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Large dia. RCC circular water tanks

 
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ranna
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Joined: 26 Jan 2003
Posts: 75

PostPosted: Sat Jan 31, 2004 10:29 am    Post subject: Large dia. RCC circular water tanks Reply with quote

If it is below ground level temp stresses need not be taken into account.
r.annathurai
trichy


gupta@mehtalia.com wrote:

[quote]Dear Malay,

What if it happens to be ground water tank ?

Thanking you,

(B. J. Gupta)

From: malay.kumar@total-environment.com
Subject: Large dia.(30m) RCC circular water tanks
Date: 29/01/04
Time: 15:42:58
----------------------------------------------------------
Dear Gupta,
What I think ( but I am not sure , you can check and verify ) that it is
possible to design a Over head Water Tank whose wall perimeter exceeds 45
mts.
What I think that Expansion joints are required for those structures which
are having free ends. And hence water tank walls are considered to
be enclosed and not having any free ends so we can ignore the possibility
of
providing Expansion joints and very well design for hoop action etc.

Regards
Malay

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gupta
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 9

PostPosted: Mon Feb 02, 2004 8:00 am    Post subject: Large dia. RCC circular water tanks Reply with quote

Dear Mr Annathurai

Tank is 750 mm below ground level and 5500mm above ground level.

Thanking you,

(B. J. Gupta)

From: ranna@bheltry.co.in
Quote:
Subject: Large dia. RCC circular water tanks
Date: 31/01/04
Time: 15:59:40
----------------------------------------------------------
If it is below ground level temp stresses need not be taken into account.
r.annathurai
trichy


gupta@mehtalia.com wrote:

Dear Malay,

What if it happens to be ground water tank ?

Thanking you,

(B. J. Gupta)

From: malay.kumar@total-environment.com
Subject: Large dia.(;#62;30m) RCC circular
water tanks
Quote:
Date: 29/01/04
Time: 15:42:58
----------------------------------------------------------
Dear Gupta,
What I think ( but I am not sure , you can check and verify )
that it is
Quote:
possible to design a Over head Water Tank whose wall perimeter
exceeds 45
Quote:
mts.
What I think that Expansion joints are required for those
structures which
Quote:
are having free ends. And hence water tank walls are
considered to
Quote:
be enclosed and not having any free ends so we can ignore the
possibility
Quote:
of
providing Expansion joints and very well design for hoop
action etc.
Quote:

Regards
Malay


________________________________________________________________
[quote]

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gupta
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 9

PostPosted: Mon Feb 02, 2004 8:07 am    Post subject: Large dia. RCC circular water tanks Reply with quote

Dear sir,

I doubt if water bar will act as expansion joint if reinforcement is continued across the joint.

Thanking you,

(B. J. Gupta)

From: s_n_surya@yahoo.com
[quote]Subject: Large dia. RCC circular water tanks
Date: 31/01/04
Time: 18:32:30
----------------------------------------------------------
DEAR SIRS
I THINK THAT I REPILED THAT WATER BAR OF -PVC-OR
RUBBER -WITH CENTRAL BULB ACTS AS  1]EXPANSION AND
CONSTRUCTION JOINT.
WE DID AT LEAST HALF A DOZEN TANKS IN LAST 15 YEARS
WITH SAME PHENOMENON AND THEY ARE STILL SAFE. PLEASE
LET ME KNOW IF I AM WRONG ALSO
SURYA
--- gupta@mehtalia.com wrote:
Dear Malay,

What if it happens to be ground water tank ?


Thanking you,


(B. J. Gupta)







From: malay.kumar@total-environment.com
Subject: Large dia.(30m) RCC
circular water tanks
Date: 29/01/04
Time: 15:42:58


----------------------------------------------------------
Dear Gupta,
What I think ( but I am not sure , you can check
and verify ) that it is
possible to design a Over head Water Tank whose
wall perimeter exceeds 45
mts.
What I think that Expansion joints are required
for those structures which
are having free ends. And hence water tank walls
are considered to
be enclosed and not having any free ends so we can
ignore the possibility
of
providing Expansion joints and very well design
for hoop action etc.

Regards
Malay



________________________________________________________________

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View user's profile Send private message
malay.kumar at total-e...
Guest





PostPosted: Tue Feb 03, 2004 5:35 am    Post subject: Large dia. RCC circular water tanks Reply with quote

Dear Mr. Gupta!
I'll rather stick to my opinion. As I told you before also what I think it's
not absolute necessary to provide an Expansion joint for and enclosed
Structure like Circular water tank , coz' it's not having any free end to
expand or to contract.
I am not sure thou , but I think I have a point - still awating replies and
satisfactory answers from some Experts in this field.

Regards
Malay

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s_n_surya at yahoo.com
Guest





PostPosted: Tue Feb 03, 2004 10:08 am    Post subject: Large dia. RCC circular water tanks Reply with quote

DEAR SIRS
I think i expressed the need for continueous concrete
.this is possible only when concrete is pumped.
still it is better to have water bar of 230 mm wide of
pvc or rubber ,which served both purposes ,in many
cases.
surya
--- malay.kumar@total-environment.com wrote:
Quote:
Dear Mr. Gupta!
I'll rather stick to my opinion. As I told you
before also what I think it's
not absolute necessary to provide an Expansion joint
for and enclosed
Structure like Circular water tank , coz' it's not
having any free end to
expand or to contract.
I am not sure thou , but I think I have a point -
still awating replies and
satisfactory answers from some Experts in this
field.

Regards
Malay


________________________________________________________________
[quote]

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gupta
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 9

PostPosted: Thu Feb 05, 2004 11:02 am    Post subject: Large dia. RCC circular water tanks Reply with quote

Dear Malay,

Foundations of circular taks may not be totally free to expand along with wall. Hence don't you there will be thermal stresses in the walls due to change in ambient temperature.   My this querry didn't appear in  today's daily digest hence repeating the same.


Thanking you,


(B. J. Gupta)


Quote:
From: malay.kumar@total-environment.com
Subject: Large dia. RCC circular water tanks
Date: 03/02/04
Time: 11:05:13
----------------------------------------------------------
Dear Mr. Gupta!
I'll rather stick to my opinion. As I told you before also what I
think it's
Quote:
not absolute necessary to provide an Expansion joint for and enclosed
Structure like Circular water tank , coz' it's not having any free
end to
Quote:
expand or to contract.
I am not sure thou , but I think I have a point - still awating replies
and
[quote]satisfactory answers from some Experts in this field.

Regards
Malay

________________________________________________________________

Posted via Email
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View user's profile Send private message
malay.kumar at total-e...
Guest





PostPosted: Thu Feb 05, 2004 12:17 pm    Post subject: Large dia. RCC circular water tanks Reply with quote

Dear Mr. Gupta Smile Now that you have answered your own question - If the tank
is NOT  totally free to Expand then there is no need to provide Expansion
joint. And you have rightly pointed it out that there'll be some thermal
stresses in the walls due to change in temperature (specially when the tank
is empty) - and in such case the walls can be designed accordingly catering
for those thermal stresses ! Personally I haven't designed such huge water
tanks which are 1/4'th below ground and remaining above , but then you can
refer some good Books regarding this interesting & challenging design !! If
I come across some Good books regarding your querry I'll definitely let you
know.

By the way can anyone suggest me a good book for design and detailing of a
complete Spiral Staircase with a Stringing Beam in between . Pls. note that
there is not a single intermediate support in between i:e : the angle of
rotation - of the staircase - between two supports is 360 degrees. I have
gone thru many books which gives design chart for such spiral staircase but
those are with intermediate supports.

Best Wishes
Malay
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