Can Posi truss floor joists work as lateral restraint for steel beam on the edge?

[UpsideDown]

I have this steel beam on the edge that has 4.5m long timber truss floor joist running into it on one side @450mm spacing and I am wondering if I can take the joist as lateral restraint?

 

[msquared48]

Probably, but why don’t you post a detail of the connection so we can see what you are talking about.

Mike McCann, PE, SE (WA, HI)

 

[UpsideDown]

Hi msquared48, connection detail should be something like this. I am not sure if we can use timber as restraints for steel beam

 

[jayrod12]

100% I would be using the joists as lateral bracing for the steel channel.

However, I'd be tightly shimming the gap between the steel channel and the floor sheathing. The beam sees that load anyway via the joists so you aren't doing anything by putting a gap except extremely taxing your sheathing in bending.

 

[UpsideDown]

Hi jayrod12, don't we need to take the stiffness of timber floor joist into consideration? what if the length increase to say 8 metres? what if the joist is not truss but normal timber solid sections? Is it necessary to run buckling analysis or no need to based on experience?

 

[jayrod12]

A sheeted floor is going to provide more than ample lateral resistance to brace the flange of a channel. The compression force in the top flange of the channel can't be enormous, and 2% of it will be minor. Assuming the sheeted floor has appropriate vertical lateral system supporting it, then I would say by inspection it's ok.