Another code cycle, another round of changes to get our heads around. Just when you think you’ve got your spreadsheets perfected, the new National Building Code of Canada (NBCC) lands on your desk. While the 2020 edition brought updates across the board, the wind load provisions in Subsection 4.1.7. have some particularly noteworthy changes that are already impacting our designs.
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When a new set of professional practice guidelines drops, our first thought isn’t always, “Great, more reading!” But when it comes to retaining walls in British Columbia, ignoring the rulebook isn’t an option. These aren’t just gentle suggestions; they are the standard of practice we, as Registrants of Engineers and Geoscientists BC, are required to have regard for.
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Let’s be honest, NBCC Part 4 can be dense. When you get to wind loads in Section 4.1.7, it’s a flurry of equations, factors, and tables. You know the rules are in there, but what about the ‘why’? Why is the gust factor 2.0 for the main system but 2.5 for cladding? When do you really need to jump from the Static to the Dynamic Procedure?
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If you’re a structural engineer in Canada, you’ve stared at this equation more times than you can count:
$$S = I_s[S_s(C_b C_w C_s C_a) + S_r]$$It’s the backbone of our snow load calculations, a formula we trust to keep our buildings standing through the harshest Canadian winters. It’s important to remember this detailed formula is from NBCC Part 4; the approach for simpler structures is different, as we’ve covered in our guide to wind and snow loads in Part 4 vs. Part 9.
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Here we go again. The first heavy, wet snow of the season is plastering everything in sight, and you get that familiar call from an architect. “We’re looking at a large, flat roof on this new project. What kind of snow load do we need?”
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Solar panels, architectural sunshades, and complex multi-level rooflines are no longer the exception; they’re the norm in modern Canadian building design. While they score points for energy efficiency and visual appeal, they also create a minefield of unexpected snow and ice loads for structural engineers.
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We’ve all been there. It’s late, you’re deep into a design, and you’re staring at the National Building Code, wondering if you’ve caught every little detail. The NBCC is a dense document, and its companion, the Structural Commentaries, is packed with the “why” behind the rules. It’s in those commentaries that we find the nuances that can make or break a design, or at least save us a headache during a plan check.
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Welcome to my structural engineering blog! I’m Arun Kishore, a Structural Engineer based in Vancouver, BC, Canada. This blog is a space where I plan to document my continuous learning journey, share insights, and discuss the diverse world of structural engineering – from codes and standards to design procedures, innovative ideas, and material-specific topics.
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