Posts Tagged ‘support’

How much weight will 2″ aluminum angle support?

Monday, August 6th, 2012

Question by wskinn: How much weight will 2″ aluminum angle support?
I am building the benchwork for a portable model railroad. I would like to use 2″ aluminum angle bonded to the edges of 2″ thick x 24″ wide pink board insulation panels. How much weight can I put on a 5 foot span? Rough guesses are good, telling me where I can find aluminum angle span tables would be great!

Best answer:

Answer by Bomba
We could use some more information on the angle, but I will just pick one, a 2″x2″x3/16″ having a section modulus (Z) of 0.19.
Also I will presume the load from the table contents is uniformly distributed and not concentrated in the center, and that the span is simply supported. Annealed low alloy aluminum has a tensil strength of about 12000 psi. I will use half of that for the design stress. (I would use even less if it was a larger more serious structure.)
The bending moment “M” for that configuration is WL/8 where W is the total load. L=60″ so M is 7.5 W
The formula for bending stress is S = M/Z
6000 = 7.5W/0.19 so W is 152 pounds distributed across the 5ft length.
If the allowable load was indeed concentrated in the center it would be 76 pounds and the deflection downward would be about 1/8″
This is a bit on the conservative side so I would not be concerned with a 100 pound concentrated load directly on the angle.

Know better? Leave your own answer in the comments!

Would you support the USA as an exclusively nuclear energy entity with electric cars/trains for transport?

Friday, March 23rd, 2012

Question by Baby Raptor: Would you support the USA as an exclusively nuclear energy entity with electric cars/trains for transport?

Best answer:

Answer by a_bush_family_member
Why not use hydrogen powered cars?

Nuclear reactors can easily extract hydrogen from water. That hydrogen can then be used in car’s fuel cells.

BMW World – BMW Hydrogen Cars
http://www.bmwworld.com/hydrogen/

BMW to lease hydrogen cars in April – Green Machines – MSNBC.com
http://www.msnbc.msn.com/id/14798876/

Give your answer to this question below!

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