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| angle iron deflection | |||
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| Posted by: jjackson ® 02/11/2010, 22:49:07 Author Profile eMail author Edit |
i am building a shelf in my garage that is 103" wide... i would like to have no middle support... there will be about 60 pounds sitting at the midpoint of the 103"... the shelf is 4' deep.... how much deflection would this 60 pound load cause at the midpoint of the 103" span if i were to use 2x2x3/16 angle iron to hold the front of the shelf? thank you,
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| Posted by: RWOLFEJR ® 02/12/2010, 17:05:51 Author Profile eMail author Edit |
It isn't realistic to expect a load of only 60 lbs. on a shelf that big. Use channel... about C4 x 5.4 should handle about a half a ton. Don't want to put the time and money into a shelf that's only good for bags of feathers when you know somewhere down the road someone will climb up on it and heavier things will be stacked on it. The channel will cost you an extra dollar... maybe a few? Your angle iron would start to deflect some just under the weight of your shelving materials alone. (Asuming some plywood or something on the angle.) Seems like I've heard about this 103" long x 4 foot deep shelf before on this site...? Is this homework? If it is you might want not want to use my answer... |
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| Posted by: jjackson ® 02/18/2010, 22:53:18 Author Profile eMail author Edit |
thanks for the advice about the channel... i work with wood usually and am unfamiliar with what metal can do... i'm impressed with what channel can do from what you say... thank you, i think that is the way i will go.... no, not homework other than some work i'm doing at home.
jjackson. |
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| Posted by: kunk ® 02/23/2010, 02:48:12 Author Profile eMail author Edit |
I would not use angle iron. Horrible section properties. I ran a quick number for you and came up with under 0.100" deflection at center span using 2" square section structural mild steel tube with a similar wall (E of about 29 x10^6 psi). I assumed that your supports were about 4" from each end. Also remember that the stiffness goes with the ^3 of the section depth...hope this helps...kunk |
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