Re: dynamic stress analysis .

From: <Narendra>
Date: Wed Dec 29 2004 - 06:54:00 EST

Good advise. Will all the Piping experts and designers agree to the comments by Harish? Is the solution to the point raised and discussed by others is "Structure of Dynamics" or " Dynamics of Structure", the college book?
I am not able to gauge who is new to piping engg. However, this forum is to lead discussions which are helpful to all, and things were going Ok except this hurting insertion. Cheer up Gautam. Keep raising your doubts and there will be other to give you tips and learn more in return. I was really getting close to the logics of such dynamic analysis.
NK Roy

• harish toki <toki_harish@yahoo.com> wrote:

> 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:
>
> >
> >
> >
> >
> >
> >
> > 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 PipingDesign@yahoogroups.com
> >
> > To: PipingDesign@yahoogroups.com
> > 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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