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PostPosted: Thu Apr 24, 2008 3:03 am    Post subject: No Title Reply with quote

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PostPosted: Thu Apr 24, 2008 10:04 am    Post subject: No Title Reply with quote

Having said all about the requirements of IS 13920, one must say that
reinforcement detailing as per these requirements is by no means an easy
task. Firstly, everyone at site will blame the structural design engineer
for providing too many closely spaced links and stirrups, and long bars for
columns. If the engineerís service is provided for a builder, it would be
most unlikely that he/she will get another assignment from the builder in
future for this reason. The current practice of showing reinforcement
details for beams and columns in a tabular form by some consultants, will
not work if the details are in accordance IS 13920. The drawings have to be
total with details of each and every bar shown in elevations and sections of
beams and columns, with bar bending schedule. The site will have to strictly
adhere to the detail drawings, and the lapping of bars have to be provided
only at locations shown on the drawing, without leaving any option to the
site engineer to deviate otherwise.

The requirements of IS 13920 for structures in zones III and above as
mentioned earlier, are in effect since November 1993. How many of these
structures in a big city like Delhi which is in seismic zone IV, and
structures of more than five storeys high in the cities of seismic zone III,
like Mumbai, Kolkata, Ahmedabad, etc have adhered to the detailing
requirements of IS 13920. A national survey among design engineers may
indicate ignorance of these requirements by many. Are the municipal
engineers aware of these requirements or a self-certification by the design
engineer concerned is sufficient to shelve their responsibilities from the
public? These are some of the ponderable questions that are often raised
repeatedly. After the Gujarat earthquake, a few consultants and contractors
in Mumbai claimed through the media that their structures have withstood the
earthquake! It is a subject that nobody can be too complacent about, as it
occurred about 600 km away from Mumbai.

The design and construction of earthquake-resistant structures require more
stringent and concerted actions, both from structural engineers and
contractors, in terms of detailed design drawings, quality control in
construction at all levels and supervision of work. When reinforcement is as
closely spaced as 75 mm or 100 mm at the joints, concreting of these
sections would require extra care in design of concrete mix and in
compaction so that honeycombing does not occur at these locations.

If the workmanship is bad, such structures will not be durable, and will
deteriorate even before an earthquake strikes. IS 456 : 2000 has an
important role to play in this matter, and it cannot just pass on this
important aspect of construction by merely referring to another code.

Ref : India Concrete Journal - April 2001

Regards
Malay
Design Engineer (Structural)
Phone : +91-80-25219007 Extn : 602
Mobile : +91-9845152574
Web : http://www.total-environment.com
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PostPosted: Thu Apr 24, 2008 3:20 pm    Post subject: No Title Reply with quote

To     : sikandarsiddiqi@yahoo.com

Subject : Seismic Design of Flyovers

Date     : Tue  Aug 24  19:03:42  2004




Dear, Could anyone please do me favour by giving me names of
some books on " Seismic analysis & Design of Flyovers" with
Indian as well as British Standard specifications. That will certainly
help me in elucidating my doubts. Regards, Hardik ChoksiMaster
of Engineering [CIVIL-CASAD]Nirma Institute of TechnologyAll the news
that matters. All the gossip from home. Specially for NRIs

















































































































































































































































          
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PostPosted: Thu Apr 24, 2008 3:20 pm    Post subject: No Title Reply with quote

Thanks & Regards
Vivek Abhyankar
Design Engineer
Hindustan Construction Co.
Mumbai


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Hindustan Construction Company, Mumbai,India



-------------Original Message-------------


To:sikandarsiddiqi@yahoo.comSubject: Seismic Design of Flyovers...From:talk2hard@hotmail.com  Date:Aug 24 2004   19:03:42  

Dear All, Could anyone please do me favour by giving me names of some books on " Seismic analysis & Design of Flyovers" with Indian as well as British Standard specifications. That will certainly help me in elucidating my doubts. Regards, Hardik ChoksiMaster of Engineering [CIVIL-CASAD]Nirma Institute of TechnologyAll the news that matters. All the gossip from home. Specially for NRIs!


























          
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PostPosted: Thu Apr 24, 2008 3:20 pm    Post subject: No Title Reply with quote

Thanks & Regards
Vivek Abhyankar
Design Engineer
Hindustan Construction Co.
Mumbai


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Hindustan Construction Company, Mumbai,India



-------------Original Message-------------


To:sikandarsiddiqi@yahoo.comSubject: Seismic Design of Flyovers...From:talk2hard@hotmail.com  Date:Aug 24 2004   19:03:42  

Dear All, Could anyone please do me favour by giving me names of some books on " Seismic analysis & Design of Flyovers" with Indian as well as British Standard specifications. That will certainly help me in elucidating my doubts. Regards, Hardik ChoksiMaster of Engineering [CIVIL-CASAD]Nirma Institute of TechnologyAll the news that matters. All the gossip from home. Specially for NRIs!



























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PostPosted: Thu Apr 24, 2008 3:21 pm    Post subject: No Title Reply with quote

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PostPosted: Thu Apr 24, 2008 3:21 pm    Post subject: No Title Reply with quote

I hope this will help you.

Regards,

Paresh Patel
Jacobs Babtie India
Ahmedabad

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PostPosted: Thu Apr 24, 2008 3:22 pm    Post subject: No Title Reply with quote

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PostPosted: Thu Apr 24, 2008 3:22 pm    Post subject: No Title Reply with quote

“A series of investigations carried out by CECRI, (the results of which have been confirmed by the National Building Organisation, New Delhi, and the Central Building Research Institute, Roorkee) show that Indian Pozzolana cements offer less protection to steel subjected to aggressive conditions. Some recent foreign publications also suggest a cautious approach in using different pozzolanic cements. The durability factor for PPC is found to be 0.5 when compared to the OPC concrete. But if the use of PPC cannot be avoided the "Inhibitor" formulation developed by the CECRI may be used to improve the resistance of PPC concrete to a considerable degree”.

Views of cement manufacturing companies:

Pozzolana cements are much more durable, corrosion resistant and has every (best possible) things in their Pozzolanic cement products. And trying to get the approval from government to use the PPC in government projects.

Please put some light on this topic please

Daljeet



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PostPosted: Thu Apr 24, 2008 3:22 pm    Post subject: No Title Reply with quote

Structural engineers are also human beings and are therefore prone to make mistakes. The problem is that our education curricula -- even in the IITs -- do not teach us how to avoid failures. Therefore, we have to search for knowledge about this aspect of our life in reference books, journals and libraries, or sometimes learn it the hard way -- from our own mistakes.

The structure in question might perhaps have been better designed in steel instead of in RCC.

Indrajit Barua.


[quote]Message From  sidhudaljeet@yahoo.com
Subject: So Called Geo Tech Engineers
Date: 17/10/04
Time: 15:37:37
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