volumetric change induced stresses

Concrete shrinkage is a volumetric phenomena that manifests differently in different shapes. For large masses of concrete such as large square or round columns, the shrinkage is more uniform. In thin section members, the manifestation is perpendicular to the thin section, thus greater appearance of cracking in flatwork. Often this is simply a concentration of strain in two dimensions that occurs orthogonally, but results in tighter cracks (sometimes not visible to unaided eye)in thicker members.

Keep in mind that shrinkage is a function of the mix design. You might have several different mixes being used in the same building. You will not have uniform shrinkage among the different mixes. Many issues in a mix design affect the shrinkage...aggregate type and size, cementitious material content, water-cement ratio, air content....all of these will affect the amount and type of shrinkage that will occur. Balancing shrinkage strains in a large building could drive you nuts!