Block Shear Rupture on a Gusset Plate 2

[Leftwow]

Good Morning,

I am using AISC DG 29 Vertical Bracing to check some connections. If I am checking blocking shear rupture on a gusset plate with a SINGLE ROW of Bolts, would my failure path be only the dimension of the bolt holes? Check figure 5-2b if you got it.

 

[jayrod12]

Would you not have bearing failure prior to that failure mode? I don't think anything addresses block shear on a single line of bolts because it is not a controlling failure mechanism.

 

[Leftwow]

So what you are saying is, there can't be block failure because there is only a single row of bolts and the whole idea of block is multiple rows of bolts.

 

[TehMightyEngineer]

You can have block shear in a single row of bolts but as jayrod said; I'm almost positive that bearing strength will control always.

That doesn't mean that block shear isn't possible; you can have block shear to a free edge, but this is unlikely to control for a single line of bolts assuming normal edge distances.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

http://www.americanconcrete.com

 

[Leftwow]

I'm designing a spreadsheet with all the failure modes, I guess it would just be to the closest free edge. I see what you mean, my gusset is thicker than my beam and has way more material to break through. So this is unlikely. Thank you for your responses

 

[nutte]

The tear-out portion of the bolt bearing check is analogous to block shear on a single line. Tension area equals zero. Shear area equals two times the shear length. Block shear: 2*0.6*Fu*t*(summation of Lc). Bolt bearing: 1.2*Fu*t*(summation of Lc). Same thing. (Nearly the same thing. Block shear does subtract an extra 1/16" from the hole diameter. Bolt bearing doesn't, but perhaps it should to be consistent.)

Also, we have design examples from AISC spanning many years, and they have never checked block shear on a single line of bolts. That's a pretty good indication that it is not a check we need to concern ourselves with.