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Sway Columns

 
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mc.upadhyay1
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Joined: 26 Jan 2003
Posts: 134

PostPosted: Thu Dec 18, 2003 6:56 am    Post subject: Sway Columns Reply with quote

Hello all
The note in IS 456 at the end of clause 39.7 says
for unbraced columns additional moment should be added to
end moments.
Acc. to SP-24 (page 125 c ) the total moment for unbraced col. should be
the sum of
initial end moment and additional moment, even the col. is bent in
double curvature (as shown in fig E-54).
But the interpretation of the point (b) on the same page, is contradictory
as it says
for unbraced columns bent in double curvature, total moment is equal to sum
of
effective moment and additional moment, because total moment can only be
less than
initial end moment when we take effective moment as 0.6M2 -0.4M1(but it is
done
for braced columns).
Text books also say to add additional moment to initial end moments for
unbraced columns.
So why SP-24 point (b) has added the words in bracket "for braced or
unbraced".



Mukesh Upadhyay

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