Before starting the difference between plinth beam and tie beam, let me clear one important term which will help you further.
It is the level where the sub-structure ends and superstructure starts. In si simple words it is the topmost level of ground level. (refer to the below image)
What Is Plinth Beam?
The beam which is provided at the plinth level is called plinth beam. In framed structure, this beam is the first beam constructed after foundation.
Purpose Of Plinth Beam:
1. To distribute loads of walls over the foundation.
2. To connect all the columns.
3. To prevent cracks from the foundation to the wall.
4. To avoid differential settlement.
What Is Tie Beam?
The beam which connects two or more columns/rafters in a roof/ roof truss or in any height above floor level is called tie beam. Tie beams are mainly provided in roof truss and at plinth level. These beams do not convey any floor loads and only act as length breaker for columns where the floor height is unusually high.
Purpose Of Tie Beam:
1. To carry axial compression.
2. To transfer the rafter’s load to the column.
3. To prevent columns from buckling.
Difference Between Plinth Beam And Tie Beam:
Now coming to their differences. Actually, there is no difference between them. Tie beam is also a type of plinth beam. When tie beam is provided at plinth level it is known as plinth beam. That means the only difference is the height at which they are provided.
Plinth beam is only provided at plinth level but tie beam is provided anywhere above the plinth level and floor level.
I hope you all now understood the difference.
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