CANOPY WIND LOAD FORCE COEFFICIENT - HI RISE BUILDING

[PT99]

I am designing a ground floor entrance canopy using ASCE 7-05 (NYC BC) for a building with a 125 height

Fig 6-3 (Page 44) has a table for roof overhangs, but for up to 60 ft building height. Can I consider my ground floor canopy as a roof overhang, and use this table.

Or, what is the Cf (Force coefficient) for a canopy and not using this table, and then calculate qz.

 

[phamENG]

There has been a lot of research into this in the last 15 years. Though it may not be referenced in your code, I strongly suggest you take a look at the provisions in ASCE 7-16 for canopies attached to the face of a building. I haven't dealt with the plan reviewers in NYC, but I've been told they are fairly competent. They'd likely understand and let you use the "accepted practices" clause in the code to use a newer edition.

If you insist on using only the very limited provisions of 7-05, you could look at it as an open structure with obstructed wind flow. The problem here is that it will probably overestimate uplift and underestimate the downward wind force caused by wind deflecting down the face of the building.