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Rgd. liquid retaining structures

 
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anu.
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Joined: 29 Apr 2011
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Location: India

PostPosted: Fri Apr 29, 2011 5:29 am    Post subject: Rgd. liquid retaining structures Reply with quote

While modelling any structures in staad material properties assigned is concrete.Do staad analysys validate for liquid retaing structures coz for liquid retaining structures M30 grade of concrete is considered.
i mean material properties such as youngs modulus, poissons ratio,Desnity will change....
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rajancivildesign@gmail.co
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Joined: 26 Jan 2011
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PostPosted: Fri Apr 29, 2011 3:03 pm    Post subject: STAAD MODEL FOR WATER TANK Reply with quote

Normally while modelling  geometry for liquid  retaining structure only concrete can be assigned. During deign stage,  you can input concrete M30 for liquid retaining structure. In STAAD it is difficult to design the liquid retaining structure because there is no provision to input limiting permissible steel stress 115N/mm2. I have designed a Counterfort Retaining wall to retain sea water act as Forebay for Thermal Power Station. Staad model with design is attached for your reference.
V.M.RAJAN.
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anu.
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Joined: 29 Apr 2011
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Location: India

PostPosted: Sat Apr 30, 2011 3:41 am    Post subject: Reply with quote

Thank you very much sir for your response.
so can i come to conclusion that analysys has nothing to do with the concrete properites .If so concrete properties in staad material properites such as youngsmodulus exists wer youngsmodulus..is dependent on grade of concrete.
you should excuse me if i am asking very basic question.
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es_jayakumar
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Joined: 24 Nov 2011
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PostPosted: Sun Jul 01, 2012 5:48 pm    Post subject: Reply with quote

Hi,
The STAAD input file for the analysis of a water tank of size 6mx4mx2.5m resting on ground & open at top is attached. Walls and bottom slab thickness is 0.20m. The support at ground is modeled as springs with subgrade modulus assumed as 30000KN/m3 (IS 2950 Part-I) for medium sand of N = 20, which when corrected for size and shape comes to 8185KN/m3. 250mm x 250mm square plate elements are used for modeling.
The moment values available from this analysis do not tally with those from our conventional methods ( including IS 3370-IV ). Kindly check the analysis to bring out the shortcomings (conceptual & procedural) of it.

Regards,

E S Jayakumar
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