ABSTRACT
The stress and strain in a reinforced or prestressed concrete structure are subject to change for a long period of time, during which creep and shrinkage of concrete and relaxation of the steel used for prestressing develop gradually. For analysis of the time-dependent stresses and deformations, it is necessary to employ time functions for strain or stress in the materials involved. In this chapter the basic equations necessary for the analysis are presented. The important parameters that affect the stresses or the strains are 2included in the equations, but it is beyond the scope of this book to examine how these parameters vary with the variations of the material properties.
