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Effects of Post Tension design for Transfer Slab supports

 
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jrocky518
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Joined: 08 Oct 2018
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PostPosted: Mon Oct 08, 2018 4:17 am    Post subject: Effects of Post Tension design for Transfer Slab supports Reply with quote

Dear Sefians,
I have a load transfer system - shear wall to transfer slab to columns below (kindly refer section attached).

We are exploring and comparing the use of Post Tensioning and use of conventional rebars for the Transfer Slab reinforcement.

My doubt is, would the load transfer/distribution from shear walls to columns be affected by the post tensioning behaviour of the 3.3m thick transfer slab as opposed to conventional reinforcements?

Would the load and moment reactions of the columns below differ between Post Tensioned and Conventional Reinforcements?

If yes, kindly elaborate. Your input would be very helpful and highly appreciated.

Kind Regards, R. Jayakumar



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vegad
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Joined: 25 Dec 2013
Posts: 136

PostPosted: Mon Oct 08, 2018 6:50 am    Post subject: Reply with quote

Dear Jayakumar,

would the load transfer/distribution from shear walls to columns be affected by the post tensioning behaviour of the 3.3m thick transfer slab as opposed to conventional reinforcements?

No. For lateral loads, in plane stiffness of the transfer slab is what matters. For vertical load transfer, strut and tie model will play a crucial part.

Would the load and moment reactions of the columns below differ between Post Tensioned and Conventional Reinforcements?

No. How a transfer girder is strengthened has negligible say on supports, provided the overall strains are limited for both types of reinforcing methods.

Temperature effects shall matter.

However, using post tensioned method for a seismic critical element may result in reversals, hence design extremes.

Thank you.
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spsvasan
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Joined: 18 Dec 2008
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PostPosted: Sun Oct 14, 2018 3:10 am    Post subject: Re: Effects of Post Tension design for Transfer Slab supports Reply with quote

jrocky518 wrote:
Dear Sefians,
I have a load transfer system - shear wall to transfer slab to columns below (kindly refer section attached).

We are exploring and comparing the use of Post Tensioning and use of conventional rebars for the Transfer Slab reinforcement.

My doubt is, would the load transfer/distribution from shear walls to columns be affected by the post tensioning behaviour of the 3.3m thick transfer slab as opposed to conventional reinforcements?

Would the load and moment reactions of the columns below differ between Post Tensioned and Conventional Reinforcements?

If yes, kindly elaborate. Your input would be very helpful and highly appreciated.

Kind Regards, R. Jayakumar



Dear Er.R.Jayakumar

I feel that the axial shortening of the prestressed transverse girder can induce some additional bending moments in the columns below. i do not know how large these moments will be

By the by, the latest IS 13920 prohibits the supporting of shear walls on columns

S.P.Srinivasan
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