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[seelam96ce22]

 Dear sir/ madam ,
 
                  It is good to have discussion session on IS :16700-2017 , the following are my queries, requesting  Draft team  and other members  to share views  /  give clarity .

1.            Clause 1.6 of IS:16700  will state that “ in case of conflict , clauses given this standard shall be applicable “,   the following are the conflict with IS 1893-2016

A.       Damping ratio of concrete as per  clause 6.2.24 of IS :16700 is 2% whereas it is 5% as per 7.2.4 of IS :1893,  is this reduction of damping ratio’s having any relations with building heights.
 
B.        Lateral Drift ratio for factored load combinations limited to  H i/250 in  clause  5.4  of IS :16700  whereas  the same drift limits in Is :1893 clause7.11.1  is w.r.t service load combination with  factored  cracked section prosperities .
Apart from that  this  drift ratios are not specified w.r.t  structural system in IS:16700  , shall we follow H/250   irrespective of structural system  if no  irregularities.
              
2.    Structural system  vs  Height limitations
Can we get the clarifications for treating  the following systems as secondary /  low-grade or   treating as  equal in lateral load resisting systems     w.r.t  other  systems   


a. Structural walls with moment frames  w.r.t  structural walls located at core
b. Well distributed walls  w.r.t   to Structural walls with perimeter systems
c. Structural walls with Moment frames w.r.t  Structural walls with perimeter frames . is  perimeter frames indicates nominal frames or  deep beams.



with regards,
prasad           

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