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Anchorbolts - Six Bolt Pattern Question

Anchorbolts - Six Bolt Pattern Question

Anchorbolts - Six Bolt Pattern Question

(OP)
If we have a wide flange column with both gravity forces and potentially uplift forces, and the calculations determine we need (6) anchorbolts, does it matter if the six bolts are placed across the flange side of the baseplate instead of across the open web side?

Bending of the baseplate is not an issue on this particular column.

See my attached detail.

Now, I'm not talking about preferences......I am wondering if there's any code requirements on this.....or any technical reason the bolts should be oriented one way or another.

I appreciate the opinions.

RE: Anchorbolts - Six Bolt Pattern Question

I think that you're free and clear to use either arrangement.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

RE: Anchorbolts - Six Bolt Pattern Question

Best to use scheme "A" with uplift unless it's a really small load. Scheme "B" tends to load the bolts closest to the end of the flanges the most and also loads the flange weld in that area too.

LonnieP

RE: Anchorbolts - Six Bolt Pattern Question

Version "B" (the six anchor bolt holes parallel to the web) better spreads the uplifting and moment loads from the flange-to-baseplate and web-to-baseplate stress loads to the baseplate across more area. That area around the flange and web fillet welds is more uniformly distributed between the bolt holes and their hold-down forces.

Also, access is better for faster bolt hole torqueing and mounting.

RE: Anchorbolts - Six Bolt Pattern Question

With uplift, I think your statement that "Bending of the baseplate is not an issue..." is wrong. Maybe you mean there is no moment at the column base. Either pattern can be used, just design the baseplate accordingly.

RE: Anchorbolts - Six Bolt Pattern Question

Add two bolts, make it 8, and make the layout symmetrical.

That way your strength concerns disappear and the contractor can't bugger up the layout.

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