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Engineers urge limits on prescriptive IRC methods for three‑story multiplexes; suggest engineered design in higher seismic areas
Summary
TAG engineers flagged seismic performance concerns for three‑story multiplexes if the IRC's prescriptive braced‑wall and stud‑size provisions are used without engineering, urging that projects in higher seismic categories or atypical layouts be engineered to IBC standards.
Technical advisory group members debated whether three‑story multiplex buildings should be allowed to use the IRC prescriptive lateral systems (braced wall panels and other prescriptive methods) or whether projects should require an engineering design under the IBC for certain seismic zones or building configurations.
Engineers on the TAG said gravity (vertical) loading on stud walls is generally manageable, but seismic demands—particularly overturning and complex lateral load paths—raise concerns…
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