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Tool Talk Discussion Forum

C channel. strength question..

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Truck

03-30-2006 18:56:14




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Just curious if anyone knows which way a C channel would have more strength, laid flat with the U up or laid flat with the U down? My guess would be U down, flat side up.

Application would be a pair of ramps to drive a vehicle up on to, similar to the Kwiklift.. I have some old ten inch C channel with 1/4 inch thick web. Pretty tough stuff.

Thanks, engineers!

Truck




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ednillinois

04-06-2006 19:58:06




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 Re: C channel. strength question.. in reply to Truck, 03-30-2006 18:56:14  
back in a ditch no need for ramps just drive on LOL



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Jerry F

04-01-2006 18:16:53




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 Re: C channel. strength question.. in reply to Truck, 03-30-2006 18:56:14  
you must be young and strong to want to sling around 10" channel. Thats going to be a back breaker after awhile. I would try and figure out something lighter, but thats just my old bad back talkin ;^)



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Truck

04-02-2006 17:30:11




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 Ummm, no trailer ramps...lol! in reply to Jerry F, 04-01-2006 18:16:53  
Here's a link to what I am attempting to copy, with some improvements...I know what you mean if it was going to be a trailer ramp I'd have to be nuts! This is actually a low rise lift.

Thanks for your concern!:-)

Truck



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Jerry F

04-03-2006 07:14:54




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 Re: Ummm, no trailer ramps...lol! in reply to Truck, 04-02-2006 17:30:11  
Par for the course for me to chime in from left field and think we are on a whole differnt toppic. Most guys might have learned their lesson by now, but not me... lol Now that I "see" what your talking bout I agree with the others, flat side up , legs pointing down. with the lift points placed close to the wheel base of the tactors there wont be that much pressure to worry about them bending



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Vince H

03-31-2006 09:20:53




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 Re: C channel. strength question.. in reply to Truck, 03-30-2006 18:56:14  
Either way the flanges are being pushed the same direction so it wouldn't make a difference. But, with the flanges up you now have the chance of the flange bending to the side. So I would go with the flat side up.



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jhill

03-31-2006 05:15:23




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 Re: C channel. strength question.. in reply to Truck, 03-30-2006 18:56:14  
Facing down would be stronger. Facing up the flanges are in compression and could buckle, Facing down they are in tension and would have to tear to fail. That being said you find lots of ramps on lift with the flange up.



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Chuck UR

03-31-2006 03:26:27




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 Re: C channel. strength question.. in reply to Truck, 03-30-2006 18:56:14  
Just guessing here but I would think that the strongest way would be with the 'U' facing left or right.
What you have is basically 1/2 of an "I" beam and you would want the web verticle.



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Truck

03-31-2006 03:31:12




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 but... in reply to Chuck UR, 03-31-2006 03:26:27  
I agree, but unfortunately driving a tractor up a ramp four inches wide is a little tough.. ;-)

I have to lay them flat for the particular use as ramps...

Looks like I will probably have U facing down, as it seems the strength is equal either way and that will be easer to build.



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Bus Driver

04-01-2006 14:43:41




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 Re: but... in reply to Truck, 03-31-2006 03:31:12  
3" channel turned up on edge is stronger than 4" laid flat. Less weight, too. I built my ramps from the 3" and used 1/4" thick angle iron for the cross pieces. No problem for the tires.



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bjb in NE

03-30-2006 20:28:52




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 Re: C channel. strength question.. in reply to Truck, 03-30-2006 18:56:14  
Looking in the AISC (American Institute of Steel Construction) Steel Construction Manual (13th ed), there was no apparent desigantion of differences in bending about the minor axis (U up or down).



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Tim Casbolt

03-30-2006 19:40:07




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 Re: C channel. strength question.. in reply to Truck, 03-30-2006 18:56:14  
Not an engineer, but I play one at work. Torsion load, tension load, either way would be the same. When you build it, make it easy on yourself.



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