Abstract
In the ordinary creep problems on reinforced and prestressed concrete structures, the creep and shrinkage of concrete only in one direction have been considered in analysis. However, the creep and shrinkage of concrete in two dimensions, such as the plastic flow in walls or slabs, must be considered in analysis if we wish to bring the theoretical solutions of the creep stresses or strains in the actual structures into agreement with experiments. In this report, two well-known laws fundamentally expressing the creep phenomenon of concrete, that is, Davis-Glanville's law and Whitney's law, were extended to the creep in two dimensions and the general theorem of two dimensional creep was defined under the assumption that the elastic and creep properties of concrete under two dimensional stresses are the same in all directions. As a special example, the shrinkage stress analysis was made on a reinforced concrete rectangular plate with no edge restrictions. Also, the general solution of two dimensional creep problems was derived on a plain concrete plate.
