Welding I-beams together

[Streetcar]

All your stresses are in the flanges not the web. Your picture only shows the web.

The question is if you have to ask people on an anonymous tractor forum if your structural welds are good enough for a building then you probably have bigger worries like ‘is this building going to fall on my head - or my grandchildrens heads - or the neighbors...’

Great response.
The building can get large wind loads.
With the peak in the roof,you have different loading than simple beam
Definitely need fish plates on flange.
With only two beams the structure has fracture critical welds. One mistake on the beams and the whole thing falls

 

[bdog]

All your stresses are in the flanges not the web. Your picture only shows the web.

The question is if you have to ask people on an anonymous tractor forum if your structural welds are good enough for a building then you probably have bigger worries like ‘is this building going to fall on my head - or my grandchildrens heads - or the neighbors...’

I am not really doubting my welds. I have built a half dozen steel buildings since the mid nineties and all are still standing today. One in particular survived a tornado that did considerable damage to the house less than 100’ away. I have also welded lots of scary things like trailer hitches, gooseneck conversions, pintle hitch plates, on dump trucks, etc.

I simply have never had to join I-beams together like this before and was just asking for advice on what reinforcements if any were necessary.

 

[yomax4]

Mine are similar and they have fish plates anywhere the I-beams are joined. Good luck with the new building.

 

[CADplans]

My 57 X 48 "L" shaped shed has a welded frame,, I fish plated every joint I could,,

The only wood fastened in my building is the flooring in the upper storage area,,

The building has been up for 20 years,, and gone through at least two 36" snows,,

 

[Streetcar]

Bdog
You have picture if welds on web. Flange will have highest stress.
Because of the angled joint , you will have buckling stress in web.
Both areas should be reinforced with fish plates

 

[bdog]

I added some plates on the side. Coupled with the extra portion of an I-beam on the bottom I think it should be fine. I stood each truss up vertically on the ground and got triple pass welds across the top flange and on the insides of the bottom flange.

We got the trusses in place today. Only got two purlins up before we had to call it a day. Hopefully will finish most of the welding tomorrow.

 

[Streetcar]

Bdog
How are beams attached to columns?

 

[bdog]

Bdog
How are beams attached to columns?

The beams are sitting on top of the columns (which are made of the same material) and they have 40” of weld securing them.

 

[Industrial Toys]

Now that I see the erected structure, I would say the welds in question are quite important. If the outer ends were erected so they had no place to go outward, then there would only be compression between the two beams at the top.

 

[3Ts]

FWIW: My barn is built with trusses that are done the same way and is a 40' span spaced 20' apart. Also 12" beams although I don't know the weight. - and no reinforcing plates. I'll see if I can get a picture tomorrow.