rain loads
rain loads
(OP)
How do you guys design a roof for rain loads? do you use the one day rain fall even if the roof is sloped?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: rain loads
RE: rain loads
Amokhta's reply covers the subject very well. Let me just add that if the roof segment has a slope steeper than 1/4 inch per foot toward points of free drainage, we do not have to check the structural strength of the roof for ponding of rainwater.
The design of the roof drains and piping is based on the rain hourly rate specified by the applicable code. Structurally, we design the roof for the water accumulated considering the deflection of the roof system.
AEF
RE: rain loads
RE: rain loads
RE: rain loads
I agree in 2" of water downstream be very much nice a load. Where I live it rains scarcely (220 mm a year) and you would be annoyed of the general miscare with which these things are...NOT made. Furthermore there are the inner patios where to produce the spill-over would mean plumbing, yes, this even less done than what other.
Fortunately the total load HERE is unlikely to go as high as to extenuate the structure and in fact these failures here are mostly unseen. Underpass or cellar flooding is more common.
By the way I had 20 years ago the opportunity to load with 20 cm of water a RC 25 or 30 cm deep beams/25 or 30 cm deep RC joists (half) roof in a condominium in construction and the structure made to the spanish code EH-80 passed the test without any noticeable movement.