Abstract
Investigation on circular hole void slab is executed to reduce the slab weight, in which cylindrical steel pipes or other materials are embedded in the center part of cross section in one direction. In my previous paper, the characteristics of the bending rigidity of the void slab and stress concentrations were confirmed and clarified by direct numerical method. This paper shows firstly that this ortho-tropic slab can be analytically treated as an isotropic slab. Subsequently, the differences of characteristics of elasticity, such as the vertical displacement, by the existence of the hole are described.