In numerous structures , continuity between two adjacent members necessary even though the members meet angle. The joint formed from this meeting usually refers to the "corner". The term "corner" in this investigation is used to describe a corner joint formed by the joining; at 90 degree, of the ends of two flexural members. The terms "opening" and "closing" the corner are used to describe the increase and decrease of this right angle, respectively. Concrete corners are found in wide variety of structures such as retaining wall, bridges and portal frame buildings. They are also common in the field of hydraulic structures, such as reservoirs, tanks, flumes and culverts. Design of the straight members which intersect to form the corner is part of the basic training of the engineer.