In post-tensioning, what is the primary purpose of adding bars and supports?

In post-tensioning, adding bars and supports primarily serves the purpose of providing stability during jacking operations. When tensioning cables within a concrete element, it is essential for the structure to maintain its integrity under the forces generated by the tensioning process. The bars and supports hold the cables in the correct position and help to ensure that the stresses are distributed evenly throughout the concrete. This stabilization is crucial to prevent any unintended movements or distortions that could compromise the structural performance of the element being tensioned.

While considerations for aesthetics, thermal insulation, and corrosion prevention are important for various construction applications, they do not directly address the immediate mechanical needs during the post-tensioning process. Stability and proper alignment during jacking are key to ensuring that the tensioning is effective and that the concrete maintains its designed properties and performance.