General Reco's of the code  m for concrete 1.5, for steel 1.05 Concrete strength – CUBE STRENGTH Grades of steel Fe250 & Fe460 Primary Load combination 1.4DL+1.6LL E of concrete E c = 5.5√f cu /  m 10% less than IS Ultimate stress in concrete 0.67f cu /  m Steel Stress-strain curve – Bilinear E of steel 200 kN/mm 2
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