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Basement retaining wall
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deepak_ed
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Joined: 22 May 2013
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PostPosted: Wed May 22, 2013 9:44 am    Post subject: Basement retaining wall Reply with quote

Dear SEFIans,
While designing a retaining wall for abasement, suppose the roof slab rests on the wall tip. Then how the cantilever retaining wall is analysed and designed ?

Deepak ED,
Trichur
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sknsrinivasan
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Joined: 15 Apr 2013
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PostPosted: Wed May 22, 2013 10:27 am    Post subject: Reply with quote

Dear Deepak

The bottom of the Retaining Wall is fixed and top of the wall is Pined  This proped cantilever condition You should analysis like this in softwere after that you design in working stress method

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N.Srinivasan
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es_jayakumar
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PostPosted: Wed May 22, 2013 11:01 am    Post subject: Reply with quote

Sir,

How is the basement slab connected to this retaining wall designed ? Which text book does cover such designs in detail ?

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Jayakumar
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sknsrinivasan
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PostPosted: Wed May 22, 2013 11:50 am    Post subject: Reply with quote

Dear

I think the bottom of the wall connected by footing that is Fixed The top of wall connected by slab. In STAAD how you will give support condition when the slab Resting on the Retaing wall  I think Pined one  Like that I Mentioned

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N.Srinivasan
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Dr. N. Subramanian
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PostPosted: Wed May 22, 2013 3:31 pm    Post subject: Reply with quote

es_jayakumar wrote:
Sir,

How is the basement slab connected to this retaining wall designed ? Which text book does cover such designs in detail ?

Regards,
Jayakumar
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Dr. N. Subramanian
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PostPosted: Wed May 22, 2013 3:34 pm    Post subject: Reply with quote

Dear Er Jayakumar,

The Coulomb theory developed in 1773 and the Rankine's theory developed in 1857 are still used in the design of retaining walls. Strictly speaking they are valid only when the back fill material is granular. Moreover they assume that the wall moves in order to generate the earth pressure. In the case of basement wall, the top and bottom are connected to slabs and hence will not move. Hence we need to use lateral earth pressure at rest, as given by Terzaghi in 1934- K0 =[1-sin (phi)]  The lateral restraint provided by the two slabs at the top and bottom may be considered as simply supported.

Best wishes,
NS

es_jayakumar wrote:
Sir,

How is the basement slab connected to this retaining wall designed ? Which text book does cover such designs in detail ?

Regards,
Jayakumar
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sknsrinivasan
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PostPosted: Thu May 30, 2013 6:24 am    Post subject: Reply with quote

Dear NS sir

Bottom of wall is fixed And Top wall is pined Whether this support condition is correct or wrong While designing Retaining wall or Both ends are pined Is correct As per your statement

Thanks
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N.srinivasan
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P.K.Mallick
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PostPosted: Thu May 30, 2013 7:08 am    Post subject: Reply with quote

What is the load transfer mechanism of top slab ? Is the slab load directly transferred to retaining wall or it is transferred to column through beams and retaining wall tip is connected to beam ?
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sknsrinivasan
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PostPosted: Thu May 30, 2013 7:16 am    Post subject: Reply with quote

Dear

slab load directly transferred to Retaining wall

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N.S
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P.K.Mallick
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PostPosted: Thu May 30, 2013 12:16 pm    Post subject: Reply with quote

Well assume both top and bottom of retaining wall as hinged and design the retaining wall for moment and axial load coming from slab.
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