Return Period for Wind Loading
4

Question

Return Period for Wind Loading

dik (Structural)

(OP)

13 Feb 20 19:14

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?

Thanks in advance,

Dik

RPMG (Structural) · Answer 1 · 2020-02-13 19:29:00

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

phamENG (Structural) · Answer 2 · 2020-02-13 19:40:07

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.

dik (Structural) · Answer 3 · 2020-02-13 22:23:21

RE: Return Period for Wind Loading

dik (Structural)

(OP)

13 Feb 20 22:23

Thanks, gentlemen...

Dik

retired13 (Civil/Environmental) · Answer 4 · 2020-02-13 22:31:17

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

skeletron (Structural) · Answer 5 · 2020-02-14 02:01:45

@Dik: Page C-9 of Appendix C for the BCBC 2018. Which I believe should be the same page of NBCC. Aw heck, see the attached snip.

https://files.engineering.com/getfile.aspx?folder=48fdb30f-4f3a-4609-b18a-9

sbisteel (Structural) · Answer 6 · 2020-02-14 02:45:58

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

dik (Structural) · Answer 7 · 2020-02-14 03:00:17

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

dik (Structural) · Answer 8 · 2020-02-14 03:01:28

sbisteel:

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

Dik

dik (Structural) · Answer 9 · 2020-02-14 03:27:09

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

Answer 10

[Post Deleted]

skeletron (Structural) · Answer 11 · 2020-02-14 05:44:43

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

dik (Structural) · Answer 12 · 2020-02-14 14:29:36

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

Trenno (Structural) · Answer 13 · 2020-02-16 12:49:49

This thread may be of assistance:

https://www.eng-tips.com/viewthread.cfm?qid=435230

Come Join Us!

Posting Guidelines

Related Projects

Jobs

Return Period for Wind Loading
4