Re: dynamic stress analysis .

From: <harish>
Date: Wed Dec 29 2004 - 06:16:00 EST

Dear....gautam wayse
I have two things to say....
first...If u are new to this field....
Then please do some home work.... borrow a Pipe stress Book... Or go back to your college book " Structure of Dynamics".....If u still have some query than ... ua re welcome...

But If u are not new to this field
Than, you shouldn't ask such question.....

• Suman.Banerjee@ril.com wrote:

>
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> response spectra is required to find out the
> frequency of nodal point at
> different time and to analyse that this frequency
> should not be same with
> the natural frequency to avoid resonance.From time
> history response
> spectra is generated. If you get response spectra
> then the analysis will be
> easy and time convenient. Generally we get the
> response spectra of ground
> level.From this depending upon the position
> multilevel response spectra
> have to be generated.It is more correct method.
> In earthquake analysis in nuclear sector there are
> several conditions of
> earthquake such as operating basis earthquake, safe
> shutdown earthquake and
> several class of piping depending upon the safety
> considerations such as
> class one, class two, class three. For all the
> conditions different codes
> are there and from codes we can find out the
> allowable stresses. Generally
> in dynamic analysis the pipes are considered as in
> plastic state,so
> allowable stresses are higher than the allowable
> stress defined in codes in
> static condition.
> calculated stress depends upon the supporting
> criteria and layout.Generally
> in dynamic more rigid supporting arrangement is
> required i.e decreament of
> flexibility....so in thermal case it may create
> problem. For that some
> special supports are there such as snubbers.
>
>
>
>
> gautam wayse <captain_wayse@yahoo.co.in> on
> 12/28/2004 10:24:36 AM
>
> Please respond to <a href="/group/PipingDesign/post?postID=Lez0m59fcLR5qMwBbtlQL7PIpV97dbihZRS16KxK2_2WkeXziZyjRC7n4vEyJLtuWxhYqz_9SKTUrVnUoOVB5mIIpmTYwxc">PipingDesign@yahoogroups.com</a>
>
> To: <a href="/group/PipingDesign/post?postID=Lez0m59fcLR5qMwBbtlQL7PIpV97dbihZRS16KxK2_2WkeXziZyjRC7n4vEyJLtuWxhYqz_9SKTUrVnUoOVB5mIIpmTYwxc">PipingDesign@yahoogroups.com</a>
> cc: (bcc: Suman
> Banerjee/Consultant/JAMNAGAR/RIL)
> Subject: [PipingDesign] dynamic stress analysis .
>
>
>
> dear friend
> if some one working on dynamic analysis and having
> expertise in same .please solve my fallowing
> problems
> .
> why it is essential to perform modal frequency
> response and time histry analysis .
> how much differece (in per cent )one can expect in
> calculated stress
> value at static condition and dynamic cases.
>
> gautam wayse
>
>
>

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