engineering school we had an expediate method that sometimes worked.It is called SWAG. Very easy to use but less accurate then the mathematical counterpart. It is more commonly known as Silly Wild A %# Guess.



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JMS/.MN

02-08-2008 22:46:43




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
I have no idea. My overhead shop hoist - I built from a 12 inch beam, center web. Top and bottom flanges are 5-6 inches wide. Each thickness is one-quarter inch, span is 19 feet. Made the trolley out of Ford car front axles- Pinto? Tauros?- don"t remember. Four of them support the trolley of half inch steel, with a two ton hoist hanging from it. OK- you can hang any ton hoist from it- doesn"t mean squat, but I unloaded a turning lathe with an 8 foot bed, and a large Milwaukee milling machine- each of them made it creak, easily a couple tons apiece.

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135 Fan

02-08-2008 22:20:55




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
The 8 inch beam by itself, only 5 feet will hold several tons. It does depend on the connection to the other beams though. Look at some shop presses. They work kind of the opposite but an 8 inch web will support quite a bit in a 5 ft. span. What do you want to lift? That might make it easier to answer your question. Dave



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Billy NY

02-08-2008 19:48:29




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
Short span here, have a 8" web 4" flange 1/4 " thick at flange tip ? Maybe it's a W8x something shape beam bolted into existing 12" web steel columns? Are the bolted connections fastened like typical structural steel flange connections, using astm 325 high strength bolts etc. ?

Might be good for a decent amount of weight, short span, but the connections have to hold as well, if you are rigging off it, to play it safe I'd detail it "as built" for an engineer to glance at, also take some photos etc. help him/her figure the steel shapes etc., not a hard one to figure, couple hours of an engineers time might give you a working limit with a safety margin, better to know than not if rigging any serious weight off it.

Also wonder if any quick reference (just for kicks) from an AISC hand book or related information from same would have any tables on beam sizing etc. Someone here might have access to AISC information.

If and when you do find out the max. load for the span, good idea to stencil and paint it on the web for future reference.

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RobMD

02-08-2008 18:25:18




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
5 feet long? Only? That's pretty much useless for a gantry crane.



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alg

02-08-2008 18:34:54




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 Re: OT I beam in reply to RobMD, 02-08-2008 18:25:18  
It's going to have a hoist hanging through a hatch and the side to side opening is only 5' wide.



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old

02-08-2008 18:09:32




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 Re: OT I beam in reply to alg, 02-08-2008 17:47:23  
Can't tell you for sure but it sounds like its heavier then the one I use in my shop which is made from a mobile home I-beam and I lift up things like the whole front end of my 1980 chev pick up with it all the time and it has yet to even show signs of giving way on me and the span is about 20 foot

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Bundee

02-08-2008 20:57:24




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 Re: OT I beam in reply to old, 02-08-2008 18:09:32  
horses for courses.. what weight are you going to lift??



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alg

02-08-2008 22:26:11




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 Re: OT I beam in reply to Bundee, 02-08-2008 20:57:24  
The hoist is rated for 1 ton.



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Bendee

02-10-2008 16:53:27




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 Re: OT I beam in reply to alg, 02-08-2008 22:26:11  
Ring up a steel merchant and tell him you are thinking of doing this what are his thoughts and what costs for materials , of course, you don't have to buy but may give valuable info.
Some stress "service" as their motto,put it to the test.



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