1 Modification factor for tension reinforcement Ref IS 456:2000 Fig 4 % % IS 456 Fig 4 415 229.24 0.2 0.21 1.85 2 Modification factor for compression reinforcement Ref IS 456:2000 Fig 5 % IS 456 Fig 5 0.2 1.06 3 Ref IS 456:2000 Table 19 % 30 0.5 0.50 4 Ref IS 456:2000 Table 23 % 35 0.5 0.31 5 Ref IS 456:2000 Cl 40.2.1.1, Table 19 D k % of slab 30 0.5 150 1.30 0.65 6 Ref IS 456:2000 Cl B-5.2.1.1, Table 23 D k % of slab 30 0.5 150 1.30 0.403 7 Permissible compressive & tensile stress in concrete for working stress design met Ref IS 456:2000 Table 21, Cl B-2.1.1 30 10 8 3.6 8 Area of steel calculation by limit state design method Ref IS 456-2000 Cl G-1.1b For sections without compression reinforcement b D cc cg d Ast req mm mm mm of bar mm mm kNm 415 30 1000 150 30 8 112 10 255.48 9 Area of steel calculation by working stress method For sections without compression reinforcement b D cc cg d Ast req mm mm mm of bar mm mm kNm fy fs pt req. pt prov. MFt N/mm 2 N/mm 2 pc MFc Permissible shear stress in concrete (tc) for beams in limit state design method fck pt tc N/mm 2 N/mm 2 Permissible shear stress in concrete (tc) for beams in working stress design metho fck pt tc N/mm 2 N/mm 2 Permissible shear stress in concrete (ktc) for solid slabs in limit state design m fck pt k tc N/mm 2 N/mm 2 Permissible shear stress in concrete (ktc) for solid slabs in working stress desig fck pt k tc N/mm 2 N/mm 2 fck scbc scc sct N/mm 2 N/mm 2 N/mm 2 N/mm 2 fy fck Mu N/mm 2 N/mm 2 mm 2 fck sst Mu N/mm 2 N/mm 2 mm 2