For central columns up to plinth, ground floor and first floor: M30 grade Ec = 5 000 fck N/mm 2 = 5 000 fck MN/m 2 = 27 386 N/mm2 = 27 386 MN/m2. Steel HYSD reinforcement of grade Fe 415 confirming to IS: 1786 is used throughout. 1.2. Geometry of the