Title:
Practical Calculation of Two-Way
Slab Deflections
Author(s):
Andrew Scanlon and David W. Murray
Publication:
Concrete International
Volume:
4
Issue:
11
Appears on pages(s):
43-50
Keywords:
concrete slabs; cracking (fracturing);
creep properties; deflection; flexural strength; modu-lus
of elasticity; reinforced concrete; shrinkage; two-way
slabs.
DOI:
Date:
11/1/1982
Abstract:
Presents methods for calculating deflections of two-way slabs. Both hand-calculation and computer-aided procedures, suitable for use in a design office, are given. Cracking due to restrained shrinkage and thermal movement is included by combining effects of restraint stresses and applied loads in calculating cracking moment at a section. The calculation procedures are based on Branson’s effective moment of inertia approached as outlined in the ACI Building Code. The proposed hand-calculation procedure is based on standard beam deflection formulas using design moments calculated by the equivalent frame method or direct design method of the ACI Building Code. For cases where a more sophisticated analysis is required, a finite element ap-proach using available computer programs is given.*