Wind loading to British Standards
Wind loading to British Standards
(OP)
Is anyone out there familiar with wind design to British Standards? I have a cylindrical tank and I want to calculate the overall wind load. The old code (CP3:Ch V) used an overall force coefficient, however the new code (BS 6399 pt 2) does not appear to have this and it is necessary, therefore, to calculate the loading on zones around the tank shell, resolve these in the direction of the wind and add them to give the overall load.
The problem is the CP3 method gives me a result about 50% higher than the BS 6399 method. My questions are:-
Is the method in BS 6399 appropriate for calculating the overall wind load?
Is the CP3 method over-conservative?
Has anybody else experienced the same problem or have I made a mistake somewhere?
Thanks
The problem is the CP3 method gives me a result about 50% higher than the BS 6399 method. My questions are:-
Is the method in BS 6399 appropriate for calculating the overall wind load?
Is the CP3 method over-conservative?
Has anybody else experienced the same problem or have I made a mistake somewhere?
Thanks





RE: Wind loading to British Standards
I am not familiar with the standards you mention. However, BS5400 has formulae, a map of the isles with mean hourly wind speeds, drag coefficients for shape and a table for heights for applied wind load, that will allow you to calculate a wind profile on the structure.
HTH
VOD
RE: Wind loading to British Standards
try www.anemos.co.uk/S-factors.htm
They have a nice calculator to calculate a factor called Sb
Regards
VOD
RE: Wind loading to British Standards
MikePP
RE: Wind loading to British Standards
Generally it seems to give marginally higher values than CP3 - This is disputed by the authors.
Your approach of calculating a vector sum is the same approach that I have used in the past, but I cannot confirm if it is the CORRECT approach.
I degree of conservatism is probably called for!