There is a note on page 39 of AS1170.2 2011 pertaining to local pressure factors that says "The side ratio of any local pressure factor area on the roof shall not exceed 4". This was not included in the earlier edition of the code. Previously, as far as I know, you would apply small localised high pressure areas, either (a x a) or (a/2 x a/2), along the length of the purlin, and it would be these areas that we would apply the local pressure factor k[l].
What are the implications of the above note in the more recently published code? Do we now also consider an area of (a x a/4) when designing purlins?
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