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Fillet Weld Stress Distribution - Directional Method Eurocode 1

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N G P

N G P

Structural
May 15, 2018
33
Good Day All,

I have a doubt regarding the computation of weld stresses using the directional method of Eurocode 3- Part 8. How we can distribute a vertical force as shown in the picture into shear stress and normal stresses? As I understand a portion of the forces will be carried by vertical weld as parallel stresses and other portion to horizontal weld which will eventually divided to shear components.
But could someone shed light on how to calculate it in proper way?

Thanks!

20230221_165550_ceriwq.jpg
 
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Thanks GaryHStr,

I understand this is not a straightaway easy method to calculate the stresses accurately. However, do you have any chance some text or journal references to see this method in detail.?
 
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N G P,

Just as a public service announcement, be cautious about any answers GaryHStr gives you. A few members here, myself included, suspect that Gary is a bot or someone who is just copy/pasting answers into/out of ChatGPT. So the answer may have a lot of "information" in it, the information could be misleading or incorrect.

Scroll towards the bottom of this thread for more info: Thread
 
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Packard suggests not using the directionality of welds for HSS due to the eccentricity of the load on the weld due to only being able to apply the fillet weld on the outside surface of the HSS.

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1677079798/tips/HSS_Article_DesignFilletWelds_RectangularHSS_0615_060120_bqzuft.pdf[/url]

If you do a lot of steel design with HSS sections, you should seriously look at becoming a member of the Steel Tube Institute. They are a great outfit.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik
 
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Having asked ChatGPT some engineering questions for fun, that answer (GaryHStr) is almost certainly from the AI and could be pure nonsense. I tried asking EC related questions, and the eurocodes are not part of it's learning resources.
Ask it to code something for you however, and it's really helpful,

The last line is always included in some form in it's answers:
...it may be helpful to consult with a qualified engineer or use specialized software to ensure accurate results.

 
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Thanks for the 'heads up'. This type of activity could be downright dangerous.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik
 
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Fox... Do you have a diffeent link? Thanks...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik
 
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Hi dik

I altered the link it should work now👍😀

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
 
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Thanks desertfox for the reference.
The reference which is based on the AISC code mainly mention two methods; Instantaneous Center of Rotation Method and Elastic Method. Considering the elastic method, for forces normal to the faying surface, the shear and tension forces can be summed vectorially to find the resultant shear stress and compare to the weld resistance as shown in the equation.
BGSCM0506EQ1_ctdldc.gif


However, if we have force along the side ways direction also (say fz) which would be in the line parallel to the weld axis, can we vectorially sum that also?. Like this
Capture_tn3hvc.png
?
 
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Hello Dik,
I understand that the directionality shall be ignored in the case of HSS members welding as per AISC. I saw the reference in Section J3.4.2 of AISC 360.

But I think the directional method in BS EN 1993-1-8 Section 4.5.3.2 is different from the AISC 360's the directional strength increase factor.
 
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Hi NGP

I perhaps have misunderstood your original post but the diagram showing P acting downward is as I see it the same as in the link I posted and the only difference I can see is that you have a horizontal weld running along the bottom of the section whereas the diagram in the link doesn’t.
So I thought that you just had bending stress plus the shear in the x and y directions, I can’t see anything else. Please explain if I am missing something.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
 
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N G P said:
However, if we have force along the side ways direction also (say fz) which would be in the line parallel to the weld axis, can we vectorially sum that also?.
Click to expand...

If you also have a load in the z-direction (see below), you can sum the vectors using:

fmax = √((fx + fb)² + fy² + fz²)​

fx - axial stress from Px
fy - vertical shear stress from Py
fz - horizontal shear stress from Pz
fb - axial stress from Py*e and Pz*e

Welded_HSS_Coordinates_a6rakp.png


Structural Engineering Tools: Structural Engineering Videos:
 
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Hi

If there is a sideways force as shown in ProgrammingPE’s post then you have bending stress at ninety degrees Tao that in the y direction.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
 
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Hello Desertfox, I missed to show the sideway forces in the opening post. However, the question I have asked is mentioned by ProgrammingPE.
 
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Hi NGP

No problem and glad it’s got sorted now👍

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
 
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or if you have SMath running...

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1677815704/tips/Weld-Group_HSSr_ml3qnk.pdf[/url]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/raw/upload/v1677815704/tips/Weld-Group_HSSr_y99ppw.sm[/url]


-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik
 
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