ASCE7-10 snow drift?
ASCE7-10 snow drift?
(OP)
I have a question regarding snow drift loading in ASCE7-10.
In ASCE7-05 for gable roofs with a width to ridge less than 20 feet, you are required to design for an unbalanced load of IPg. This requirement is repeated in ASCE7-10 but, ASCE7-10 now places an upper limit on the roof slope for the application of unbalanced snow loads of 7:12. How is this limit is to be applied? Is this limit only to be applied to roofs with a width to the ridge greater than 20 feet, or can this limit be applied to all roofs? I believe it applies to all roofs but I am uncertain.
In ASCE7-05 for gable roofs with a width to ridge less than 20 feet, you are required to design for an unbalanced load of IPg. This requirement is repeated in ASCE7-10 but, ASCE7-10 now places an upper limit on the roof slope for the application of unbalanced snow loads of 7:12. How is this limit is to be applied? Is this limit only to be applied to roofs with a width to the ridge greater than 20 feet, or can this limit be applied to all roofs? I believe it applies to all roofs but I am uncertain.






RE: ASCE7-10 snow drift?
RE: ASCE7-10 snow drift?
Thank you for your response.
As far as I can tell, the exclusion has changed from ASCE 7-05 to ASCE 7-10. ASCE 7-05 had a limit of 70 degrees, a 7:12 pitch is equal to a limit of 30.2 degrees.
RE: ASCE7-10 snow drift?
RE: ASCE7-10 snow drift?
RE: ASCE7-10 snow drift?
I have a side question here - the commentary page 431 C7.6.1 first paragraph: "Recent research suggests that the size of this nominally triangular gable roof drift is comparable to a leeward roof step drift with the same fetch."
What is fetch?
EIT
RE: ASCE7-10 snow drift?
hahahahahaha I though I was and idiot because I didn't know what a fetch was either. I was having a conversation with another engineer a few months ago about flood loads on the side of a building. He was talking a good game and used the word fetch.... I had to ask him what it meant and felt like an idiot. I lost that battle but won the war... although he would never admit to it
Sorry about that, here you go the definition of fetch:
fetch: the distance in the direction of the prevailing wind that air or water can travel continuously without obstruction
RE: ASCE7-10 snow drift?
Fetch is also what you do after you throw the ball and your dog decides to ignore you.
RE: ASCE7-10 snow drift?
EIT