The architect has handed you floor plates, and you need to figure out whether a moment frame system will work for seismic resistance. The problem? You don’t have member sizes yet. You don’t know the period. And without the period, you can’t pull loads from the response spectrum. Classic chicken-and-egg.
Questions about whether a community centre really needs that post-disaster designation, or how much wiggle room the Authority Having Jurisdiction (AHJ) actually has, come up on many projects. The National Building Code of Canada (NBC) 2020 brought some important clarifications and refinements to Importance Categories, and getting them right is crucial for both safety and project viability. It’s about more than picking a label from a table; you need to understand the intent and the real-world implications for your designs.
I’m Arun Kishore, a Professional Engineer based in Vancouver, BC. I specialize in structural engineering for LNG facilities, civic water infrastructure, and advanced buildings — with a passion for automating the tedious stuff so engineers can focus on what matters.
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