Wind Load on Windows
Wind Load on Windows
(OP)
I have to provide the architect with C&C wind loads. Vult=145mph. I know IBC has provisions that allow a 'reduction' in wind loads for checking deflections. I doubt it does, but am looking to see if and similar reductions on window design pressures exist.






RE: Wind Load on Windows
For window wind pressures - use the window area to get an area to use for C&C.
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RE: Wind Load on Windows
RE: Wind Load on Windows
RE: Wind Load on Windows
Ron: Thanks. I have a couple that are 43psf at the corners. The arch tells me once over 40 is the tipping point for drastic increase in window costs. I was hoping to find an out to get to 40, but 43 it shall be.
RE: Wind Load on Windows
I imagine service loads are used for window design.
RE: Wind Load on Windows
RE: Wind Load on Windows
RE: Wind Load on Windows
Windows and other fenestration products are typically tested per ASTM for static, impact and cyclic loading in addition to water and air infiltration tests if required. Typically, a test load is done at 1.5 times the design rating for the product. Skylights are required to be tested to a 2.0 in some jurisdictions. The design rating that is issued on a window will be done in an official document such as Florida Statewide Approval, Miami Dade notice of acceptance, ICC evaluation service report or a Texas Department of Insurance product approval. Most of these documents list the allowable load rating for the system (always check the notes to verify this).
Your loads need to be calculated as ASD loads. If you're using ASCE 7-10, which most of you should be, make sure to use a 0.6W as the calculation of wind load is in terms of LRFD since an "Ultimate wind speed" is used (it's already factored).
Check your local building codes for allowable deflections on glazing support members. Most of you will find a L/175 and some will see L/180 for Miami Dade HVHZ. You're permitted to take your components and cladding wind pressure as .42W for deflections (think 0.6W times 0.7).