Deflections of flat plate floors with irregular column layout

S. Teng, Tavio

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)


A procedure for calculating the instantaneous deflections of irregular reinforced concrete flat plate floors is presented. The method is applicable throughout the entire loading stages from the uncracked state to the fully cracked state and even up to the ultimate limit state. Based on the familiar effective moment of inertia approach, the proposed procedure also uses the ACI Direct Design Method with some generalization. The total static moment in a particular design strip will be distributed to the midspan and support sections according to the distribution coefficients of the ACI Direct Design Method, taking into account column sizes and irregularity of slab geometry around the edge slab-column connections. At high loads, the modulus of elasticity of the concrete can be reduced to better reflect the nonlinear behavior of concrete slabs. The definitions of effective span, width of design strips, torsional rigidity of transverse torsional members, and column sizes and orientations will be generalized as far as practical. The accuracy of the proposed procedure has been compared with measured deflections of two multiple-panel irregular flat plate floors tested at Nanyang Technological University - Singapore. The comparison between the calculated deflections and the experimental values shows that the proposed procedure is reasonably accurate.

Original languageEnglish
Title of host publicationDeflection Control for The Future
EditorsN.J. Gardner
PublisherAmerican Concrete Institute
Number of pages28
ISBN (Electronic)9780870311079
Publication statusPublished - 1 Feb 2003
Externally publishedYes
EventDeflection Control for The Future at the 2002 ACI Spring Convention - Detroit, United States
Duration: 21 Apr 200226 Apr 2002

Publication series

NameAmerican Concrete Institute, ACI Special Publication
ISSN (Print)0193-2527


ConferenceDeflection Control for The Future at the 2002 ACI Spring Convention
Country/TerritoryUnited States


  • Column strip
  • Concrete slabs
  • Deflection
  • Design strip
  • Flat plates
  • Floors
  • Irregular column layout
  • Middle strip


Dive into the research topics of 'Deflections of flat plate floors with irregular column layout'. Together they form a unique fingerprint.

Cite this