Variations among primary beam, secondary beam and tie beam
Primary Beam: Primary beam stands for a horizontal beam that joins columns (simply supported or shear connected) to transmits the load of a structure from secondary beam (when exist) to the columns right away.
Generally, primary beams are found in a regular building structure. The depth of the primary beams remains higher as compared to secondary beams. Primary beam functions as a medium among columns and secondary beams.
Secondary Beam: It belongs to a horizontal beam that joins primary beams (simply supported or shear connected) to transmit the loads of a structure to the primary beam. It is not directly attached to the columns.
The purpose of these beams is to support and minimize the deflection of beams and slabs.
Tie Beam: It belongs to a horizontal beam that joins two rafters in a roof or roof truss to transmit the load of the rafter to the column of the structure as well as tighten the entire building structure.
Normally, it is found in roof truss.
? Tie beam normally binds the columns and foundation at certain level
? Plinth beam at Plinth level
? Ground beam at Existing ground level