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#72146 - 09/08/18 11:59 PM Wind load parameters
ccckkkk Offline
Member

Registered: 12/23/08
Posts: 55
Loc: asia

Hi ,

When we select ASCE as the specified wind code and taken into CII calculation , how do we consider the parameter for structure damping coeff. ? CII marked the typical value could be 0.03 ; however, it can't be found that the specified valuces defined in ASCE code , is any reasonable reason to use 0.03 as default value ?

Thanks

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#72151 - 09/10/18 10:02 AM Re: Wind load parameters [Re: ccckkkk]
Dave Diehl Offline

Member

Registered: 12/14/99
Posts: 2349
Loc: Houston, TX, USA
Older documents (USNRC and ASME III) listed piping system damping values of 1% to 3% for seismic use. These sources now show 5% critical damping. In my opinion this change was implemented to better-match actual system performance regarding seismic events.
Usually lower damping will simply increase the applied model load so lower damping may be considered more conservative.
_________________________
Dave Diehl

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#72159 - 09/12/18 04:08 AM Re: Wind load parameters [Re: ccckkkk]
ccckkkk Offline
Member

Registered: 12/23/08
Posts: 55
Loc: asia

Hi Dave ,

Thanks for your reply and I will think it in deep.

Regards,

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