Wind loads, return periods and averaging time, Conversions?
Wind loads, return periods and averaging time, Conversions?
(OP)
Pals
Can anyone help me determine a 50year wind from a 10year wind?
Does averaging time used in determining wind velocities matter much? I mean while ASCE uses 3 second, will that be VERY different if it were 10minutes?
Respects
IJR
Can anyone help me determine a 50year wind from a 10year wind?
Does averaging time used in determining wind velocities matter much? I mean while ASCE uses 3 second, will that be VERY different if it were 10minutes?
Respects
IJR





RE: Wind loads, return periods and averaging time, Conversions?
ASCE 7 provides tables for converting 50-year winds given in the document to other return periods. I assume that can work backwards.
Curious, why would you want to do this? Did someone give you 10-year winds and ask you to design for 50-year based on that information?
RE: Wind loads, return periods and averaging time, Conversions?
And another example. In Russia they use 5-year winds, and if you have to use any US code, you have to go back and get a 50year equivalent.
Respects
IJR
RE: Wind loads, return periods and averaging time, Conversions?
RE: Wind loads, return periods and averaging time, Conversions?
AISC? let me have a look at that. What AISC? The steel code?
ASCE says you multiply 50yr wind speed by a factor for a duration Tr. This is in table C6-7. This table makes sense because factor for Tr=50 is 1.00.
In that table factor for Tr=10years is 0.84.
I take that to mean I can factor down the 50yr wind speed to 0.8V where V is the 50year wind speed as given in that code
Am I right here?
respects
IJR
RE: Wind loads, return periods and averaging time, Conversions?
RE: Wind loads, return periods and averaging time, Conversions?
you friends are always great.
RE: Wind loads, return periods and averaging time, Conversions?
RE: Wind loads, return periods and averaging time, Conversions?
I have got that. I once blindly factored wind pressures by 0.7 while calculating wind induced deflections which I was told should be based on 10yr not 50yr wind.
Now I fully know why
My next concern would be when use of lower return periods are warranted.
respects
IJR
RE: Wind loads, return periods and averaging time, Conversions?
RE: Wind loads, return periods and averaging time, Conversions?