Light-framed 3-hour interior load-bearing firewall with large eccentric loads.

[Prestressed Guy]

I have an architect who has specified a 3-hour wall in a light-framed fire station (essential structure). On one side of the wall there is a 2-story living area with 13’ joists and roof trusses bearing on the wall. On the other side of the wall I have 59’ roof trusses. The reaction on each truss is 560# and 2320#.

The architect has called out the wall a single 6” steel stud wall with 3 layers of 5/8” GWB on each side. He has shown the trusses bearing on a ledger beam that is through bolted to the wall but this will defiantly not work.

I am not seeing any way to proceed with this concept. It would need to meet the requirements for a tied fire wall and I cannot see that happening.

Has anyone ever done anything like this?

 

[cdafd]

you might get a reply, but may want to ask the question here::

http://www.eng-tips.com/threadminder.cfm?pid=185

or here::

http://www.thebuildingcodeforum.com/forum/commercial-building-codes/

 

[chicopee]

UL has brochures on fire resistant rating of structural assemblies whether they are bearing walls, partitions, ceiling, roofs. Check these brochures out. Also are you concerned about the stability of the wall and of the ledger beams in the event of a fire, if so, these can be protected fire resistant material.