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Regarding Design of Plinth Beam
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khaja092
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PostPosted: Sat Feb 20, 2021 7:30 pm    Post subject: Regarding Design of Plinth Beam Reply with quote

It can be designed as normal beam
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Ujjwal
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Joined: 07 Apr 2009
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PostPosted: Sun Feb 21, 2021 2:23 pm    Post subject: Plinth Beam Reply with quote

Ujjwal wrote:
someshwar ganti wrote:
I feel that a Plinth beam cannot be designed as a Normal Continuous beam like that in a Roof beam.

1. the Plinth beam is Normally casted on a CRS masonry, which gives it support through out the length of the BEAM hence our normal BM equations will not really apply,  

   Please note for a roof beam the wall is constructed much later hence normal equations apply.


Besides the Wall load on the plinth beam, most of the sites (especially factory sheds etc) will have tractors, tippers running on the some of the bays of the plinth beams, These beams survive only because there is a CRS wall supporting the beam through out.

hence in my opinion , design it as a normal beam because the construction loads on plinth beams (atleast in some bays ) is much higher than the wall load on the beams, in such a case the CRS support below the beam will prevent the deflection etc hence the failure.
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Dr. N. Subramanian
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PostPosted: Sun Feb 21, 2021 7:39 pm    Post subject: Reply with quote

Even if there are openings are there you can consider composite action- for windows you will have 2.5 feet brick wall and there will not be doors in the outside walls. You can't take 4.5 inch wall to give composite action.
Best wishes
NS


quote="hishamajmalpc"]Sir,
Most of the cases there will be openings in wall (Doors/windows). Can we assume composite action in those cases?[/quote]
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