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(OP)
Does anyone have a quick method or adjusting the wind load based on a return period less than that of the normal 30 year, 50 year or 100 year durations?

Dik

I thought it was 1.0 for 100 year and 0.7 for 10 year.

ASCE 7 Commentary for Chapter 26 goes into return period comparisons in their explanation of the change from 50 year in 2005 to the 300, 1700, etc. in 2010.

(OP)
Thanks, gentlemen...

Dik

A search on the web I found this, Link. I think you can find similar record for the local that you are interested in.

ASCE37-14 has wind speed modification factors for return periods under 5 years.

(OP)
skeletron:

Thanks very much, I think that was the formula I had seen or one of the same form. I'll check the NBC tonight.

Dik

(OP)
sbisteel:

Thanks to you also... I'll try to dig up a copy and see what it says.

Dik

(OP)
sbisteel:
Found a copy... it has the info I can use. Thanks.

skeletron:
I've coded the formula into SMath and will play with it this evening.

Thanks, gentlemen

Dik

Just an FYI @dik: V is in m/s. They define q = 0.00064645 V2 in the previous page. q is in kPa.

(OP)
Thanks skeletron, that was my next step... I work in both SI and Imperial, but think in Imperial... just too old. I'll post the SMath program when completed... have some real work to do now...

Dik

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