BOLTED BEAM TO BEAM ANGLE CONNECTIONS

[borisng]

Dear Sir/ Madam,

We have framing with beams W12x22 and W10x12. The web thk. of both of it 3/16". The same time we use double-angle
( (2)-L 4x3 1/2x5/16 )connections with wide gage 5 1/2".

It seems to me we can not do it because max. spacing should be 3/16" x 24 = 4.5" and in that case we should use narrow gage 4" ( (2)-L 3 1/2x3x5/16 ).

What do you think about it?

Sincerely,

 

[Lion06]

Is the large bolt spacing an attempt to use (2) bolts instead of (3) with a "full depth" shear connection?

 

[nutte]

You're going overboard reading into the maximum bolt spacing requirements. I believe those apply to surfaces in contact, and you don't have 5.5" of contact in this case. There's a gap in between the angles.

Even without the gap, as if it were an end plate, I wouldn't apply this to the spacing (gage) you're looking at. Maybe that's not right, but that's what I would do.

 

[borisng]

Dear NUTTE,
Thank you for your answer.

It seems to me all bolts consist of one group of bolts.
I suppose that this requirement provides a work of bolts together and reduce deformations in connection - as web as angles.

What do you think?

Sincerely,

 

[nutte]

This requirement provides close enough spacing, and thus clamping between plies, to prevent moisture from getting between the plates and corroding the material.

 

[borisng]

Dear NUTTE,

What you would do if you need to make built-up beam (girder) with web 3/16" thk. and to make assembly with bolts or rivets?

Sincerely,

 

[StructLin]

Hi, borisng:

I am not quite catch your question. To me, I don't see any problem with double 4x3 1/2x5/16 angle clamping on W10x12 I-Beam web, then, the two flat face of double angle bolt to one side face of the W12x22 I-Beam web. So what is your problem? Maybe, I misunderstood your question?

 

[StructLin]

By the way, on AISC 13th Edition, the thickness of the web of W12x22 is 0.26" (or 1/4"), not 3/16".

 

[borisng]

Dear StructLin,

there is some limitations for max. distance in bolt's (rivet's)group between bolts (rivets)as you know.
One of it for web 3/16" thk. is 3/16" x 24 = 4 1/2".

Sincerely,

 

[borisng]

Dear StructLin,

Sorry, I mean W12x14.

Sincerely,

 

[kslee1000]

Usual gage "g" for 3 1/2" leg is 2". For 3/16" web, the minimum distance between bolts is 2"+2"+3/16" = 4 3/16".
Round up to 4 1/4", or 4 1/2", would this work?

 

[borisng]

Dear kslee1000,

I agree, my point is that we cann't use gage more than
4 1/2" for web 3/16" [ because max. spacing should be 3/16" x 24 = 4.5" and in that case we should use narrow gage 4"
( (2)-L 3 1/2x3x5/16 ) ].

Sincerely,

 

[kslee1000]

Can you please enlighten me, from where you got the terms "wide gage" & "narrow gage"?
For your case, if either the 3 1/2x3x5/16 or 4x3 1/2x5/16 works, I don't see the argument for choosing the lighter one.