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Basement retaining wall
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Dr. N. Subramanian
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Joined: 21 Feb 2008
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Location: Gaithersburg, MD, U.S.A.

PostPosted: Thu May 30, 2013 2:19 pm    Post subject: Reply with quote

I agree with Er Mallick!

Best wishes
NS
P.K.Mallick wrote:
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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deepak_ed
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Joined: 22 May 2013
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PostPosted: Mon Jan 13, 2014 12:42 am    Post subject: Reply with quote

Sir,
The bottom of the retaining wall is to be supported on a plinth beam. Hence the beam will be subjected to moment in horizontal direction due to the horizontal thrust arising out of earth pressure, transferred by the retaining wall, in addition to vertical moment created by self weight of wall. How to design the plinth beam for the dual moments acted ?

Rgds,
Deepak
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Dr. N. Subramanian
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Joined: 21 Feb 2008
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Location: Gaithersburg, MD, U.S.A.

PostPosted: Mon Jan 13, 2014 12:53 am    Post subject: Reply with quote

Dear Er. Deepak
The horizontal trust will act as torsion in the beam. Hence the beam has to be designed for this torsion combined with vertical bending.

You can provide a horizontal slab to take care of the horizontal trust of retained earth, and in such a case the plint beam can be designed for only vertical load.

Best wishes
NS

deepak_ed wrote:
Sir,
The bottom of the retaining wall is to be supported on a plinth beam. Hence the beam will be subjected to moment in horizontal direction due to the horizontal thrust arising out of earth pressure, transferred by the retaining wall, in addition to vertical moment created by self weight of wall. How to design the plinth beam for the dual moments acted ?

Rgds,
Deepak
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deepak_ed
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PostPosted: Mon Jan 13, 2014 3:17 am    Post subject: Reply with quote

Sir,
Suppose the foundation is column footing and there is no slab at plinth  beam level. Then, in addition to torsion, there may be a bending moment also in horizontal direction in the plinth beam. Is it not ? How to tackle it ?

Regards,
Deepak
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deepak_ed
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PostPosted: Tue Jan 14, 2014 1:47 am    Post subject: Reply with quote

Sir,

The moment acted on the said plinth beam is similar to the stiffener beam (ring beam) of a pyramidal roof which both vertical and horizontal thrust are acted upon. How to design such a beam ?

Regards,
Deepak
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umeshrao
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Joined: 23 Aug 2010
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Location: Bangalore, India

PostPosted: Sat Feb 01, 2014 10:15 am    Post subject: Reply with quote

deepak_ed wrote:
Sir,
The moment acted on the said plinth beam is similar to the stiffener beam (ring beam) of a pyramidal roof which both vertical and horizontal thrust are acted upon. How to design such a beam ?
Regards,
Deepak


Dear Mr. Deepak,  Use SP16 column charts as if you are designing column for bi-axial moment and zero as P. Except that you will be using steel on both opposite faces is the same. However if the section is under reinforced then and you do not wish to have the same reinforcement then you can design it independently for the moment in each direction, if the section is under reinforced in both direction then compressive  stress at the corner will not exceed the permissible stress.
Umesh Rao
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