steel beam flange - Von Misses control? 1

[gmd255]

Hi guys. I have a steel beam that is loaded with distributed load + concentrated - point loads at the bottom flange.
So in bottom flange there will be stresses from bending of the beam because of distributed load (qd) + thre will be stress perpendicular to that because of point load acting on the edge of a bottom flange. I was thinking about using Von Misses criteria for this. The problem is it has been ages since I have used this. I forgot a lot. is it allrigt to use 'plane' equation for this and Gyy as G1 and Gxx as G2?

 

[dik]

The attached spreadsheet may be of interest:

 

[KootK]

You may be able to borrow a checking method from this paper by Galambos: Link

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[dik]

kootk... you have a circular link...

Dik

 

[TehMightyEngineer]

It worked for me.

Also, the flange bending equations for crane wheels would be where I would start; CMAA 74.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

https://www.facebook.com/AmericanConcrete/

 

[dik]

For some reason, it brings me back to this page...

TME... the spreadsheet has this info...

Dik

 

[WARose]

I was thinking about using Von Misses criteria for this.

Why? Seems to me like this would be solved using code applicable equations for bending, (local) flange bending, and torsion. Von Misses won't begin to deal with the LTB situation or the resulting warping.

 

[gmd255]

WARose why not? its a combination of stresses in bottom flange. Stresses that are perpendicular to one another and are both acting at the same time.
dik and Kootk, tnx. Will look up what you posted.

 

[TehMightyEngineer]

Oh, sorry dik, I missed your spreadsheet post. It was too short and to the point.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

https://www.facebook.com/AmericanConcrete/

 

[dik]

no problem...

Dik

 

[WARose]

WARose why not? its a combination of stresses in bottom flange.

Just seems like there are faster ways to address it. If you want to be sure you've accounted for the combined stresses (as per Von Misses)......you can always just add up the utilization ratios.

 

[BAretired]

Hi guys. I have a steel beam that is loaded with distributed load + concentrated - point loads at the bottom flange.
So in bottom flange there will be stresses from bending of the beam because of distributed load (qd) + thre will be stress perpendicular to that because of point load acting on the edge of a bottom flange. I was thinking about using Von Misses criteria for this. The problem is it has been ages since I have used this. I forgot a lot. is it allrigt to use 'plane' equation for this and Gyy as G1 and Gxx as G2?

Von Mises, not Von Misses.
Have you considered the torsion applied by the eccentric loads F?

BA

 

[dik]

BART... it's from the misses... stressed out again...

Dik