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DESIGN OF WATER TANKS
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LELE AND ASSOCIATES
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Joined: 17 Apr 2010
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PostPosted: Sat May 07, 2011 3:42 am    Post subject: DESIGN OF WATER TANKS Reply with quote

DEAR ALL,

We are designing two water tanks, one being above the ground and one being under ground. Our question is how do we assume the support conditions for the walls. IS3370 part-4 gives us tables for different support conditions of the walls.

How exactly we apply these conditions to our case.

Can we have guidance on this?
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sukanta.adhikari
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PostPosted: Sat May 07, 2011 4:14 am    Post subject: Re: DESIGN OF WATER TANKS Reply with quote

Dear Prashant,

You can refer the book by Dayaratnam on water retaining structure..where he mentions fixed condition can generally be taken for the the panel on two side of the wall and at the interface of wall and bottom slab..the top slab which is generally of lesser depth compared to the base raft and wall can be taken as hinged.


However I will wait for Vikramjeet sir's explanation.

Regards,
S.Adhikari

LELE AND ASSOCIATES wrote:
DEAR ALL,

We are designing two water tanks, one being above the ground and one being under ground. Our question is how do we assume the support conditions for the walls. IS3370 part-4 gives us tables for different support conditions of the walls.

How exactly we apply these conditions to our case.

Can we have guidance on this?
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LELE AND ASSOCIATES
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Joined: 17 Apr 2010
Posts: 118

PostPosted: Sat May 07, 2011 8:05 am    Post subject: WATER TANKS Reply with quote

Dear Adhikari Sir

Thanks for the reply, however the book by P Dayaratnam as suggested is not available, can you suggest us some other good reference.

We shall also await reply of Vikramjeet Sir on this topic.

Thank you
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k.gangadharan
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PostPosted: Sat May 07, 2011 10:28 am    Post subject: DESIGN OF WATER TANKS Reply with quote

dear s.Adhikari
Is there a separate book 'on water retaining structures' by Prof: Dayaratnam other than his renforced concrete design book.Please clarify

regards
K.Gangadharan
assekg1@gmail.com (assekg1@gmail.com)



On Sat, May 7, 2011 at 9:44 AM, sukanta.adhikari <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
  Dear Prashant,

You can refer the book by Dayaratnam on water retaining structure..where he mentions fixed condition can generally be taken for the the panel on two side of the wall and at the interface of wall and bottom slab..the top slab which is generally of lesser depth compared to the base raft and wall can be taken as hinged.


However I will wait for Vikramjeet sir's explanation.

Regards,
S.Adhikari  


LELE AND ASSOCIATES wrote:  DEAR ALL,

We are designing two water tanks, one being above the ground and one being under ground. Our question is how do we assume the support conditions for the walls. IS3370 part-4 gives us tables for different support conditions of the walls.

How exactly we apply these conditions to our case.

Can we have guidance on this?









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venkatesh
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PostPosted: Sat May 07, 2011 11:14 am    Post subject: Water Tanks Reply with quote

Dear Sefian,

      There shuld be more clarity on your question. what is the size of the tank , whether it is one over another or two diferent tanks, circular or Rectangular. Generally the behaviour of walls depends upon the height and L/B ratios if its' rectangular. we assume fixed at bottom and free at top. Apart from Dayaratnam you can refer R.C.C. Designs by Ghambir, R.c.C. structures by Vazrani & Ratwani, Advanced R.c.c. Designs by S.S. Bhavikatti,   R.C.C Designs by Punimia. For only Elevetaed water Tanks you can refer Advanced R.C.C. by Krishnam Raju


regards
Venkatesh
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venkatesh
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PostPosted: Sat May 07, 2011 12:38 pm    Post subject: Reply with quote

Sir,
There is no seperate book by dayaratnam for only water tank structures.

regards
Venkatesh
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sukanta.adhikari
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PostPosted: Sat May 07, 2011 7:59 pm    Post subject: Re: DESIGN OF WATER TANKS Reply with quote

Dear Sir,

The chapter on water retaining structure is contained in one book.Sorry earlier post
is confusing.

Regards,
SA


k.gangadharan wrote:
dear s.Adhikari
Is there a separate book 'on water retaining structures' by Prof: Dayaratnam other than his renforced concrete design book.Please clarify
  
regards
K.Gangadharan
assekg1@gmail.com (assekg1@gmail.com)


  
On Sat, May 7, 2011 at 9:44 AM, sukanta.adhikari <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
  Dear Prashant,

You can refer the book by Dayaratnam on water retaining structure..where he mentions fixed condition can generally be taken for the the panel on two side of the wall and at the interface of wall and bottom slab..the top slab which is generally of lesser depth compared to the base raft and wall can be taken as hinged.


However I will wait for Vikramjeet sir's explanation.

Regards,
S.Adhikari  


LELE AND ASSOCIATES wrote:  DEAR ALL,

We are designing two water tanks, one being above the ground and one being under ground. Our question is how do we assume the support conditions for the walls. IS3370 part-4 gives us tables for different support conditions of the walls.

How exactly we apply these conditions to our case.

Can we have guidance on this?









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vikram.jeet
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PostPosted: Mon May 09, 2011 5:10 am    Post subject: DESIGN OF WATER TANKS Reply with quote

As rightly guided by Er Sukanta Adhikari, the top slab is generally
considered hinged condition whereas other conditions must  
aim full fixity to provide leak proof tank.
To further elaborate:---
A] Circular water tanks
Design of wall
- - Hinged base condition for working out hoop tension
(refer cl 3.1.2.1 of IS3370 part IV for explanation)
- - -Fixed base condition for full fixity at base of wall

Design of Base slab  
- - -Fixed base condition for full fixity at base

Effect of top slab
Refer clause 3.1.4 of IS3370 part IV for walls dowelled to roof slab

B] Rectangular water tanks
Design of walls  
- - -Fixed base condition for full fixity at base

Design of Base slab  
- - -Fixed base condition for full fixity at base

Effect of top slab
IS3370 part IV provides coefficients for  
Table -1 Top hinged , bottom hinged
Table -2 Top free , bottom hinged
Table -3 Top free, bottom Fixed
There is no table for top hinged and bottom fixed

Use Table -3 for various coefficients regarding fixity moments
at base in vertical direction and panel edge moments in horz
direction.Also span mo in horz direction may be read from table-3
which may be conservative
However use table 1 for span moments in vertical direction

Otherwise see MOODY's TABLES where all conditions are  
found in various tables.


best regards

vikramjeet




Dear Prashant,
You can refer the book by Dayaratnam on water retaining structure..where he mentions fixed condition can generally be taken for the the panel on two side of the wall and at the interface of wall and bottom slab..the top slab which is generally of lesser depth compared to the base raft and wall can be taken as hinged.
However I will wait for Vikramjeet sir's explanation.
Regards,
S.Adhikari
   LELE AND ASSOCIATES wrote:  DEAR ALL,
We are designing two water tanks, one being above the ground and one being under ground. Our question is how do we assume the support conditions for the walls. IS3370 part-4 gives us tables for different support conditions of the walls.
How exactly we apply these conditions to our case.
Can we have guidance on this?


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LELE AND ASSOCIATES
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Posts: 118

PostPosted: Wed May 11, 2011 5:16 am    Post subject: WATER TANKS Reply with quote

DEAR ALL

Thank you Vikramjeet Sir for your valuable guidance. Sir, you have mentioned about Moody's tables in the reply. How can we get hold of these tables, if you can help me with these tables it will be of great help.

We are trying to develop a excel sheet for the designs of under ground water tanks, which we will share with all the members once it is done.

One more query, do we need to consider the seismic forces in designing the UGWT and how should we proceed?

Your guidance will be of great value addition to our knowledge.

Thanking you once again, and thanks to all who participated in this discussion.
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LELE AND ASSOCIATES
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PostPosted: Wed May 11, 2011 5:57 am    Post subject: WATER TANKS Reply with quote

DEAR VIKRAMJEET SIR

After receiving your reply we were going through Reynold's Reinforced Concrete Designer's Handbook and came across the following tables:
Rectangular tanks: triangular distributed load (elastic analysis-1) table 2.78 and 2.79, which has the edge condition for walls as TOP HINGED AND BOTTOM FIXED

Could we use this table for designing the walls of UGWT with top slab.

Will await to confirm out thoughts

Thank you
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