The Calculation of Deflections of Reinforced Concrete Members -A Rational Approach

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: The Calculation of Deflections of Reinforced Concrete Members -A Rational Approach

Author(s): Heinrich Trost

Publication: Special Publication

Volume: 76

Issue:

Appears on pages(s): 89-108

Keywords: beams (supports); cracking (fracturing); creep elasticity; moments of inerti bending moments; concre properties; deflection; a; reinforced concrete; te slabs; modulus of shrinkage; structural analysis.

Date: 10/1/1982

Abstract:
The proposed calculation procedure is based on a reference deflection at the interesting point of the uncracked concrete member. This reference deflection is calculated on the basis of the existing distribution of the gross section stiffness-in analogy to the usual determination of the design forces in statically indeterminate systems-- as available from tables or handbooks. Then this reference value, either for the maximum service load or for the sustained load when time-dependent effects are concerned, is multiplied by reinforcement-dependent coefficients given in figures or calculable from closed formulae in order to obtain the initial deflection and the time-dependent deflection due to creep and shrinkage. The probable deflection, as the prognostic value of interest and in which the deflection-reducing effect of the reinforcement and the tension stiffening is considered, is determined by interpolation between the deflections in the limit states according to the acting moment level.