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E-conference on IS:800 Draft (LSM)

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SEFI Member
SEFI Member

Joined: 26 Jan 2003
Posts: 7

PostPosted: Tue Oct 07, 2003 4:03 pm    Post subject: E-conference on IS:800 Draft (LSM) Reply with quote

Dear Structural Engineers,

I would like to write the following observations on the draft code which
may be considered by the code committee:

1. Clause in page 28 may be reworded as follows:

“Where the Limit State Method cannot be conveniently adopted, Working
Stress Method (Section 11) shall be used.

2. The Partial Safety Factor of 1.05 for load cases with crane (CL),
given in Table 5.1 in page 48, is very small indeed.  This may be a
typographical error. In industrial type structures, dead and live loads
on roof etc. are usually very small, and crane loads combined with wind
load are critical in the structural design in most cases.  This Partial
Safety Factor needs to be revised to 1.5.

3. In Table 5.3 in page 51, the types of cladding mentioned need to be
defined, particularly with reference to the types of cladding used in

4. The figures shown in page 70 for the lacing details of columns are
inadequate.  The code should show all the figures (Figs. 4A to 4D) given
in the National Building Code of India 1983, Group 2, Part VI Section 6
Structural Steel , for more clarity.

5. Section 10 deals with connections between steel sections only.
Clause G.5.2. in pages 197 and 198 on holding down bolts is also very
sketchy.  These do not deal with various types connections of steel
sections to concrete, such as with expanding type bolts and insert
plates with anchors, which are used in large numbers in industrial type
structures.  In most design offices, usually two separate groups operate
for  the design  of steel  and concrete  structures.     This practice
has become
more universal.  The steel designer considers only the strength of steel
while designing the end details of steel members and usually does not
bother about the strength of the concrete to resist the end loads.  The
concrete designer designs the supporting concrete members only for the
loads furnished by the steel designer, usually  not verifying the design
of steel end details given by the steel designer.  In these
circumstances, sometimes failures do occur  in concrete at the interface
of the connections.   These connections are a specialised subject on its
own, and the latest literature on the subject may not be available to
many structural designers in India.  Hence, a  guideline should be given
in the code on this important subject.

I trust that the above observations will be useful for inclusion in the
final copy of IS:800.

Yours truly,

N. Prabhakar
Chartered Structural Engineer
404 Star View Aptmnts
Sion Trombay Road at Chembur
Mumbai 71

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