## Calculate How Much Load A Flat Carbon Steel Bar Can Hold

## Calculate How Much Load A Flat Carbon Steel Bar Can Hold

(OP)

Can someone remind me how to calculate a load a flat bar can hold?

The material is steel. The dimensions are 1/4" X 3" X 6".

Thanks,

The material is steel. The dimensions are 1/4" X 3" X 6".

Thanks,

## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

TTFN (ta ta for now)

I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg

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## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

P is the concentrated load

L is is the distance between support points

f is the strength of the material (yield or ultimate, depending on how much deflection is allowed)

S is the section modulus = b*t^2/6

Rod Smith, P.E., The artist formerly known as HotRod10

## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

I always go back to the only useful structural equation (I exaggerate)

In the linear range M/I=s/y=E/R

With that little thing you can build models of tapered springs, beams with any load distribution, any number of supports, and composites.

In the rather banal case you have selected, at the centre of the span M=PL/4, I is 1/12bt^3, and y is t/2

Cheers

Greg Locock

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## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

https://www.engineersedge.com/calculators.htm

You have to pick out the supports and loading case.

## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

BA

## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

You are assuming the bar is loaded as a cantilever.

--

JHG

## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

No, BridgeSmith is assuming the bar is loaded as a simple span with concentrated load at midspan.

BA

## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

P is the concentrated load

L is is the distance between support points

f is the strength of the material (yield or ultimate, depending on how much deflection is allowed)

S is the section modulus = b*t^2/6

Hope this helps!

## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

This assumes that the OP is referring to a concentrated load at midspan of a simple span, which is not clear from his post.

If P is the applied concentrated load, then f is the allowable stress, about 0.6Fy.

If P is the factored concentrated load, then f = φF

_{y}where φ = 0.9, and S = plastic modulus = b*t^2/4.In either case, deflection should be checked for acceptability.

F

_{ultimate}should never be used for this calculation.BA

## RE: Calculate How Much Load A Flat Carbon Steel Bar Can Hold

Agreed. I did assume the bar was in bending about its 3" width dimension, simply supported at the ends of the 6" span. There are numerous loading conditions possible. Maybe I should have followed my first inclination and not bothered to respond to this thread. It's an ill-defined question that even a second year engineering student should have no problem with.

If ultimate tensile strength of the material is to be used, I suppose it would be correct to use the plastic section modulus to calculate capacity. As I alluded to in my previous post, the correct stress limit and section properties to use would depend on what constitutes failure - deflection beyond a certain value, yielding, or rupture/fracture.

Rod Smith, P.E., The artist formerly known as HotRod10