There are various types of beams used for construction of various types of buildings, here we will learn the major difference between tie beam and plinth beam.
A beam is a horizontal member provided to transfer loads from the higher structure to the column and walls or foundations, it could transfer both dead loads and live loads.
The finished floor level at which the building or structure rests is called the plinth level, its construction being slightly increased than the ground level.
The ground level is the natural surface of the earth on which it builds.
The primary purpose plinth level is kept above floor level is to prevent water from coming into the building, due to which drainage system can be easily installed.
As a result, there will likely be a difference in ground and plinth levels.
Plinth beam vs. Tie beam:
What is Plinth Beam?
The beams constructed on the plinth level often known as plinth beams also called as non-reinforced.
In frame structure construction, the plinth beam ties all of the columns of the structure to reduce the slenderness ratio of the columns.
Reinforcement is used according to the structure design, however, a minimum of two main bars above and under 10 mm diameter is used for its construction.
However, reinforcing the plinth beam is not necessary.
Function of Plinth Beam:
- Plinth beam prevents differential settlement in buildings as a result of all the load on the plinth beam is uniformly transferred to the foundation.
- It prevents moisture from foundation to enter within the building.
- It ties all of the columns.
- This prevents cracks from the foundation from reaching the wall.
- It prevents the building from falling during an earthquake.
- Plinth beams distribute the load evenly.
What is a Tie Beam?
When the ceiling height exceeds the normal height of the structure, this beam is provided.
They act as a size breaker within the column.
The tie beam connects the two or extra columns to reduce their efficient size and reduce their slenderness ratio.
Mostly, tie beams are provided above the plinth level and within the roof trusses, they do not transfer any load, they only reduce the efficient size of the columns.
A tie beam is recommended when the height of the column will increase from four to five meters.
Whereas this is not the exact number to be considered, designers can change it to suit their needs.
Function of Tie Beams:
- Tie beams are used to carry axial compression.
- To reduce the efficient size of the column.
- They prevent the column from buckling.
- Tie beams reduce the slenderness ratio.
Difference between tie beam and plinth beam:
|Plinth beam||Tie beam|
|It comes in ground level.||It can come at any level of the structure.|
|It provides the level difference between the formations to inside floor level.||It provides the level difference between the formations to inside floor level.|
|Plinth beam retains the filled soil inside the building.||Tie beam can come below the ground or above the ground.|
|It provides a base for the brick work.||It act as a stiffener to the columns.|
|It distributes the load on all footings.||Tie beam does not carry vertical load of slab or walls but take axial compression load.|
The main difference is that the plinth beam is constructed at the plinth level and the tie beam is constructed at or above the plinth level.