Difference between Plinth beam and tie beam

Plinth beam and tie beam are often interchanged and confused. Even civil engineer get confused with plinth beam and tie beam. In this post we will look in detail about plinth and tie beam.

Plinth Beam

Plinth beam is a beam that is provided at the plinth level. Usually plinth beam is the beam that is constructed above the ground level after foundation.

What is Plinth Level

Plinth level is the top most level of ground level that is where sub structure ends and super structure starts.

Tie Beam

Tie beam does not transfer load from beam to columns but they are used to connect two or more columns or rafters.

As the Tie beam name itself suggest that it ties column, thus tie beam is a beam that ties column in a building with high floor levels.

Tie beams are provided in roof truss and at plinth level. Thus tie beam don’t transfer load but act as length breaker in columns.

Difference Between Plinth Beam and Tie Beam

Purpose of Plinth Beam

  1. Load of walls are transferred to foundation through plinth beams.
  2. Plinth beam prevent cracks from foundation to walls due to settlement or any other reasons.
  3. If due to any reason there is differential settlement then plinth beam helps in avoiding settlement.
  4. Plinth beams connect all columns.

Purpose of Tie Beam

  1. Tie beam carry axial compression.
  2. Column buckling can be prevented by using tie beams.
  3. Rafter loads are transferred to the column.

What is Difference Between Plinth Beam and Tie Beam

Truly speaking there is not much difference between plinth beam and tie beam. Every plinth beam is a tie beam. But every tie beam is not a plinth beam.

Tie beam can be a plinth beam if it is provided at the plinth level. The only difference between plinth beam and tie beam is the level of height at which they are provided.

Thus plinth beam is provided at the plinth level and tie beam is provided at any level above plinth level and floor level.

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