jdgengineer
Structural
- Dec 1, 2011
- 748
We are working on a project which will have a roughly 15' x 15' fabric shade sail over a patio area. The sail will be supported by the building structure on 3 sides and a steel column on the 4th side.
I know the anchorage forces can be quite high on these due to the pretension on the shade coupled with the wind uplift.
How have you all designed these small structures in the past? Given its a single family residence I won't be receiving any anchorage forces from the fabric engineer.
If I designed for 10 PSF uplift (need to confirm loading just ballpark idea) x 225 SF = 2,250 / 4 anchorage points = 562.5#. If I assume the sail angle is 10° at this loading I get a horizontal reaction of 3,300#. This assumes uniform loading and a made up angle both of which are probably not entirely accurate. We are in low wind area (90 mph)
Does this seem reasonable? How are these typically designed?
I know the anchorage forces can be quite high on these due to the pretension on the shade coupled with the wind uplift.
How have you all designed these small structures in the past? Given its a single family residence I won't be receiving any anchorage forces from the fabric engineer.
If I designed for 10 PSF uplift (need to confirm loading just ballpark idea) x 225 SF = 2,250 / 4 anchorage points = 562.5#. If I assume the sail angle is 10° at this loading I get a horizontal reaction of 3,300#. This assumes uniform loading and a made up angle both of which are probably not entirely accurate. We are in low wind area (90 mph)
Does this seem reasonable? How are these typically designed?
