Title:
The Calculation of Deflections of Reinforced Concrete Members -A Rational Approach
Author(s):
Heinrich Trost
Publication:
Symposium Paper
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.
DOI:
10.14359/6786
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.