new to this - need reference on H-beam strengthening

[kingnero]

As I was mostly active in mechanical engineering (CNC machinery), I don't have much (if any) experience in structural connections.

I am trying to make a frame at home (for all the safety purists, don't worry: 1) it will be overdimensioned and 2) if it fails, I will be the only one underneath...)


I need information on the following:
When welding a piece of metal inbetween the flanges of a vertical H-profile, should I leave the corners open (not welded) or should I fully weld the plate's circumference?

I have seen examples from both practices, and I believe stress concentration is one view against a full weld.

Drawing included, the arrowed corner (+ mirrored corner) is what I need to know...

Many thanks for your views on this...

 

[Ron]

Unless you have high repetitive loads or high thermal stress, it makes little difference for a stiffener such as this.

Conventional practice is to cope the corners, but fundamentally, it's not a big deal unless you have one or both of the conditions noted.

 

[SteelPE]

Ron,

I was always taught no to will within the k distance on wide flange sections (any I shape). This was because of the residual stresses caused during the formation of the section. Applying weld in this location may cause the section to crack in this area.

 

[BAretired]

For some reason, I got a blank page when I opened the link in the OP. Anyone else find the same thing?

BA

 

[msquared48]

No problem here...


Hmmm...

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[dhengr]

BA:
Everyone knows you always insist on a sketch, so they just take every chance they can to antagonize you by making it difficult for you to get at it. Even I could open that one, it’s a pdf file.

 

[BAretired]

dhengr,

It is a mystery to me. I tried to open it several times and it kept coming up blank. Then I saved it to Desktop and tried to open it from that file...same thing, blank. When I look at the file's properties it tells me it has a size of 6.56kbytes.

I have been opening other pdf files with no problem. I dunno, maybe it's time to invest in a new computer.

BA

 

[BAretired]

Well, I re-booted the computer...same problem. Can't figure it out. Other pdf files are opening normally.

BA

 

[a2mfk]

Without really researching AISC standard detailing practices and all the reasons against welding that corner, its standard detailing practice to notch those corners. Keep in mind that the corner is not a real corner unless you made the beam yourself out of plates, it will be a radius, which is another reason to notch and not weld there. For actual axial force transfer in a stiffener plate you should never need that much weld anyway, if so, you have other problems you are overlooking

 

[BAretired]

Standard practice locally is to trim the corner off the stiffener so that it clears the bend radius. No weld on the radius.

BA

 

[kingnero]

thanks for your replies.

The vertical (and other) beams are standard items (with radii), not self-made out of plates.

I can't explain why the pdf file won't open, I tried from another comp and didn't have any problems.

another question for dhengr, is there a problem with pdf files? do you prefer JPG? It's just pressing another button when scanning... I prefer pdf as it's an all-platform document (eg when sending notes to collegues that work on Linux comp, they cannot open PPS, word doc, excel, so most e-mail attachments are adobe files).

 

[dhengr]

I prefer pdf files, and I have no trouble opening them. JPG files are usually O.K. too. But I do have trouble opening some other file formats. And, for all my harping on providing sketches and complete info. with questions, I just have some trouble working through some of these OPs. I don’t have all the bells and whistles on my system, and am a bit of a computer neophyte in these areas. And, I don’t have computer help right here in the office.

 

[BAretired]

I too prefer pdf files. I use them all the time. This is the first time I have been unable to open one. Anyway, I think I understand the question without seeing the file.

BA