0.084 IS 456-2000 Clause 26.5 Requirements of Reinforcement for Table 6-4 Limiting Percentage of Reinforcement Pt,limįor singly reinforced rectangular sections fck N 2 / mm Table 6-3 Limiting Moment of resistance factor Q lim, N / mm2 For singly reinforced rectangular sections Index for Singly Reinforced Rectangular Sections If Xu Xu,max the section is over-reinforced ( doubly reinforced ) where, Xu,max = 0.53 x d ( for Fe250 mild steel ) Xu,max = 0.48 x d ( for Fe415 HYSD steel ) Xu,max = 0.46 x d ( for Fe500 HYSD steel ) Xu,max = 0.44 x d ( for Fe550 HYSD steel ) Xu =( 0.87 fy Ast ) / ( 0.36 fck b ) Table 6-2 Limiting Moment of Resistance and Reinforcement Ast,lim = Mu,lim / ( 0.87 fy ( d - 0.42 Xu,max ) ) Asc = Mu2 / ( fsc x ( d - d' ) ) Ast2 = Asc fsc / 0.87 fy Ast = Ast,lim + Ast2. Design of Rectangular water tank CASE-1 ( L / B Mu,lim : design the section either increasing the dimensions of section or d Over reinforced section ( doubly-reinforced beam ).The additional moment of resist needed is obtained by providing compression( top ) reinforcement and additional te reinforcement.
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