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Daily Digest Tue Nov 2 23:00:03 2004

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies.    www.sefindia.org Forum Index -> Past Discussions Year 2004
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adutt
Progressive Member
Progressive Member


Joined: 26 Jan 2003
Posts: 43

PostPosted: Wed Nov 03, 2004 5:27 am    Post subject: Daily Digest Tue Nov 2 23:00:03 2004 Reply with quote

Subject: Push over analysis and softwares...

Dear Respected Dr. S. K. Jain,
Your letter has given  us useful insight on the push over anaylsis (& related softwares),retroffing &  direction towards which the structural engineers should all collectively try to achieve in the coming years .

Thanking You

With Regards
Amit Dutt
Structural Engineer,Delhi


Dear Vipul,
I fully agree with you that we have to compete on the global level but the charges for our quality services & state of art technology is not at all at par with our  foreign counterparts (the US & Europeans Consultants & Engineers ). In fact clients in India are not willing to pay the required fees for structural consultancy yet they are ready to spend on on other services .

Thanking You

With Regards
Amit Dutt
Structural Engineer,Delhi

-----Original Message-----
Message From  general@sefindia.org [mailto:general@sefindia.org]
Sent: Wednesday, November 03, 2004 4:30 AM
To: Amit Dutt
Subject: Daily Digest Tue Nov 2 23:00:03 2004

----------------------------------------------------------
Message From  acpl_sefi@rediffmail.com
Subject: Doubt in Seismic Design
Date: 02/11/04
Time: 01:30:53
----------------------------------------------------------


General practise is the slab at grade level is ignored--though the mass of the ground floor does participate but to not that extent as compared to if it was unrestrained from the srrounding soil. Therefore it is justified to ignire the mass for seismic analysis. Otherwise every single storey building would need to be designed as a two storey building. Of course it is modelled with the plinth beam and even raft/ grade beams if provided, though without the mass at the ground level--but it is unfair to over penalise the roof beams because of limited participation of the ground floor mass

Vipul Ahuja;nbsp;


On Mon, 01 Nov 2004 for_prof_arc@hotmail.com wrote :
The framed structure is to be modelled by considering the columns fixed [or
supported by equivalent soil springs] at the top of the footing. Naturally,
the mass of the plinth beam would also be considered in that model. The top
portion of the soil upto the bottom of the footing is not modelled.

If you have a block foundation, like in Machine foundations, the embedded
soil can be modelled as equivalent soil springs.

ARC
----- Original Message -----
Message From  iyer_mahadevan@rediffmail.com
To: for_prof_arc@hotmail.com
Sent: Saturday, October 30, 2004 1:51 PM
Subject: Doubt in Seismic Design


Dear sefians,

In a building if a slab alongwith plinth beams are provided at the plinth
level (for parking etc.)should its seismic weight be lumped to the frame as
is done for higher floor levels?

Intuitively I feel that this should not be done, as the said slab as well
as beams transfer the load directly to the soil.

The IS code (IS 1893-2002) does not address this issue.

I hope you will be kind enough to clarify.

MAHADEVAN IYER
M.Tech (Structural Engg.)(3rd Sem.)
V.N.I.T. Nagpur.




Structural Engineers Forum of India  





----------------------------------------------------------

----------------------------------------------------------
Message From  acpl_sefi@rediffmail.com
Subject: Reply to Mr. Sikandar Hayat Siddiqi  ;s letter dated 29th October 2004
Date: 02/11/04
Time: 01:42:25
----------------------------------------------------------


Dear Mr. Amit Dutt

I share your concerns over lack of resources available to the Indian Consulting engineer in investing in expensive programs. However we must not forget that we need to be competitive at the global level (both commercially and technically) in the future ;amp; we must start looking towards that direction sooner than later--soon it may become a survival issue.

Vipul Ahuja 


On Mon, 01 Nov 2004 adutt@desein.com wrote :
Dear Sefians,

;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp;  I wish to share Mr. Sikandar Hayat Siddiqi  ;s deep
concern over the neglect of;nbsp; designing structures with regard to Routine
Design of Earthquake Resistant Structures. But a Performance Based
Seismic Evaluation ,Push Over Analysis ( Non linear

;nbsp; Analysis) ;amp; other sophisticated methods are easier said than done
because of lack of resources etc.

Firstly the capability of the average;nbsp; practicing structural engineers ;amp;
consultants in evaluating the ultimate seismic capacities ;amp; going for a
non linear analysis is very limited because a major;nbsp; portion of these
topics are;nbsp; been dealt only at the research level ;amp; not well established


Secondly the above said analysis will require very powerful ;amp; costly
softwares beyond the reach of most of the organizations. The most
commonly ;amp; popular software of structural engineering software in India
seems to be STAAD PRO ,but how many people have really used it for non
linear analysis is a big question.

Thirdly ;amp; probably the most important factor is that the client is not
willing to give the time which will be required for the kind of analysis
you are have suggested.



I feel as the awareness to seismic hazard ;amp; seismic risk increases over
the years within the engineering community ;amp; also the nation as a whole
the above methods of analysis;nbsp; shall find their true place.



With regards



Amit Dutt

Structural Engineer










Structural Engineers Forum of India  





----------------------------------------------------------

----------------------------------------------------------
Message From  v.goel@eil.co.in
Subject: latest revision of VDI 2056
Date: 02/11/04
Time: 10:23:10
----------------------------------------------------------
Dear Colleagues

I was interested in finding out latest revision of VDI 2056. This is
required to consider the allowable limits of vibration behaviour of
foundation for Turbo Generator. Please suggest from where I can get it.

Regards
Virender Goel


----------------------------------------------------------

----------------------------------------------------------
Message From  swet662003@yahoo.com
Subject: Re: Notify
Date: 02/11/04
Time: 13:33:31
----------------------------------------------------------

Your requested mail has been attached.



----------------------------------------------------------

----------------------------------------------------------
Message From  b.r.seshasayee@saipem-india.com
Subject: Re: Notify
Date: 02/11/04
Time: 15:35:01
----------------------------------------------------------
Dear All
I didn ;t find any attachment
Regs
B.R.Seshasayee

-----Original Message-----
Message From  swet662003@yahoo.com [mailto:swet662003@yahoo.com]
Sent: Tuesday, November 02, 2004 7:04 PM
To: Seshasayee B.R.
Subject: Re: Notify



Your requested mail has been attached.





Structural Engineers Forum of India  



----------------------------------------------------------

----------------------------------------------------------
Message From  ABHYANKAR@hccindia.co.in
Subject: KARL TERZAGHI - Father of Soil Mechanics
Date: 02/11/04
Time: 16:53:57
----------------------------------------------------------


KvT in a nutshell:
Born: October 2, 1883 in Prague
Died: October 25, 1963 in Winchester, Massachusetts
He was married to Ruth D. Terzaghi, a geologist.
He won the Norman Medal of ASCE four times (1930, 1943, 1946, and 1955).
He was given nine honorary doctorate degrees from universities in eight
different countries.
He started modern soil mechanics with his theories of consolidation,
lateral earth pressures, bearing capacity, and stability.

KvT ;s Publications
The following is a brief list of his major publications, a complete list
has not yet been compiled. A list of his first 256 papers and reports can be
found in From Theory to Practice in Soil Mechanics - Karl Terzaghi by
Bjerrum, et al., John Wiley and Sons, 1960. An update was published by
Geotechnique, March 1964. Recently a private copilation of Terzaghi ;s works
has been uncovered---see the Terzaghi Libraries and Museums. terzagi3.htm
Terzaghi, K., 1925, Erdbaumechanik, Franz Deuticke, Vienna
This is where he presented to the world the new science, Soil Mechanics,
that he developed mainly while working at ITU and Bogazici University (then
known as Robert College) in Istanbul (then known by some as Constantinople).
We have a picture of that campus --The birth place of Soil Mechanics--
bebek.gif People who see this photo say if you worked there you were
bound to invent something. The exact birth place is at the top of the hill,
in that photo, just above the left tower of the castle-- the castle, by the
way, was built by Fatih in 1453. It may be worthwhile to record here that
KvT has done his consolidation tests --the first in history--in cigarette
boxes For the benefit of the younger generations who may not know what a
cigarette box is, here is the background information about cigarette boxes.
terzagi2.htm
Terzaghi, K., 1934, Large Retaining Wall Tests, Engineering News Record
Feb.1, March 8, April 19
This is where he presents his experimental side. He invented very ingenious
tools for measurement of forces and displacements. He apparently designed,
constructed, and performed all his tests himself.
Terzaghi, K., 1943, Theoretical Soil Mechanics, John Wiley and Sons, New
York
In this monumental work he lays it all out: consolidation theory,
settlement calculations, bearing capacity theory, lateral earth pressures
and retaining walls, shear strength and slope stability. In all cases he
makes it clear that he is doing all that to be able to solve real world
problems. He always gives design/analysis charts to make it easier for the
engineer to apply the theories he developed or reorganized and perfected for
practical use.
Terzaghi, K., and Ralph B. Peck, 1948, Soil Mechanics in Engineering
Practice, John Wiley and Sons, New York
The second edition by Ralph B. Peck, 1967
The third edition by Ralph B. Peck and Gholamreza Mesri, 1996

Stories about Terzaghi
KvT ;s famous Court Appearence terzagi4.htm story.
Story contributed by Cameran Mirza, P.E.
KvT was the advisor of one of the earliest doctoral theses awarded at MIT,
Boston, MA, in all engineering fields. It is also said that at the time, it
was believed that engineers were not capable of such things as a doctoral
study.
The grand master ;s Home Page is not complete, as you see. We will accept
any information, advice, and opinion contributed by our readers until 113th
birthday of the Father of Soil Mechanics.

Terzaghi Quotes

http://www.geoengineer.org/terzaghi.html

Karl Terzaghi Lecture

THE AWARD:
This lectureship was established by the Soil Mechanics and Foundations
Division (now the Geo-Institute) of the Society by the solicitation of gifts
from the many friends and admirers of Karl Terzaghi, Hon.M.ASCE. It was
instituted by the Board of Direction on October 10, 1960. Income from the
award fund will be used only to pay for honoraria and certificates.

The award consists of a certificate and a cash prize determined annually by
and subject to the approval of the Society Awards Committee based on the
income from the award endowment.

CRITERIA:
At about yearly intervals and upon recommendation of the Board of Governors
of the Geo-Institute, the Executive Director will invite a distinguished
engineer to deliver a Terzaghi Lecture at an appropriate meeting of the
Society.


Above is a Birth place of -  ;SOIL MECHANICS ;

1) Soil Mechanics in Engineering Practice
Author(s): Karl Terzaghi, Ralph B. Peck, Gholamreza Mesri
Average Customer Rating:
Availability: Usually ships in 24 hours

List Price: $110.00    
Our Price: $110.00    Used: $106.17

2) Theoretical Soil Mechanics
Author(s): Karl Terzaghi
Average Customer Rating:
Availability: This item is currently not available.

3)  From Theory to Practice in Soil Mechanics
Author(s): Karl Terzaghi
Average Customer Rating:
Availability: This item is currently not available.

4) From theory to practice in soil mechanics;: Selections from the writings
of Karl Terzaghi, with bibliography and contributions on his life and
achievents,
Author(s): Karl Terzaghi
Availability: This item is currently not available.


-----------------------------------------------------------------
Hindustan Construction Company, Mumbai, India
Sent using PostMaster by QuantumLink Communications Pvt Ltd




----------------------------------------------------------

----------------------------------------------------------
Message From  adutt@desein.com
Subject: I cannot forget you!
Date: 02/11/04
Time: 16:59:39
----------------------------------------------------------
lovely, Smile

++++ Attachment: No Virus found
++++ Norton AntiVirus - www.symantec.de


----------------------------------------------------------

----------------------------------------------------------
Message From  sdec@bol.net.in
Subject: Reply to Mr. Sikandar Hayat Siddiqi  ;s letter
dated 29th October 2004
Date: 02/11/04
Time: 18:19:45
----------------------------------------------------------
Dear Vipul,
I guess a time has come when maybe we need to pool resources and form a
couple of formidable consortiums to be able to fight the Big FishAny takers
of the idea?
Sangeeta Wij
----- Original Message -----
Message From  acpl_sefi@rediffmail.com
To: sdec@bol.net.in
Sent: Tuesday, November 02, 2004 2:00 AM
Subject: Reply to Mr. Sikandar Hayat Siddiqi  ;s letter
dated 29th October 2004




Dear Mr. Amit Dutt

I share your concerns over lack of resources available to the Indian
Consulting engineer in investing in expensive programs. However we must
not forget that we need to be competitive at the global level (both
commercially and technically) in the future ;amp; we must start looking
towards that direction sooner than later--soon it may become a survival
issue.

Vipul Ahuja


On Mon, 01 Nov 2004 adutt@desein.com wrote :
Dear Sefians,

;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp;
I wish to share Mr. Sikandar Hayat Siddiqi  ;s deep
concern over the neglect of;nbsp; designing structures with regard to
Routine
Design of Earthquake Resistant Structures. But a Performance Based
Seismic Evaluation ,Push Over Analysis ( Non linear

;nbsp; Analysis) ;amp; other sophisticated methods are easier said
than done
because of lack of resources etc.

Firstly the capability of the average;nbsp; practicing structural
engineers ;amp;
consultants in evaluating the ultimate seismic capacities ;amp; going
for a
non linear analysis is very limited because a major;nbsp; portion of
these
topics are;nbsp; been dealt only at the research level ;amp; not well
established


Secondly the above said analysis will require very powerful ;amp;
costly
softwares beyond the reach of most of the organizations. The most
commonly ;amp; popular software of structural engineering software in
India
seems to be STAAD PRO ,but how many people have really used it for non
linear analysis is a big question.

Thirdly ;amp; probably the most important factor is that the client is
not
willing to give the time which will be required for the kind of
analysis
you are have suggested.



I feel as the awareness to seismic hazard ;amp; seismic risk increases
over
the years within the engineering community ;amp; also the nation as a
whole
the above methods of analysis;nbsp; shall find their true place.



With regards



Amit Dutt

Structural Engineer










Structural Engineers Forum of
India  









Structural Engineers Forum of India  







----------------------------------------------------------

----------------------------------------------------------
Message From  skjain@iitk.ac.in
Subject: Push over analysis and softwares...
Date: 02/11/04
Time: 19:07:29
----------------------------------------------------------
Dear Amit, Vipul, Sangeeta and others:

The push over analysis is not such a big deal in terms of software. For
instance, the SAP2000 is one of the well-respected software that also
has good capabilities for push over analysis. After the Gujarat
earthquake on my suggestion,  the firm CSI had agreed to provide this
software at a fraction of their regular price to Indian engineers and
many colleagues in the country indeed bought the software.

The main thing is:

a) Push over analysis require considerable amount of understanding of
the subject by the analyst. A large numer of assumptions are needed, and
member response curves are to be provided to the programme before it can
analyze. Hence, it is really a question about Indian structural firms
investing on the training of their engineers. My own impressions are
that many very good firms in India unfortunately do not consider
training to be useful. This could be because they do not realise the
need for training because they are doing roaring business anyway, or it
could be that the training quality in our country leaves much to be
desired. It is a universal fact that in the name of training workshops,
anything goes.

b) As of now, one does not expect push over analysis to be used for
design of new buildings; certainly not the ordinary buildings. However,
it is emerging as a very important tool for assessment of safety of
existing buildings and for retrofitting of the same. Unfortunately,
serious efforts by Indian structural firms towards retrofitting  jobs
have been lacking: this is evident in Gujarat where a major opportunity
has been lost after the 2001 earthquake for some good retrofitting work.
In fact, I am told that in some of the large contracts by the Govt of
Gujarat, some large structural firms otherwise well respected have given
rather simplistic and general recommendations for retrofitting of
buildings without backing these with any calculations or design philosophy.

My recommendation is that we all should collectively decide to improve
the state of the practice and for that we need to invest in training of
our people. As we do better quality of work, it will be possible to
charge more money for our services (I know Sangeeta will complain that
clients are not willing to pay!).

Best regards,

Sudhir

sdec@bol.net.in wrote:

Dear Vipul,
I guess a time has come when maybe we need to pool resources and form a
couple of formidable consortiums to be able to fight the Big FishAny takers
of the idea?
Sangeeta Wij
----- Original Message -----
Message From  acpl_sefi@rediffmail.com
To: sdec@bol.net.in
Sent: Tuesday, November 02, 2004 2:00 AM
Subject: Reply to Mr. Sikandar Hayat Siddiqi  ;s letter
dated 29th October 2004




Dear Mr. Amit Dutt

I share your concerns over lack of resources available to the Indian
Consulting engineer in investing in expensive programs. However we must
not forget that we need to be competitive at the global level (both
commercially and technically) in the future ;amp; we must start looking
towards that direction sooner than later--soon it may become a survival
issue.

Vipul Ahuja


On Mon, 01 Nov 2004 adutt@desein.com wrote :
Dear Sefians,

;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp; ;nbsp;
I wish to share Mr. Sikandar Hayat Siddiqi  ;s deep
concern over the neglect of;nbsp; designing structures with regard to
Routine
Design of Earthquake Resistant Structures. But a Performance Based
Seismic Evaluation ,Push Over Analysis ( Non linear

;nbsp; Analysis) ;amp; other sophisticated methods are easier said
than done
because of lack of resources etc.

Firstly the capability of the average;nbsp; practicing structural
engineers ;amp;
consultants in evaluating the ultimate seismic capacities ;amp; going
for a
non linear analysis is very limited because a major;nbsp; portion of
these
topics are;nbsp; been dealt only at the research level ;amp; not well
established


Secondly the above said analysis will require very powerful ;amp;
costly
softwares beyond the reach of most of the organizations. The most
commonly ;amp; popular software of structural engineering software in
India
seems to be STAAD PRO ,but how many people have really used it for non
linear analysis is a big question.

Thirdly ;amp; probably the most important factor is that the client is
not
willing to give the time which will be required for the kind of
analysis
you are have suggested.



I feel as the awareness to seismic hazard ;amp; seismic risk increases
over
the years within the engineering community ;amp; also the nation as a
whole
the above methods of analysis;nbsp; shall find their true place.



With regards



Amit Dutt

Structural Engineer










Structural Engineers Forum of
India  









Structural Engineers Forum of India  











Structural Engineers Forum of India  






----------------------------------------------------------

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