Steel I beam - beam to beam connection in series

[lubos1984]

Hi guys,
I’ve sized a steel beam for a basement opening that requires an intermediate support. One end of the beam will be bearing down on the foundation wall and the other side will have a column / footing. The contractor is insisting to install two separate beams so that they meet and bear on the intermediate support. The column would be steel. My question is what is the most practical way to connect the beams together while also bearing on the post. I’ve seen details of the beams connecting to the sides of the post with bolts ? Also any issues or additional checks required in this approach ?
Thanks as always. Appreciate your responses.

 

[KootK]

I like bolted shear tabs either side of the hss post if the beams can simple span. You don't get the bottom flange stability issues that arise with Gerber system style connections where one beam runs over the interior column to support its neighbor.

 

[phamENG]

I agree with KootK. I've seen a residential steel application where the contractor decided to ignore the stability detailing for a continuous steel beam. The result was a buckled web, and a lawsuit.

 

[lubos1984]

thank you for the quick responses.
The current beam being replaced in the basement is a 8x6 dropped wooden beam. I'm removing some supports and replacing it with a W 8x58 beam. One span is 16'6" and the other span is about 8'. The new beams when put in place would need to be adjusted to ensure its level and snug against the joists, especially if there was some sag.

I'm typically used to circular adjustable steel columns such as the Tiger Brand that is often used here for residential applications for continuous beams. In those cases the beam is adjusted through the underneath column until it is snug and level against the joists. For this case using bolted shear tabs, i'm assuming these would have to be welded to the side of the post and the holes predrilled at the shop ? How would you be able to adjust the beam when placing it in place in the basement ?

Thanks again.

 

[XR250]

W8x58 for a 16'6" span?! There must be a whole lot of load on that. i might be concerned about a moment induced in the column due to the imabalanced spans. I would prefer the Gerber style system in this case that KootK alluded to and add web stiffeners over the column (although, honestly probably not necessary on a beam of those proportions). Around here, everything is cut and welded on-site so it is easy.

 

[phamENG]

That is a hefty beam. Probably don't need to worry about web buckling there (though you should check it, of course). One thing to keep in mind, the new beam is going to be somewhere on the order of 18x stiffer than the old one (EI). Make sure that's not going to have any negative serviceability impacts above. Sometimes, a ridge in the floor is just as bad as a valley. The span may make up for it as you said you're removing "some supports" but it's worth looking at.

 

[lubos1984]

thank you all for responses.
Regarding the Gerber connection, Does one beam need to run past the intermediate column, adjusted and then followed by attaching the other beam using bolted shear or moment tabs ? I only have one intermediate support. How would the connection detail look like ? (Attached is what I found on google)