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Staad Pro for mat foundation

 
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venkatsuba
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Joined: 26 Jan 2003
Posts: 8

PostPosted: Mon Jul 19, 2010 7:36 pm    Post subject: Staad Pro for mat foundation Reply with quote

Dear Sefians


We have designed several mats which support as little as two pedestals, combinations of pedestals and shear walls, and even large mats with multiple columns and forces using Staad Pro with plate elements set to the thickness of the mat.  Foundation Springs were provided as per Modulus of Subgrade Reaction for the soils.  Loads added at support points (pedestals) and the analysis done.

The following were taken from the Staad out put for RC design:

1. Soil Bearing pressure - to confirm it is within the allowable SBC
2. Bending & Shear - for reinforcement requirement.
3. Displacement - to check allowable settlement
 
The punching shear & stability checks( Over turning & Sliding) were performed manually.


I kindly request the dear members to confirm whether this approach of design is correct or it has any flaws and advice the right approach. We don't have "Staad Foundation module" with us.



Regards


Subashini

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sekharbrs
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Joined: 03 Jul 2010
Posts: 14

PostPosted: Tue Jul 20, 2010 9:02 am    Post subject: Reply with quote

The procedure followed seems OK.

I do not know how you are getting the Subgrade reactions, normal procedure is to give based on the "Bowles" formula "1000/(allowable settlement in mm) x safety factor (Generally 2/3/4) x SBC of soil" .

And one way shear along the length of the mat also shall be checked in some cases, where one side supports are more compared to the other or in the case of concentration of reactions is more compared to the other side.

Regards,
Sekhar
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taorigiriraj
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Joined: 07 Apr 2008
Posts: 6

PostPosted: Sat Jul 24, 2010 4:31 pm    Post subject: Staad Pro for mat foundation Reply with quote

Please confirm how you are checking SBC directly from staad.


--- On Tue, 7/20/10, venkatsuba <forum@sefindia.org> wrote:

Quote:

From: venkatsuba <forum@sefindia.org>
Subject: [SEFI] Staad Pro for mat foundation
To: general@sefindia.org
Date: Tuesday, July 20, 2010, 7:47 AM

Dear Sefians


We have designed several mats which support as little as two pedestals, combinations of pedestals and shear walls, and even large mats with multiple columns and forces using Staad Pro with plate elements set to the thickness of the mat. Foundation Springs were provided as per Modulus of Subgrade Reaction for the soils. Loads added at support points (pedestals) and the analysis done.

The following were taken from the Staad out put for RC design:

1. Soil Bearing pressure - to confirm it is within the allowable SBC
2. Bending & Shear - for reinforcement requirement.
3. Displacement - to check allowable settlement

The punching shear & stability checks( Over turning & Sliding) were performed manually.


I kindly request the dear members to confirm whether this approach of design is correct or it has any flaws and advice the right approach. We don't have "Staad Foundation module" with us.



Regards


Subashini








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thirumalaichettiar
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Joined: 26 Jan 2003
Posts: 3459

PostPosted: Sun Jul 25, 2010 1:04 am    Post subject: Reply with quote

Mat Foundation Design:

It is better to use STAAD foundation software which is a separate module.

Otherwise you can make use of SAFE from CSI since it is an easy to use and more versatile software for foundation design of Mat.

T.Rangarajan.
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Aadhavan
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Joined: 09 Jan 2010
Posts: 3

PostPosted: Sun Jul 25, 2010 10:17 am    Post subject: Re: Mat Foundation Reply with quote

Dear Sirs

I have not used Staad Pro for modelling Mat / Raft Foundations till now and i am much interested to know about it. Kindly post me a sample model showing a structure designed with foundation springs and raft foundation. Also it would be very helpful if an example is given for shear wall raft model as well.


Thanks in advance
Aadhav
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ajaymistry
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Joined: 10 Jun 2009
Posts: 22

PostPosted: Sun Aug 01, 2010 4:16 pm    Post subject: circular pile raft Reply with quote

Can anyone provide steps for inputting/analyzing/ designing Circular Piled raft foundation using Staad Foundation. ?
Eg: Raft thk= 4m and Dia=43.4m , 464 piles of 530mm dia (120ton capacity)
It is a raft for 220m tall RCC chimney.
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vk.wits
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Joined: 19 Aug 2011
Posts: 21

PostPosted: Sun Nov 25, 2012 5:59 pm    Post subject: how to apply checks Reply with quote

please tell how to apply check for one way shear ........... i had deigned raft as per two way shear but can u please tell me the step by step check for one way shear
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