SLABS by using Direct Design Method as specified in IS 456:2000, total negative and positive BENDING moment FOUND are distributed across the panel width in column strip, which is given below in the tabulated form:Distributed MomentPercentage of Total MomentNegative BM at Exterior Support100Negative BM at Interior Support75Positive BM60 The moment in the middle STRIPE shall be the difference between panel MOMENTS and the column strip moments calculated as above.Note:The portion of the flat slab that is bound on each of its four sides by center lines of adjacent columns is called a panel. A panel may be divided into column strips and middle strips. Column Strip means a design strip having a width of 0.25L1 or 0.25L2, whichever is less, where L1 and L2 are length and width of the panel. The remaining middle portion which is bound by the column strips is called the middle strip.