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Canopy atop Freestanding wall

Canopy atop Freestanding wall

Canopy atop Freestanding wall

(OP)
Hello,

I am designing a canopy which is on top of a steel column. I am using ASCE07-10 to calculate loads. I am stuck at wind loads for this geometry. Although this is a freestanding wall, this also qualifies as lattice framework and trussed towers. I was designing it as a lattice framework but on doing some research I came across some articles calling this a trussed tower. I am not sure in which category this structure should go. Any opinions?

Thanks.

RE: Canopy atop Freestanding wall

I think a sketch or photo would help.

RE: Canopy atop Freestanding wall

Without looking at it.....if we are just talking designing the canopy and the members that directly support it....I'd probably use the lattice approach (i.e. loading individual members). Usually for small structures this is the approach. The trussed tower approach is where you have a number of members where loading each one would be too cumbersome.

Also keep in mind: even for a open canopy.....you will have uplift and down loads for it. IIRC ASCE 7-10 (and later) covers that.

RE: Canopy atop Freestanding wall

Quote:

I have calculated down loads and wind loads on canopy using lattice framework but for uplift should I apply wind load at column?

I'd apply it over all the cover. See Figures 27.4-4 & 27.4-7 in ASCE 7-10.

RE: Canopy atop Freestanding wall

(OP)
But would that not be designing the structure as 27.4.3 Open Buildings with Monoslope, Pitched, or Troughed Free Roofs and not as 29.5 The design wind force for other structures (chimneys, tanks, rooftop equipment for h > 60°, and similar structures, open signs, lattice frameworks)

RE: Canopy atop Freestanding wall

That looks more like an open building - even with a partially open "roof" you'd still have the potential of someone covering it someday or the wind drag on any lattice, partially open membrane, or grid would be almost as much as a solid cover.

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RE: Canopy atop Freestanding wall

Quote:

But would that not be designing the structure as 27.4.3 Open Buildings with Monoslope, Pitched, or Troughed Free Roofs and not as 29.5 The design wind force for other structures (chimneys, tanks, rooftop equipment for h > 60°,....

For the uplift/down MWFRS loads on the roof? That's the idea. For the support members (i.e. columns, etc)....I think the lattice method would be appropriate.

RE: Canopy atop Freestanding wall

(OP)
Got it. Thank You

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