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Adujsted Values of R for IS Codes... Reliable or Conservativ

 
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vmscons
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 16

PostPosted: Fri Aug 20, 2004 11:06 am    Post subject: Adujsted Values of R for IS Codes... Reliable or Conservativ Reply with quote

Dear Dr. Jaiswal and Dr. Jain,

Response Reduction (Modification !) factors have major contribution
on decision of level of seismic force to be considered for different
structural systems..

Major seismic codes have some difference in arriving at a suitable
design seismic coefficient values as compared to IS 1893 (Part - I):
2002.

Do the values of R in present IS 1893 Part - I, and those proposed under
IITK - GSDMA project match( w.r.t. ratio of R for various systems as compared
to most ductile frames ) with those of IBC / FEMA ? Or while deciding
on such an important parameters, did the commitee consider any relative
structural system defined in IBC / FEMA , and adjust the R values for
IS 1893 (Part - I) : 2002 based on the ratio therein ???

Why do not we have structural reliability factors, overstrength factors along
with RESPONSE REDUCTION FACTORS to have a more realistic view of
the suitability of the level of design seismic forces for which we design our
structures ......

As justified by JAISWAL, JAIN and RAI in their review document for tanks,
we should design all structures on relative basis to IBC or FEMA or other
such major seismic codes..


With Best Regards,
Rushikesh Trivedi
VMS Engineering and Design Services (P). Ltd.
Ahmedabad

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