A path to more versatile code provisions for slab deflection control

Abstract

An assessment of the methods of codes ACI 318 and Eurocode 2 is performed to establish a minimum slenderness for reinforced concrete slabs, which is a simplified method for controlling the deflection of slabs. This assessment is performed by comparing these methods with each other and with two further methods that have inspired, among others, the Australian standard for concrete structures. The variables evaluated include those that most influence deflection control (span, load and allowable deflection). The study cases include spans that range from 6 m (20 ft) to 12 m (40 ft) and loads that range from 5 kN/m2 (104 lb/ft2) to 15 kN/m2 (313 lb/ft2). The results of the study reveal some of the key advantages and shortcomings of the ACI 318 and Eurocode 2 provisions. Suggestions are provided to improve the current provisions of the codes. Methods that are not too complicated but more refined can help the code provisions to become more versatile. The aim of this work is to minimise potential problems caused by designing excessively thick slabs (heavy and pollutant) or excessively slender slabs (too deformable).