Now I have same question as Mr. Giammarco Negrini for applying a static seismic g-factor.
I generally have used UBC94 Section 1630 , equation(30-1) for the piping component. However UBC97 changed this equation as UBC Section 1632, equation(32-2). Also, I am very confused since new Code seismic force is jumped to twice than old one.
The major differences between UBC97 and UBC94 are as follows ;

-Static equivalent g-factor is approximately twice than old Code for same seismic zone with hx/hr=1.
-UBC 97 add the Load combinations using allowable stress design.
-The load combinations using strength design is changed with less seismic load multiply factor, for instance ; UBC97 Section 1612.2.1, equation(12-6).

I think the piping stress engineer should use UBC97, equation(32-2) with individual piping support location on structure. Also, I suspect that new Code seismic load factor is suddenly twice than before is due to some different conception in load combination.
Please let me know the basis why Mr.Richard Ay recommend that UBC Section 1634.5 can be applied for piping component as seismic force calculation. Also, I would like to confirm which equation is applicable for piping components.

Soon Ryang, WEE


Posted by Giammarco Negrini on November 16, 1999 at 17:29:58:

:I need to know what section of UBC'97 concerns piping.
:I suppose Section 1632, but I need a confirmation.

:Many thanks in advance.


Posted by Richard Ay on November 16, 1999 at 17:48:37:

:In Reply to: UBC code section for piping analysis posted by Giammarco Negrini on
November 16, 1999 at 17:29:58:

:I would use 1634.5 for piping systems.

:Regards,
:Richard Ay (COADE, Inc.)


Posted by Giammarco Negrini

: I need to know what section of UBC'97 should be used
: to define seismic forces acting on piping system.
: I generally refer to section 1632 formula (32-2)
: assuming (hx/hr)=1.

: Many thank for Your comments.

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[This message has been edited by Soon Ryang, WEE (edited December 21, 1999).]

[This message has been edited by Soon Ryang, WEE (edited December 21, 1999).]

[This message has been edited by Soon Ryang, WEE (edited December 21, 1999).]