Metal plate connected gable end frames are widely used above the end walls of a building to save the contractor the time and expense of having to field frame the end wall to match the roof slope. The gable end frame is an integral structural element of the gable end wall assembly and must be incorporated into the overall wall and building design in order to properly transfer loads to the foundation.
Most gable end frames are designed to have continuous support along their entire span and are referred to by the industry as a non-structural gable end frame. The non-structural gable end frames are designed to receive vertical loads (i.e., gravity and/or uplift) applied within the plane of the frame and to transfer these loads to the continuous bearing below. During normal non-wind loading, this is a reasonable presumption.
However, in service, gable end frames also experience lateral loads applied both parallel and perpendicular to their plane from wind and/or seismic events, as well as the possible accumulation of buckling forces of truss web members. Gable end frames are typically not designed to resist these loads. In order to support and transfer lateral loads to the permanent building stability bracing, properly designed and installed structural sheathing, lateral restraint, diagonal bracing, and related connections are required."
This topic is very conveniently overlooked in almost all wind mit training materials, yet we are expected to verify if gable end walls are braced I.A.W. 2001 FBC.
Also, I have never seen it discussed on this MB.
In reality, only the structural designer can take into account all of the variables and come up with the prescriptive design req’ts to meet 2001 FBC.
Is it possible for a gable end wall designed in 2000 to meet the bracing req’ts of the 2001 FBC? Yes.
Is it required? No.
Therefore, wind mit inspectors are pretty much forced into answering Q6, Gable End Bracing, as “B. Does not meet…” for all permit apps submitted B4 March 1, 2002.
Q6, when analyzed as above, does not even belong on the Form!