Steel Joist Girder Connection at Existing Tilt Panel Wall
Steel Joist Girder Connection at Existing Tilt Panel Wall
(OP)
I have a situation where a joist girder sits on a WT that is welded to embed on an existing tilt panel wall. Does the embed take only shear? My senior engineer says since everything is attached, the deck, the joist are in place the connection will only take shear. I feel that the joist girder load will cause an eccentric load on the WT and therefore induce moment on the embed. We are planning to increase the capacity of the floor deck for the building and the general loading will increase by 10 psf. If I account for eccentric load the existing embed fails. If the connection is pure shear it is ok. If I need to design for moment, how should I tackle the problem?






RE: Steel Joist Girder Connection at Existing Tilt Panel Wall
Usually the weld from the seat to the WT isn't enough to deal with the moment there.
Either there is moment in the joist girder seat/WT assembly or there is moment on the WT-to-wall connection.
You can't ignore both.
RE: Steel Joist Girder Connection at Existing Tilt Panel Wall
RE: Steel Joist Girder Connection at Existing Tilt Panel Wall
Dont ignore load that is there. If you boss insists you do, find a new boss.
now, have you checked to see if there is any live load reduction you can take, that was not taken before?
RE: Steel Joist Girder Connection at Existing Tilt Panel Wall
This is so rare that many codes make it illegal. In NZ3404 you MUST include a nominal eccentricity.
If you are in seismic zone, this argument is moot as well.
If you see high winds, I'd never consider this argument.
Effectively this is an abuse of St. Venant's principle. Local effects and Global effects at least INTERACT in almost every situation.
Don't design this to be dependent on no e, you'll be in for trouble IMHO.
RE: Steel Joist Girder Connection at Existing Tilt Panel Wall
RE: Steel Joist Girder Connection at Existing Tilt Panel Wall
The building is a non seismic 90 mph wind zone. It was built in 2009. The concrete and studs are fine, I am more concerned about the thickness of the embed. How can I increase the thickness of the embed? I don't think it is possible.
RE: Steel Joist Girder Connection at Existing Tilt Panel Wall
RE: Steel Joist Girder Connection at Existing Tilt Panel Wall
RE: Steel Joist Girder Connection at Existing Tilt Panel Wall