Tributary are of a window with a semicircular top.
Tributary are of a window with a semicircular top.
(OP)
I could use some help resolving the tributary area of a 48" wide window that is 126" in height. If the window were rectangular I would not have a problem but the top of window is a semicircle. Any help would be appreciated as I am determining the anchor locations at the window frame to the framing.
I did a crude sketch of the window and want to know if I have the tributary area of the semicircle correct.
Thanks
Vinny
I did a crude sketch of the window and want to know if I have the tributary area of the semicircle correct.
Thanks
Vinny






RE: Tributary are of a window with a semicircular top.
Your perimeter is 27.28 ft.
Your question is confusing. If you are considering fastener loading, the tributary area is for 1 fastener, so the maximum coefficients apply.
Please clarify your question and why you need to separate the tributary area of the arch from the remainder.
RE: Tributary are of a window with a semicircular top.
RE: Tributary are of a window with a semicircular top.
RE: Tributary are of a window with a semicircular top.
RE: Tributary are of a window with a semicircular top.
By the way, I typically use a safety factor of 4 for component and cladding fasteners in direct tension.
The distribution you are trying to apply is more applicable to the glass than to the frame. The load is applied to the glass by the wind, which in turn is transmitted to the frame by shear at the edge of the glass. To try to evaluate small variations in the stress distribution in the class is a waste of time.
RE: Tributary are of a window with a semicircular top.
So, you propose that I take the entire area of the window and multiply it by the factored pressure, take that load and add safety factor of 400% then take the load and divide it by the permiter to determine the loading per inch. Then size my anchors and clip assemblies appropriately?
I will use the square approach and use 42 SF as the area. The windload used in this example is 30 PSF and the safety factor is 4. Thereforer the loading from the entire window is 5,040 lbs. Using the permiter of 31.28-feet. The loading of about 161 lb/ft of the window frame.
Would that be the way that you safely compute the loads at the ourside of the window?
Thanks
Vinny
RE: Tributary are of a window with a semicircular top.
That way, it will be apparent to whomever reviews, that your are applying the factor of safety to the resistance, not to the load. If you are using manufacturer's fastener pullout tables, make sure they are given in ultimate load, not allowable load. If allowable load, you don't have to apply the FS=4, but it would be a good idea to determine if their factor of safety is 4.
RE: Tributary are of a window with a semicircular top.
Maintain the same spacing around the curve, i.e. s.
BA
RE: Tributary are of a window with a semicircular top.