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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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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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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Canadian projects see everything from heavy snowfalls to strong winds, so our designs constantly have to stand up to the elements. The National Building Code of Canada (NBCC) gives us the rulebook, but how we apply those rules can differ significantly, especially when we’re talking about Part 4 (Structural Design) versus Part 9 (Housing and Small Buildings).
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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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