Limit State Method Of Design | Reinforced Cement Concrete | CE

Deflection limits: Final deflection . Final deflections due to partitions and finishes or 20 mm whichever is less For calculating deflections, take E = Ec = 5000 and I = I eff = but I r £ I eff < Igr . where Mr = fcr . Igr = M.I. of gross section I r = M.I. of cracked section. For singly reinforced sections, I r = + m Ast (d – x) 2 where x = distance of NA from compression flange For doubly reinforced sections I r = + (m – 1) Ast (d – d) 2 + m Ast (d – x) 2 * Crack width: Acceptance limits are: 1. 0.3 mm in members if cracking is not harmful to the durability of structure. 2. 0.2 mm in members continuously exposed to moisture or in contact with soil. 3. 0.1 mm in aggressive environment. * Cracks due to bending in a compression member subjected to axial load of 0.2 fck Ac need not be checked, if 1. Spacing between adjacent bars > dia. of larger bar and 5 mm more than size of coarse aggregate 2. If there are two or more number of rows of bars the spacing between the rows should be ...