The ornamental design for a shelf with reinforcementribs, as shown and described.
FIG. 1 is a top perspective view of a first embodiment of the shelf with reinforcement ribs in accordance with one aspect of our new design;
FIG. 2 is a front elevational view of the first embodiment of the shelf with reinforcement ribs;
FIG. 3 is a rear elevational view of the first embodiment of the shelf with reinforcement ribs;
FIG. 4 is a right side elevational view of the first embodiment of the shelf with reinforcement ribs, with a left side elevational view being a mirror image thereof;
FIG. 5 is a top plan view of the first embodiment of the shelf with reinforcement ribs;
FIG. 6 is a bottom plan view of the first embodiment of the shelf with reinforcement ribs;
FIG. 7 is a top perspective view of a second embodiment of the shelf with reinforcement ribs in accordance with another aspect of our new design; and,
FIG. 8 is a top perspective view of a third embodiment of the shelf with reinforcement ribs in accordance with another aspect of our new design.