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Expansion Joints

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies. Thank Post    www.sefindia.org Forum Index -> E-Conference on Tall Buildings
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subhash_mehrotra
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Joined: 16 Nov 2012
Posts: 7

PostPosted: Sat Dec 01, 2012 1:42 pm    Post subject: Expansion Joints Reply with quote

Dear All,


As per clause 27.2 of IS-456:2000, the structures exceeding 45 mtr in length are to be designed with one or more expansion joints.   


Considering that below ground the effect of temperature is less, one should provide joints in basement portions at a spacing of about 90.0 mtr.  When joints are provided more than 90 mtr spacing, cracks do appear after passage of time due to creep effect even if we provide shrinkage strips during casting.


Whenever building dimensions exceeds 45 mtr one should do temperature and shrinkage analysis by adding one more primary load case.  The load factors to be considered while combining temperature, shrinkage load with DL and LL are as under as per SP:24:983



  1.   1.4  (D.L.+ T)   2.    0.75 (1.4 DL + 1.4 T + 1.7 LL)


Note:    Earthquake separation joints between adjacent units shall be catered for as per clause 7.11.3 of IS 1893 (Part-I) 2002.


 
 
Regards,
S C Mehrotra

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thirumalaichettiar
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Joined: 26 Jan 2003
Posts: 3549

PostPosted: Sat Dec 01, 2012 3:51 pm    Post subject: Reply with quote

Reference to Er.S C Mehrotra , I would like to bring another aspect of joint SEISMIC JOINT. This is different from Expansion joint.
Viewers can browse the link below for some more informations on Expansion joint.

http://www.sefindia.org/forum/viewtopic.php?t=9857

http://www.sefindia.org/forum/viewtopic.php?t=5279

DILATION JOINT:

Browse the link below.

http://www.sefindia.org/forum/viewtopic.php?t=6671

Seismic and Expansion joint


http://www.sefindia.org/forum/viewtopic.php?t=5190

T.RangaRajan.
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Surendra S
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Joined: 25 Sep 2009
Posts: 16

PostPosted: Sat Dec 01, 2012 4:15 pm    Post subject: Expansion Joints Reply with quote

Dear Sefians


Whether the clause 7.11.3 is practically possible in high rise buildings.? pls suggest...

rgds
Surendra

On Sat, Dec 1, 2012 at 8:25 PM, subhash_mehrotra <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           Dear All,


As per clause 27.2 of IS-456:2000, the structures exceeding 45 mtr in length are to be designed with one or more expansion joints. 


Considering that below ground the effect of temperature is less, one should provide joints in basement portions at a spacing of about 90.0 mtr.  When joints are provided more than 90 mtr spacing, cracks do appear after passage of time due to creep effect even if we provide shrinkage strips during casting.


Whenever building dimensions exceeds 45 mtr one should do temperature and shrinkage analysis by adding one more primary load case.  The load factors to be considered while combining temperature, shrinkage load with DL and LL are as under as per SP:24:983



  1.   1.4  (D.L.+ T)   2.    0.75 (1.4 DL + 1.4 T + 1.7 LL)


Note:    Earthquake separation joints between adjacent units shall be catered for as per clause 7.11.3 of IS 1893 (Part-I) 2002.


 
 
Regards,
S C Mehrotra
     



     



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thirumalaichettiar
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PostPosted: Sat Dec 01, 2012 4:56 pm    Post subject: Reply with quote

Er.Surendra ,
Pl.inform which code the clause the clause 7.11.3 is present?

T.RangaRajan.
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shahnawaz.sdk
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Joined: 24 Jan 2010
Posts: 2
Location: Thane

PostPosted: Sun Dec 02, 2012 3:04 pm    Post subject: Expansion Joints Reply with quote

Hi


Is there any book which can explain the calculation and effect of temperature n creep on buildings.

Regards


Shahnawaz Siddiqui
Integrated Buildings


On 01-Dec-2012, at 20:25, "subhash_mehrotra" <forum@sefindia.org (forum@sefindia.org)> wrote:


Quote:
           Dear All,


As per clause 27.2 of IS-456:2000, the structures exceeding 45 mtr in length are to be designed with one or more expansion joints.


Considering that below ground the effect of temperature is less, one should provide joints in basement portions at a spacing of about 90.0 mtr. When joints are provided more than 90 mtr spacing, cracks do appear after passage of time due to creep effect even if we provide shrinkage strips during casting.


Whenever building dimensions exceeds 45 mtr one should do temperature and shrinkage analysis by adding one more primary load case. The load factors to be considered while combining temperature, shrinkage load with DL and LL are as under as per SP:24:983



1. 1.4 (D.L.+ T) 2. 0.75 (1.4 DL + 1.4 T + 1.7 LL)


Note: Earthquake separation joints between adjacent units shall be catered for as per clause 7.11.3 of IS 1893 (Part-I) 2002.




Regards,
S C Mehrotra
     



     



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Prasad Ghodekar
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Joined: 04 Nov 2008
Posts: 1
Location: India

PostPosted: Sun Dec 02, 2012 6:43 pm    Post subject: Expansion Joints Reply with quote

Hello Sir,

I am working on one of such kind of project. Do you have further study material for the same. Also, if you any example on this, please let me know.

Many Thanks.

Regards,
Prasad Ghodekar.

On 1 December 2012 20:25, subhash_mehrotra <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           Dear All,


As per clause 27.2 of IS-456:2000, the structures exceeding 45 mtr in length are to be designed with one or more expansion joints. 


Considering that below ground the effect of temperature is less, one should provide joints in basement portions at a spacing of about 90.0 mtr.  When joints are provided more than 90 mtr spacing, cracks do appear after passage of time due to creep effect even if we provide shrinkage strips during casting.


Whenever building dimensions exceeds 45 mtr one should do temperature and shrinkage analysis by adding one more primary load case.  The load factors to be considered while combining temperature, shrinkage load with DL and LL are as under as per SP:24:983



  1.   1.4  (D.L.+ T)   2.    0.75 (1.4 DL + 1.4 T + 1.7 LL)


Note:    Earthquake separation joints between adjacent units shall be catered for as per clause 7.11.3 of IS 1893 (Part-I) 2002.


 
 
Regards,
S C Mehrotra
     



     



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sudeepmgs
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Joined: 24 Sep 2009
Posts: 2

PostPosted: Mon Dec 03, 2012 5:15 am    Post subject: Expansion Joints Reply with quote

Respected sir,

   Thank you sir, this is very good information for row and high rise structures.


Regards,

SUDEEP MG
Bangalore.





On Sat, Dec 1, 2012 at 8:25 PM, subhash_mehrotra <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           Dear All,


As per clause 27.2 of IS-456:2000, the structures exceeding 45 mtr in length are to be designed with one or more expansion joints. 


Considering that below ground the effect of temperature is less, one should provide joints in basement portions at a spacing of about 90.0 mtr.  When joints are provided more than 90 mtr spacing, cracks do appear after passage of time due to creep effect even if we provide shrinkage strips during casting.


Whenever building dimensions exceeds 45 mtr one should do temperature and shrinkage analysis by adding one more primary load case.  The load factors to be considered while combining temperature, shrinkage load with DL and LL are as under as per SP:24:983



  1.   1.4  (D.L.+ T)   2.    0.75 (1.4 DL + 1.4 T + 1.7 LL)


Note:    Earthquake separation joints between adjacent units shall be catered for as per clause 7.11.3 of IS 1893 (Part-I) 2002.


 
 
Regards,
S C Mehrotra
     



     



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