Universal column bolt holes

[baker332]

Hi all,

On my struc calcs it mentions either bolting or welding two steels together 3000mm UC 152x152 30 x2 - however there is no mention of the space between the holes, the spacer to use or the bolts.

Anyone have a standard formula?

BC had passed these calcs without any questions.

Thanks

 

[freddiemercurystwin]

Your SE should have included a sketch of the splice detail, sometimes they're hidden away in amongst the calcs? Or sometimes the fabricator does it.

 

[baker332]

From research this is the norm:

Spacer tubes at 400mm centres staggered 50mm above and below the centre line M16 bolts.

 

[freddiemercurystwin]

Some on here would argue fixing together is unnecessary.

 

[RonnyRaygun]

From research this is the norm:

Spacer tubes at 400mm centres staggered 50mm above and below the centre line M16 bolts.

Sounds about right. M12s would be plenty.

Some on here would argue fixing together is unnecessary.

It doesn't help to spread the load between the beams as the beams can still move independently of each other. Therefore they don't really share the load equally and so I always design the beams to take the load of the masonry leaf they are carrying if they're under a cavity wall.
Fixing them together does offer a bit of additional stability though and reduces the effective length a bit.

 

[baker332]

Thanks Ronny, I'll drop down to M12s if you think that's enough.