Simplified prediction of deflections - Concrete Structures: Stresses and Deformations - page 303

Simplified prediction
of deflections

Long-term deflection and cracking of a reinforced concrete slab. A test series conducted at
the Swiss Federal Institute of Technology, Lausanne.

9.1 Introduction
In many practical situations, designers are interested in prediction of prob-
able maximum de ections of reinforced concrete members. Accuracy in pre-

diction is often of little or no concern. For this purpose, two methods are
presented in this chapter for prediction of maximum de

fl

fl ections of reinforced

concrete members, accounting for long-term e ects of creep and shrinkage.

We are here concerned only with the transverse de

ff

fl ection associated with

curvature in simple or continuous members subjected to bending moments

with or without axial forces. Prestressed beams are treated as reinforced con-
crete members for which the magnitude of the axial force and the bending

ψ