Plinth Beam Constructions, Reinforcement details. In Construction building, Plinth beam is major place. Plinth beam is a reinforced concrete beam constructed between the wall and its foundation. Horizontal members transfer the load from the upper structure load to column and walls Transfers dead loads and live loads.
Plinth Beam Construction, Reinforcement Details
Plinth beam is an RCC member that separates the Superstructure and the substructure. distributes loads from columns and walls which are above ground level that includes columns, beams, slabs, masonry walls. Know more detailed information on the reinforcement & Concreting of Plinth Beam/tie beam/curtain wall/base wall etc. Know more about Plinth Beam and it uses. The beam is placed over the foundation. places on ground level means plinth level area. The beam is built up at ground level.
The condensed soil is used to fill the empty space between the foundation and plinth level. Brick or stone masonry is generally developed under the plinth beam.
Plinth beam Load Distribution
Plinth beam is provided to prevent the extension or propagation of cracks from the foundation into the wall above when the foundation suffers from the settlement. Plinth be a distributes load of the wall over the foundation evenly. Foundations are exposed to differential settlement when the soil underneath is not compacted perfectly. A differential settlement leads to cracks in the masonry walls.
Plinth beam is provided to prevent the extension or propagation of cracks from the foundation into the wall above when the foundation suffers from the settlement. Plinth beam prevents differential settlement in structures because all the load coming on the plinth beam is uniformly transferred to the foundation. by this plinth beams Load carrying capacity of columns also depends on slenderness ratio.
The slenderness ratio is derived from the unsupported length of the column to cross-sectional area of the column. To prevent drainage water or stormwater entering the house from outside, plinth is constructed in such a way that the top of the plinth is sufficiently above road level. plinth functions as a tie, as a beam at ground level itself. RCC plinth beams are very useful to resist earthquake easily so they are mostly recommended to develop any building. Reinforcement bars should be protected by 25mm concrete cover. As far as stirrups are concerned, stirrup diameter should be at least 6mm and a spacing of 15cm should be sufficient.
Load bearing strength of columns is based on slenderness ratio. Slenderness ratio is obtained from unsupported length of column to cross sectional area of column. Plinth level should remain over the adjoining road level to stop the penetration of your house in the rainy season. The perfect plinth height should be 1.5ft to 2ft high as compared to road level. Foundations are exposed to differential settlement when the soil underneath is not compacted perfectly.
A differential settlement leads to cracks in the masonry walls. Plinth beam belongs to an integrated structural member and it facilitates minimizing the differential settlement in the structure. The reinforcement of beam must in proper alignment. If span of beam is more than 6 to 9 meter than camber should be provided as per structure design. Always check whenever the reinforcement of cantilever beam is in top doubly anchored. ensure that at junction of beam column is tight and it shouldn’t bulge during concreting. Plinth beams are generally set up in the situation where the foundations are little deeper and consequently they perform like a bracing or tying element. Plinth beam helps in evading differential settlement in a building because all the load of the wall is borne by the plinth beam Plinth beam is very useful in earthquake-prone areas. Besides, it is also built up over the natural ground. The strength of plinth beam concrete shall not be smaller than 20MPa.
If concrete is blended by hand, then additional 20% cement should be included to the mixture. A least depth of plinth beam is 20cm while its width must be similar with the width of final course of the foundation. To prevent drainage water or stormwater entering the house from outside, plinth is constructed in such a way that the top of the plinth is sufficiently above road level. Plinth beams are very useful to resist earthquakes easily so they are mostly recommended to develop any building.
For boulder-packed foundation in loose soil, RCC plinth is suitable to transmit load perfectly.plinth beam is constructed at the plinth level and the tie beam is constructed at the elevation or above the plinth level. It is recommended to provide two bars with minimum diameter of 12mm at the bottom of the beam. Similarly, two bars with a minimum diameter of 10mm shall be provided at the top of the plinth beam. Plinth beam minimum requirements, standard size requirements Online.
Reinforcement bars should be protected by 25mm concrete cover. As far as stirrups are concerned, stirrup diameter should be at least 6mm and a spacing of 15cm should be sufficient.
Plinth beam A plinth is the base or platform upon which a column of the structure rests this is part of structure which transfers load to adjacent columns. Plinth beam is provided to support wall above it and acts as tie beam for the column.
In soft and water-logged soil if earth settles downward plinth may also face uneven settlement. In R.C.C frame structure plinth acts as a tie, as beam at ground level. These plinth beams are also recommended for their earthquake-resistant properties.
Precautions for Ground Beam & Plinth Beams.
Plinth beams are fully prepared for concreting, reinforcement is completely bonded but the proper method should be must examining in the following two phases. check formwork before you allow placing of reinforcement. The Plinth beam rests on backfilled soil, the stability and compactness of the soil to be ensured to prevent saggingof the beam under concrete load. Plinth beam is constructed at ground level. The void between the foundation and plinth level is filled with compacted soil, this is to prevent sagging of the beam and provide a good foundation for the rest of the formwork.
- PCC Must should be properly leveled and in perfect line with appropriate grade thickness.
- Check the size of the beam before tying or placing reinforcement.
- Soil is properly compacted to that ground beam.
- P.C.C. shall extend a minimum 50 mm beyond the width of beam on both faces.
- The shuttering should be dry and shall be cleaned carefully before applying mould release agent.
- The reinforcement of beam must in proper alignment.
What is the use of plinth beam ?
plinth beam is to avoid differential settlement in a building this is due to the reason that all the load of the wall is than carried by the plinth beam underneath.
How do I calculate steel in plinth beam?
d^2/162 is the formula to know the 1m length of a steel
Why do we need plinth beams?
Columns transfer the load to the foundation. The load carrying capacity of a column for a given cross section depends upon its slenderness ratio. Slenderness ratio is derived from unsupported length of column and cross section of the column.