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Teng's curve
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JVCSNL
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Joined: 26 Jan 2003
Posts: 159

PostPosted: Tue Jun 30, 2009 3:21 am    Post subject: Re: Teng's curve Reply with quote

Dear Sefians,

As requested by others, the generalized numerical approach to solve footings loaded with biaxial eccentricity is uploaded.

Regards,

Jignesh Chokshi



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Footing_With_BiAxial_Moments.pdf
 Description:
Numerical approach for analysis of footings subjected to axial loads and large bi axial moments

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ishacon
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PostPosted: Tue Jun 30, 2009 10:42 am    Post subject: Teng's curve Reply with quote

Well, back in 1969 at IIT Madras, Prof Shankaran introduced us in final year B.Tech ,to Teng's curves
from book Foundation Design by Teng !!!

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[quote] ----- Original Message -----
From: ibarua (forum@sefindia.org)
To: general@sefindia.org (general@sefindia.org)
Sent: Sunday, June 28, 2009 7:23 PM
Subject: [SEFI] Re: Teng's curve


28th June 2009

I confess that I'm also unaware of Teng's curve.

In 1974-75, we had to design a sugar mill building - built up rigid portal frame, span 28.5 m., eaves height 15 m., with a 15 t. EOT crane. The foundations had a high eccentricity (M/P). We took recourse to the triangular positive pressure under the footing (considering the reduced base area) as proposed in 'Steel Designer's Manual' The building has performed satisfactorily over the years.

Indrajit Barua.


On Tue, 23 Jun 2009 drnsmani wrote :
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prao5555
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PostPosted: Wed Jul 01, 2009 8:08 pm    Post subject: Teng's curve Reply with quote

--- On Tue, 6/30/09, ishacon <forum@sefindia.org> wrote:

Quote:
From: ishacon <forum@sefindia.org>
Subject: [SEFI] Re: Teng's curve
To: general@sefindia.org
Date: Tuesday, June 30, 2009, 8:31 PM







     

     Well, back in 1969 at IIT Madras,
Prof Shankaran introduced us in final year B.Tech ,to
Teng's curves

from book Foundation Design by Teng !!!



VP AGARWAL

ISHA CONSULTANTS (P) LTD

NEW DELHI

PH : 011- 2630 1158

(M) 93 1345 2180

(M) 98 6826 2759

ishacon@bol.net.in
(ishacon@bol.net.in)

ishacon.vpa@gmail.com
(ishacon.vpa@gmail.com)



Quote:
----- Original Message -----

From: ibarua (forum@sefindia.org)


To: general@sefindia.org
(general@sefindia.org)


Sent: Sunday, June
28, 2009 7:23 PM

Subject: [SEFI] Re:
Teng's curve





28th June 2009



I confess that I'm also unaware of Teng's curve.




In 1974-75, we had to design a sugar mill building - built
up rigid portal frame, span 28.5 m., eaves height 15 m.,
with a 15 t. EOT crane. The foundations had a high
eccentricity (M/P). We took recourse to the triangular
positive pressure under the footing (considering the reduced
base area) as proposed in 'Steel Designer's
Manual' The building has performed satisfactorily over
the years.



Indrajit Barua.





On Tue, 23 Jun 2009 drnsmani wrote :

--auto removed--

     






     



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karthick.D
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Joined: 08 Jul 2009
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PostPosted: Wed Jul 08, 2009 7:06 am    Post subject: Teng's Curve Reply with quote

Dear ones

Can anybody help me in using Teng’s Curve . it is given that IV zones and corresponding formulas to find out the maximum pressure, but finding out the reduced area (Example: In case III how can we decide the distances N and M, is it by iteration or some other method) is tedious. I need more clarification on referring the chart and how to take values and interpret it with those formulas given for different zones. The informations will be very useful.

Thanks
Karthick D


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sudhakarebvn
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PostPosted: Thu Apr 15, 2010 9:04 am    Post subject: Reply with quote

Dear Sir,
It is Very Simple, In Case -III from fig we acn find "D" value =0.5*L-el . Like wise A=0.5*B-eb. from these value we can find R value. Later on successive value can be found.
Good Luck
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abhio
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PostPosted: Thu Apr 15, 2010 12:00 pm    Post subject: Reply with quote

Dear Dr Subramanian, I could not understand why you say that the charts will not be useful for tower foundations. Could you please clarify?

Thanks and regards,

Abhijeet Oundhakar
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sparkar
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PostPosted: Fri Apr 16, 2010 8:16 am    Post subject: Reply with quote

Teng's Curve are widely used for design of open foundations subjected to axial loads in combination with biaxial bending. The curves are originally given in book " Foundation Design " by Wayne Teng. They have also been reproduced in the book " Concrete Bridge Design " by Dr. V.K. Raina.
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bijay sarkar
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Joined: 14 Dec 2009
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PostPosted: Fri Apr 16, 2010 9:15 am    Post subject: Reply with quote

Dear All,

Teng's Chart is  used in case of detachment of foundation from soil. However, As the phenomena is complex in nature to idenfy what exactly happens, we do not allow such type of detachment of foundation for un-submerged condition check. For submerged condition check, 20% of the foundation area is allowed to be detached, if required.

Thanking you,

With regards,

Bijay Sarkar
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bkkk
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PostPosted: Fri Apr 16, 2010 12:51 pm    Post subject: Foundation design by Teng Reply with quote

Dear Sefians

Foundation design by Wayne C.Teng is a very usefull book on Siol Mechanics and foundation engg  and it is woth to buy the book at any cost.

er.Balaji venkateswaran
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Dr. N. Subramanian
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PostPosted: Fri Apr 16, 2010 6:56 pm    Post subject: Re: Foundation design by Teng Reply with quote

I think a cheap edition of this book is available in India
NS
bkkk wrote:
Dear Sefians

Foundation design by Wayne C.Teng is a very usefull book on Siol Mechanics and foundation engg  and it is woth to buy the book at any cost.

er.Balaji venkateswaran
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