Lateral restraints are installed to reduce the buckling length of the web(s), but must be restrained laterally to prevent the webs to which they are attached from buckling together in the same direction.
BCSI-B3, Permanent Restraint/Bracing of Chords and Web Members, provides general industry recommendations and methods for restraining web members against buckling.
Couple the IRC requirements with energy code requirements that are pushing more buildings to utilize a higher heel, and it is apparent the connection of high heels to walls is a key application issue.
The SBC Industry Testing Task Group and the TPI TAC/SBCA E&T Testing Review and Vetting Group has begun to evaluate the needs and priority of testing the performance of assemblies to quantify the effect of heel blocking.
It is clear from the very specific and isolated heel height testing already performed that there is an opportunity to provide revisions to 2009 and 2012 model code blocking requirements to transfer the lateral load resulting from wind and seismic events into braced wall lines.