# Calculation of Deflections in Reinforced Concrete Flexural Members

*Design curves and formulae are presented for the calculation of deflections in reinforced concrete flexural members. These are based on the procedure given in appendix A of CP110 for direct calculation of curvatures and deflections due to short-term and long-term effects. Using the design curves as the basis, an estimate of the errors introduced by the simplifying assumptions presently used in deflection calculation is obtained, and the area of validity of these assumptions is defined. The need for a more realistic assessment of deflections and the use of the design curves are illustrated by an optimum design example. The advantage of the design formulae and the associated curves in deflection calculations is illustrated by considering a doubly reinforced member.
D.J. Gunaratnam*