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[desai_nsu]

Dear all,

I have the following comments on the Proposed Revisions to IS:13920

1) Title of the code is "Code of practice for ductile detailing of
reinforced concrete structures subjected to seismic forces".
But the code is not limited to detailing alone. There are many
design aspects covered by the code,  like, calculation of design
shear force, strong column weak beam concept etc,.
It may be more appropriate to have the title as "Code of practice
for ductile design and detailing of reinforced concrete structures
subjected to seismic forces".
As
Ah  Bs          Bh
2) Clause 6.3.3 stipulates that the values of Mu, Mu, Mu  and Mu are
to be calculated as per    IS:456-2000. ANNEX G of IS:456-2000 is
useful for design of doubly reinforced section whereas the
requirement under clause 6.3.3 of IS:13920 is calculation of moment
of resistance of a given doubly  reinforced section.

The computational procedure to be followed to find the value of
moment
of resistance of doubly   reinforced section may be included in
IS:13920 as an annexure which will help all the structural Engineers
and ensure uniformity.

Computations being  iterative in nature, suitable design aids in the
form
of moment of resistance factors will be a good alternative.

R.K.Desai

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