puszka
Civil/Environmental
- Jul 12, 2022
- 30
Hi y'all
New EIT here. I'm working on my first open canopy structure which I am trying to analyze based on the Ontario Building Code (based on NBCC). It's just a 5m x 5m (16' x 16') cantilevered umbrella and I'm designing the footing.
I have worked on a project with an overhang before and I ran into a similar problem -- I can't find any reference to overhangs, canopies, or open structures in our code save for 4.1.7.7 which stipulates an internal pressure coefficient for buildings with large openings (to remain open in inclement weather). I could simply use the static method to find the wind load on what is essentially a hipped roof and consider the open building internal pressures for the load on the underside.
My intuition is telling me that an umbrella like this will experience it's worst moment if there is a momentary downburst of wind, which seems possible but there is nothing codified for this condition. Since it is also a wonky umbrella that can pivot somewhat around it's single attachment point right at the peak, it also seems unreflective of the real world situation to just consider the pitch of the umbrella as equivalent to a rigid free-standing roof.
Any insights and procedural advice is very welcome on this one.
Thanks everyone
New EIT here. I'm working on my first open canopy structure which I am trying to analyze based on the Ontario Building Code (based on NBCC). It's just a 5m x 5m (16' x 16') cantilevered umbrella and I'm designing the footing.
I have worked on a project with an overhang before and I ran into a similar problem -- I can't find any reference to overhangs, canopies, or open structures in our code save for 4.1.7.7 which stipulates an internal pressure coefficient for buildings with large openings (to remain open in inclement weather). I could simply use the static method to find the wind load on what is essentially a hipped roof and consider the open building internal pressures for the load on the underside.
My intuition is telling me that an umbrella like this will experience it's worst moment if there is a momentary downburst of wind, which seems possible but there is nothing codified for this condition. Since it is also a wonky umbrella that can pivot somewhat around it's single attachment point right at the peak, it also seems unreflective of the real world situation to just consider the pitch of the umbrella as equivalent to a rigid free-standing roof.
Any insights and procedural advice is very welcome on this one.
Thanks everyone
