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Re: Mixing Bolt Diameters

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In my opinion is bullshit. Why someone needs to do that? Are you "nuts" or
"bolts"?
Ivan Lippi
Structural engineer
----- Original Message -----
From: "Carter, Charlie" <carter(--nospam--at)aisc.org>
To: <seaint(--nospam--at)seaint.org>
Sent: Monday, July 14, 2003 11:52 AM
Subject: RE: Mixing Bolt Diameters


> >Does AISC have any requirements with regard to
> >mixing bolt sizes in the same connection? I know
> >there are restrictions about mixing bearing, slip
> >critical and welds in the same connection but
> >what about different sizes?
>
> I don't know of anything that permits or prohibits this. As a general
rule,
> I do not think it is a good idea, but perhaps it depends upon the
> application and what loads are shared and not shared.
>
> Mixing bolt diameters in a shear connection would probably not work. How
> would the connection know how to send more load to the stronger bolts?
This
> same idea would apply to any group of bolts sharing load equally.
>
> Mixing bolt diameters in a more complex connection where there is shear
> transferred by some of the bolts and tension forces transmitted by others
> would likely be OK, as long as the bolt groups have consistent bolt sizes.
> Or maybe some of the other bolts are not for load considerations. For
> example, if a moment end-plate connection is designed with all of the
moment
> and shear carried by the flange bolts of a consistent diameter and smaller
> diameter bolts are used to pull up the middle of a deep connection, I
don't
> think that would be a problem. I suppose one could also come up with
> eccentric load cases where the bolt diameters could vary and be
acceptable.
>
> Hope this helps.
>
> Charlie
>
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