Martin.H
Structural
- May 19, 2021
- 40
Does anyone have any input / reference on what the pressure coefficients would be for a free-standing wall that is close to, and adjoins, a larger building (like the picture below).
My case is an open-topped temporary construction hoarding to a shop-front (say protruding max 1.5m from building line). Assume the shopfront is intact and so not porous.
I'm familiar with pressure coefficients for freestanding walls (and how they vary with end conditions and distance from ends). I've seen literature allude to the fact that a hoarding like I'm describing will act as an extension of the building and thus see similar pressure coefficients to the building's walls (Cp = -0.7 / + 0.8 for the codes I use). Presumably this is referring to external pressures coefficients, but should these be additive to an 'internal' pressure within the hoarding (even if the hoarding is open top)?
The hoarding acting as an extension of the building makes some sense to me on the basis that the larger building will stall windward gusts somewhat and provide shelter from leeward winds.
BS8579 contains advice on pressure coefficients for solid balcony walls/balustrades, which is perhaps the most comparable scenario I can find, giving a value of Cp =1.5 for locations not near corners or the top floor. I can't help but think a ground level structure would have lower values, perhaps more analogous to Zone D of a freestanding wall, i.e. Cp = 1.2.
Just in case anyone is interested, the BS85979 values comes from the "Wind Loading Handbook for Australia & New Zealand - Background to AS/NZS 1170.2 Wind Actions"
If anyone with CFD ability want's to collaborate on some research I have many more similar queries that aren't covered by codes!
My case is an open-topped temporary construction hoarding to a shop-front (say protruding max 1.5m from building line). Assume the shopfront is intact and so not porous.
I'm familiar with pressure coefficients for freestanding walls (and how they vary with end conditions and distance from ends). I've seen literature allude to the fact that a hoarding like I'm describing will act as an extension of the building and thus see similar pressure coefficients to the building's walls (Cp = -0.7 / + 0.8 for the codes I use). Presumably this is referring to external pressures coefficients, but should these be additive to an 'internal' pressure within the hoarding (even if the hoarding is open top)?
The hoarding acting as an extension of the building makes some sense to me on the basis that the larger building will stall windward gusts somewhat and provide shelter from leeward winds.
BS8579 contains advice on pressure coefficients for solid balcony walls/balustrades, which is perhaps the most comparable scenario I can find, giving a value of Cp =1.5 for locations not near corners or the top floor. I can't help but think a ground level structure would have lower values, perhaps more analogous to Zone D of a freestanding wall, i.e. Cp = 1.2.
Just in case anyone is interested, the BS85979 values comes from the "Wind Loading Handbook for Australia & New Zealand - Background to AS/NZS 1170.2 Wind Actions"
If anyone with CFD ability want's to collaborate on some research I have many more similar queries that aren't covered by codes!
