The ornamental design for a transitionstripcornerstructure, as shown and described.
FIG. 1 is a front isometric view of an ornamental design for a transition strip corner structure configured to perpendicularly align and cover the ends of two transition strips on a base surface;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a right side elevation view thereof; and,