Replacement of W18x76 with a Built up Section

[tmgczb]

I have no experience nor knowledge of composite sections built up sections.
Now vendor for our project is suggesting that we replace W18x76 with a built up section.
The thickness of steel plates is 18mm and 12mm, connected by fillet weld 8mm at both sides of web plate.

 

[desertfox]

Hi dik

Sorry I cannot find as yet what the 106/109 is but the Med is the design moment.

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

 

[dik]

Thanks... I'll go through the paper again to see if I can apply the methodology. I find, sometimes, papers leave gaping holes where they assume you know what they are talking about.

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

-Dik

 

[BAretired]

dik,

106/109 is a misprint. It should read 10^6/10^9 (for unit conversion).

BA

 

[dik]

Thanks, Bart...

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

-Dik

 

[BAretired]

dik,

I believe that the standard formula for s should read:
s = 400 x 9000 x 285/ (1.6 x 10⁹),
but I don't know where 9000 or 285 comes from, offhand.

W_p is not defined, but appears to be a volume with units of mm³

Quite a confusing article.

BA

 

[dik]

From the formula, it's likely related to Section Modulus.

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

-Dik

 

[BAretired]

I think W_p is the statical moment of the flange about the centroid of the shape (which we call Q).
Flange area = 30*300 = 9000; y = 300 - 15 = 285.

BA