Title: ACI Code Deflection Requirements-Time for a Change?

Author(s): K. B. Bondy, FACI

Publication: Symposium Paper

Volume: 225

Issue:

Appears on pages(s): 133-146

Keywords: code; computations; deflection; slabs

DOI: 10.14359/14381

Date: 3/1/2005

Abstract:
This paper critically examines the deflection criteria in Chapter 9 of the current ACI Building Code, ACI 318-02, with a particular focus on two-way non-prestressed slabs. The relationship between criteria based on deflection computations and arbitrary minimum thicknesses, which are independent of loading and concrete strength, are scrutinized. A numerical example is presented in which it is demonstrated that current code criteria can lead to unsatisfactory performance in heavily loaded slabs. Recommendations are made for changes to improve code deflection criteria.