Size of plinth beam for residential buildings upto G+3 storey | Reinforcement details | Civil tutor

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https://clpsheldon.page.link/x3kb In this tutorial i have discussed briefly about the size of plinth beam for residential buildings upto G+3 storey and also the reinforcement details.

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As we know, Plinth level is the level which lies at the end of the substructure and at the beginning of superstructure. The beam which is provided at the plinth level is known as plinth beam. This is the first beam constructed after the completion of foundation.
Plinth beams play an important role in a building structure. These provide a connection between the columns and hence prevent them from buckling. They prevent the extension or propagation of cracks from the foundation into the walls, when the foundation suffers from settlement.
Plinth beams distribute the load of superstructure over the foundation in an evenly manner. The size of plinth depends upon the lateral and axial loads acting on it. That's why it becomes necessary to provide the proper size of a plinth beam.
In addition to that we must know what quantity of steel should be provided for a particular size to avoid any cracks in the walls of the structure caused by any settlement.
In this lecture i have discussed what sizes of plinth beams should be provided in residential buildings upto G+3 storey as per thumb rule. I have also discussed about the details of steel reinforcement provided in each type of plinth beam.
If we want to construct ground floor only....the minimum size of plinth beam should be taken as 9'' x 9'' or 225mmx0.225mm
For this size of beam we should provide a minimum of 4 number of steel bars (2 at the top and 2 at the bottom) having a minimum dia 12mm plus tie bars/rings of size 8mm spaced at 150mm c/c.

For G+1 storey, the size of the plinth beam should be taken as 9''x12'' or 225mmx300mm
And we should provide a minimum of 5 number of steel bars... Out of which 2 number of bars of minimum dia 12mm at top, 2 no of 12mm bars at bottom and one extra bar of 10mm dia at the bottom plus tie bars/rings of size 8mm spaced at 150mm c/c

For G+2 storey, the beam size should be taken similar to the G+1 storey building i.e, 9''x12'' or 225mmx300mm
And we should provide 5 number of steel bars.... Out of which 2 number of 12mm bars at top and 3 number of 16mm bars at the bottom.... plus tie bars/rings of size 8mm spaced at 150mm c/c

The same size should be taken for G+3 storey building i.e, 9''x12''
And we should provide 2 number of 16mm bars at top, 2 number of 16mm bars at bottom and 2 extra bars of dia 12mm at the centre of the main bars
Again the tie bars/rings of size 10mm spaced at 150mm c/c

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