Crack Control in Post-Tensioned One-Way Slab Systems

Abstract

This paper presents an alternative procedure for computing restrained stresses induced by shrinkage and temperature effects. A method is proposed by which an equivalent shrinkage stress is calculated. The stress obtained is then used to design the shrinkage and temperature tendons. The equivalent shrinkage stresses calculated considering the restraint acting on the slab provided by elements such as columns and shear walls. The results show that this restraint, which is a function of the respective stiffness of the restraining elements, is very significant and its effect must be considered if shrinkage and temperature cracking is to be effectively controlled by either tendons or mild steel reinforcement.