What Is Plinth?
The plinth is one type of level or base which supports superstructure walls, columns, and structures. The function of the plinth is to pressure and load evenly across a column over a wider space.The plinth is also used to elevate structures above the ground to ensure their protection from water and other surrounding elements.
Plinth beam is a reinforced concrete beam constructed between the wall and its foundation. Plinth beam is provided to prevent the extension or propagation of cracks from the foundation into the wall above when the foundation suffers from settlement
Height of Plinth
The plinth height is between 300 – 450 mm above ground level, it is advisable to the kept peak of 150 mm above the onsite ground level be adopted.
Purpose of Providing Plinth Beam
Following are the reasons for the providing the plinth beam,
These beams in the structures prevent differential settlement and all the loads on the plinth beams are transferred equally due to the foundation.
These beams prevent moisture from entering the building from the foundation.
These beams bind all the columns.
It prevents cracks from the foundation to the wall.
This prevents the building to collapse during an earthquake.
These beams distribute the load evenly.
Standard Dimensions of Plinth Beam
The width of the beam is usually 9 ″ or 225mm, as the wall width in India is 9 ″. So that the structure has a good look.
The minimum size of the RCC plinth beam should not be less than 9 “x 9” (225 mm x 225 mm), as a general rule of thumb.
The plinth beam size for a 1-story building is 9 “x 9” (225 mm x 225) mm) and is 9″x 12″ (225 mm x 300 mm) plinth beam sizes are used for 2 story (G + 1), 3 story (G + 2) and 4 story (G + 3) houses.
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