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asce 7-05 figure 6-18b
asce 7-05, page 67, figure 8-18b (net pressure coefficient, cn for pitched free roofs) shows load case a & b. what are these cases?
thanks,

hmm..looks to be just the maximum variation in loading due to gusts at different times. it says to check all load cases, so i assume you check case a and case b for each situation. i don't see any text reference to indicate the letters actually correspond to a specific design condition, and don't see anything to indicate you'd use case a this time and case b for some other situation.
i think they are the lower and upper bounds for all possible wind flows or pressures over a pitched roof. this is similar for a house with a gable roof. try calling asce to get the explanation. good luck.

2009-09-07, 01:06 PM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	asce 7-05 figure 6-18b asce 7-05 figure 6-18b asce 7-05, page 67, figure 8-18b (net pressure coefficient, cn for pitched free roofs) shows load case a & b. what are these cases? thanks, hmm..looks to be just the maximum variation in loading due to gusts at different times. it says to check all load cases, so i assume you check case a and case b for each situation. i don't see any text reference to indicate the letters actually correspond to a specific design condition, and don't see anything to indicate you'd use case a this time and case b for some other situation. i think they are the lower and upper bounds for all possible wind flows or pressures over a pitched roof. this is similar for a house with a gable roof. try calling asce to get the explanation. good luck. __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]