b) Each middle strip shall be proportione d to resist the sum of the moments assigned to its two half middle strips. cl The middle strip adjacent and parallel to an edge supported by a wall shall be proportioned, to resist twice the moment assigned to half the middle strip corresponding to the first row of interior columns. Stiffness calculation: let the height of the floor = 4.0 m clear height of the column = height of floor depth of drop thickness of slab thickness of head.
= 4000 140 285 300 = 3275 mm Effective height of column = 0.8 x 3275 = 2620 mm (Assuming one end hinged and other end fixed) stiffness coefficient K K sum of flexural stiffness of colum n acti ng at the joint c c flexural stiffness of the slab Longer span s E EI EI EI E K L L L L 3 4 2 4 520 10 4 4 4 4 50 2 2 12 327.5 c BOTTOM TOP E K E K K E From table 17 of IS: 456-2000 3 4 660 28.5 2 4 1587.73 1.39 12 560 4 2273.5 c S C s L W 0 . 8 4 8 & 1 . 0 0 W L 2 L 1 D 0 . 7 c , m i n c c , m i n Hence correction for pattern of loading in the direction of longer span is not required. 14