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# Dynamic wind load on high-rise building having unsymmetrical floor plan

## Dynamic wind load on high-rise building having unsymmetrical floor plan

(OP)
I am working on a high-rise building project with 200m tall; floor plan has half-circle shape with diameter = 40m.
In some codes, only high-rise building with rectangular plan is mentioned.
Could anyone tell me the way to calculate along-wind force and across-wind force for that building.
Thanks.

### RE: Dynamic wind load on high-rise building having unsymmetrical floor plan

It's my understanding that for buildings of that scale (height), wind loads are more commonly derived from wind tunnel model testing (or maybe CFD now), not prescriptive use of the codes.

### RE: Dynamic wind load on high-rise building having unsymmetrical floor plan

(OP)
Dear Lomarandil,

Thank you. Yes, I also think that the tunnel test is needed. However, I want to do that calculation first before going to the test.
Moreover, I would like to know the way to calculate wind force for that floor plan shape with any height of building.

### RE: Dynamic wind load on high-rise building having unsymmetrical floor plan

I'm sure you could approximate some results by varying the Cd or Cf factor (drag coefficient) for various orientations.

I'm sure there are tabulated values for a semicircle geometry out there, but you might have to look into some fluid mechanics resources rather than structural engineering ones.

### RE: Dynamic wind load on high-rise building having unsymmetrical floor plan

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