RIB OPTIMIZED SLAB

PURPOSE: A ribbed PC slab with an optimized cross section is provided to effectively treat positive and negative moment applied to the slab. CONSTITUTION: A ribbed PC slab with an optimized cross section is comprised as follows. A center portion of the PC slab is composed of an upper flange and multiple center ribs. The center ribs are protruded downward from the upper flange to be parallel to each other. Both ends of the PC slab are composed of lower flanges(13) and multiple end ribs(14). The lower flanges have the same width as the upper flange. The end ribs are extended outward from both ends of the center ribs and are protruded upward from the lower flanges. Multiple pocket spaces(P) are formed in both ends of the PC slab, and the tops thereof are open. Multiple block-out spaces(B) are formed in the center portion, and the bottoms thereof are open.