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Raft Foundation with Beams in CSI Safe Software
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sukanta.adhikari
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Joined: 26 Jan 2003
Posts: 726

PostPosted: Fri Jun 25, 2021 2:45 pm    Post subject: Reply with quote

Dear Anirudh,

I have used SAFE few years before. Right now I am not having the license ,so I am not able to use it.

SAFE approach is different from STAAD. In STAAD ,we  use plate element to model the raft and beam  to model the connection between columns at raft level.

But in SAFE ,I remember in  the training the raft was modelled with shell/element and instead of beam... the connection between column was also done using same shell/element used to model the other portion of raft. The thickness of shell/element  connecting the  columns were locally made  thicker, since beam depth will be more than other portion of raft. But a beam was not used.

I forget the reason. You can contact CSI for help.

Regards
S Adhikari



Anirudh4569 wrote:
Dear sir,
I have monolithically modelled raft foundation with beams in safe. The supports i have applied as soil supports with subgrade modulus.
vikram.jeet wrote:
Dear Er
If analysis is carried considering foundation input as base pressure instead of springs, may please see the output , probably it may match nearer to yr manual calcs.

Also in case of springs, pl check the value of modulus of subgrade reaction entered .  If value is that of rock , then also , I feel , the rock springs in vicinity of rcc columns share and beams do not reflect.

Just a generic view
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Anirudh4569
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Joined: 14 Jun 2021
Posts: 8

PostPosted: Tue Jun 29, 2021 11:16 am    Post subject: Reply with quote

Ok sir Thankyou for your response.
sukanta.adhikari wrote:
Dear Anirudh,

I have used SAFE few years before. Right now I am not having the license ,so I am not able to use it.

SAFE approach is different from STAAD. In STAAD ,we  use plate element to model the raft and beam  to model the connection between columns at raft level.

But in SAFE ,I remember in  the training the raft was modelled with shell/element and instead of beam... the connection between column was also done using same shell/element used to model the other portion of raft. The thickness of shell/element  connecting the  columns were locally made  thicker, since beam depth will be more than other portion of raft. But a beam was not used.

I forget the reason. You can contact CSI for help.

Regards
S Adhikari



Anirudh4569 wrote:
Dear sir,
I have monolithically modelled raft foundation with beams in safe. The supports i have applied as soil supports with subgrade modulus.
vikram.jeet wrote:
Dear Er
If analysis is carried considering foundation input as base pressure instead of springs, may please see the output , probably it may match nearer to yr manual calcs.

Also in case of springs, pl check the value of modulus of subgrade reaction entered .  If value is that of rock , then also , I feel , the rock springs in vicinity of rcc columns share and beams do not reflect.

Just a generic view
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View user's profile Send private message
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