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Wind Force

 
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gpsarathyy
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Joined: 28 Jun 2010
Posts: 486
Location: chennai

PostPosted: Mon Feb 24, 2020 5:04 am    Post subject: Wind Force Reply with quote

Dear Sefians,

Is there any conversion formula / equation available for converting 3 sec gust wind to 1 minute gust, 10 minute gust, 1 hour gust etc.,

Any international codes covers this conversion equation?
If available, kindly share the info.

_________________
G.PARTHASARATHY M.E. CEng(UK), MICE., MIE.,
CHENNAI
GPSARATHYY@GMAIL.COM
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Dr. N. Subramanian
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Joined: 21 Feb 2008
Posts: 5364
Location: Gaithersburg, MD, U.S.A.

PostPosted: Mon Feb 24, 2020 10:51 pm    Post subject: Re: Wind Force Reply with quote

Dear Er Parthasarathy

Please see my Steel Design book pp.101-102.

Best wishes
Subramanian
gpsarathyy wrote:
Dear Sefians,

Is there any conversion formula / equation available for converting 3 sec gust wind to 1 minute gust, 10 minute gust, 1 hour gust etc.,

Any international codes covers this conversion equation?
If available, kindly share the info.
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jdbuch
SEFI Member
SEFI Member


Joined: 24 May 2008
Posts: 16

PostPosted: Tue Feb 25, 2020 12:30 pm    Post subject: Reply to query by Parthasarathy on 24-2-20 Reply with quote

Dear Shri Parthasarathy,Regarding your query of conversion of 3-sec gust speed to other t-seconds values, I attach pp 42-43 of my book 'High-rise Buildings .Earlier in the US, it was considered reasonable to use wind mean speed averaged over one hour for assessing along-wind response of tall buildings. Later in 1995 (and further updated in 1998), Wind Maps of US were revised on the concept of 3-sec gust speeds. This change was incorporated in ASCE 7-98. In the commentary of this code, adjustment of hourly mean speed or fastest mile with that at different time period are given in Fig C6-1 (on page 268). Once you read the attachment, the above will become self-explanatory.I referred to ASCE 7-98 as it was current at the time of publishing the book. Once you read the attachment, the above will become self-explanatory and trust that it replies to your queryI have no access to later revisions of ASCE 7-98 (The present one is probably 2014) or further research on these conversions. Probably Dr. NS may be able to advise you on this.RegardsJ.D.Buch

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rajancivildesign@gmail.co
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Joined: 26 Jan 2011
Posts: 558

PostPosted: Wed Mar 04, 2020 4:20 pm    Post subject: Wind load calculation as per Gust factor method Reply with quote

Dear SAFIANS,
I have worked out wind load for a ten storeyed  rcc building as per IS 875 part 3-2015  using  static method. For working out for same building  by Gust factor method, it is difficult to work out for dynamic analysis.
I  herewith attached my calculation for static method. Can anyone who conversant with Gust factor method as per IS 875 part 3-2015  will  work out and compare the results with static method.
V.M.RAJAN



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gpsarathyy
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Joined: 28 Jun 2010
Posts: 486
Location: chennai

PostPosted: Tue Mar 10, 2020 6:04 am    Post subject: Reply with quote

Thanks NS sir and Buch Sir. For addressing my query - was useful.



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