Definition of plinth beam & tie beam and differences among them
Plinth Level: It belongs to the finished ground level on which the building or structure stands.
It is built up higher to some extent as compared to the Ground Level in order to resist the penetration of water into the building. As a result, the drainage system is installed without any difficulty.
Definition of Plinth Beam - The beam that is erected at the plinth level is called Plinth Beam.
In frame structure building, the Plinth Beam binds all the column of the structure to minimize the slenderness ratio of the columns.
Reinforcement is provided based on the structural design.
At least 2 main bars with 10 mm diameters should be applied at top and bottom for its construction.
It is not obligatory to provide reinforcement for the plinth beams.
It can also be non-reinforced. The height of plinth beam may differ. Its height is selected on the basis of the structural requirements. However, It’s breadth is identical to the breadth of the wall.
Occasionally, it can also be a little thicker compared with the wall thickness.
Benefits of Plinth Beam:
1. Plinth beam resists differential settlement in structures since all the load operating on the plinth beam is transmitted consistently to the foundation.
2. It controls the dampness so that it can’t penetrate into the building from foundation.
3. It binds all the columns.
4. It avoids cracks from foundation to get to the wall.
5. It safeguards the building against collapsing throughout an earthquake.
6. Plinth Beams allocates the load uniformly.
What is a Tie Beam? - Tie beams are useful when the height of the roof is elevated as compared to the normal height of the structure.
They function as a length breaker in the columns. Tie Beam attaches two or more columns to minimize their effective length as well as their slenderness ratio. In several cases, the tie beams are arranged over the plinth level and in roof trusses.
They never transmit any type of load rather they minimize the effective length of columns. A tie beam is useful when the height of the column is raised from the range of 4 to 5 meters. But, it is not static, the designer can modify it as per their requirements.
Benefits of Tie Beams:
1. The purpose of tie Beam is to bear the axial compression.
2. To minimize the effective length of the Column.
3. They protect the column against buckling.
4. Tie Beams minimize the slenderness ratio.
Variations among Plinth Beam and Tie Beam
The plinth beam is erected at the plinth level whereas the tie beam is erected at the elevation or over the plinth level. The construction method is identical for both the beams. Both are designed as per the requirements of the project.