Combined shear stresses for group welds 1

• Mar 8, 2021

• #2

dik

Structural

Apr 13, 2001

25,795

Something like the attached? It was cobbled together with a lot of help from Celt83...



Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

 https://files.engineering.com/getfile.aspx?folder=17fb3b65-3b40-4dd5-9ea0-08c5ac68ef7a&file=Weld-Group_W.sm

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• Mar 8, 2021

• #3

dik

Structural

Apr 13, 2001

25,795

in *.pdf...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

 https://files.engineering.com/getfile.aspx?folder=c6251537-b1c3-4cc2-9200-da853bf9f55c&file=Weld-Group_W.pdf

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• Mar 8, 2021

• Thread starter
• #4

mechengineer

Mechanical

Apr 19, 2001

256

@dik, Thanks.
Is there a simple manual calculation performed by Excel?

 

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• Mar 8, 2021

• #5

dik

Structural

Apr 13, 2001

25,795

Catch the thread... it's not really simple with Excel, either. The AISC sheet provides no numeric information... it's protected.

thread507-478293

and messages by DrZoidberWoop and Celt83; they provided excellent assistance... the Dr referenced Alex's spreadsheet and Celt had his own...


Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

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• Mar 8, 2021

• #6

dik

Structural

Apr 13, 2001

25,795

I was going to add that it's more fun when the loads are not applied at the centroid of the section... The SMath one is for a W section... but, I have them for all other sections and irregular outline.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

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• Mar 8, 2021

• Thread starter
• #7

mechengineer

Mechanical

Apr 19, 2001

256

@Dik,

Thanks for your concern. Due to Covid-19, I have been working at home. Singapore is not so bad. Hope you evrything going well.
I find the the way to combine those shear stresses. At first, divide all stresses vector along x, y, z axis, then combime it as sqrt (tx2+ty2+tz2).

Thanks.

 

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• Mar 8, 2021

1
• #8

DrZoidberWoop

Structural

Oct 17, 2018

338

Back in the olden days (2017) I made this "for dummies" explanation of the general elastic method for 2D weld groups, while studying for the PE exam. It's kicking around in a few places online. I didn't derive anything, just made the flow more suited to visual learners like myself.

 

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• Mar 8, 2021

• #9

dik

Structural

Apr 13, 2001

25,795

Not a concern... the Dr. is in...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

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• Mar 8, 2021

• #10

Celt83

Structural

Sep 4, 2007

2,020

DrZoidberWoop:
nice document there very informative. only minor caviate I would add is the under fz you note M c / I for the bending components of the stress this formula is really only correct for principal axis bending. For the shape you show in your document moments about the X and Y axis would be non-principal axis moments so you should really be using the general bending stress formulas, although folks have used My/I for years per Blodgett and not gotten into trouble, likely due to the highly conservative nature of the elastic method.

My Personal Open Source Structural Applications:

https://github.com/buddyd16/Structural-Engineering

Open Source Structural GitHub Group:

https://github.com/open-struct-engineer

 

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• Mar 8, 2021

• #11

dik

Structural

Apr 13, 2001

25,795

Celt... I noticed that in your spreadsheet and had missed it in my initial attempt... thanks...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

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• Mar 8, 2021

• #12

DrZoidberWoop

Structural

Oct 17, 2018

338

Celt83: That would be a really good update to the Tomanovich spreadsheet, and all the knockoffs I've come across. One of these days, I'll have to make the update.

 

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