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2.10.11 | Detailing of Unbonded Post-Tensioned Structures to Minimize the Effects of Restraint to Shortening

While the numerical design of post-tensioned slabs are important, the detailing that allows the slab to shrink with minimal restraint is equally important, but is an often over looked aspect. The typical crack in a concrete slab is due to shrinkage or restraint and could have been avoided or minimized with proper detailing. This webinar will discuss the general philosophy of restraint to shortening (RTS) cracks in post-tensioned floor systems and how structural engineers have successfully used slip/release details, closure strips, layout of the lateral system and adjusted pour sizes to improve performance and appearance of the slab. Several common post-tensioning construction issues will be reviewed and how they can be addressed in the construction documents to minimize delays or additional costs in the field. In addition, several examples of how to locate existing tendons will be presented along with possible repairs if a tendon is damaged during or after construction.