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20 R E L A S T ® D E S I G N M A N U A L Base Material Material Concrete Concrete class C20 25 f ck 20 Nmm 2 γ c 1 5 a ct 0 85 f cd 11 33 Nmm 2 Geometry - Beam h 600 mm b w 400 mm c top 25 mm *Top cover c bot 25 mm *Bottom cover Existing reinforcement ρ 0 37% ∅ x 20 mm *Diameter in x direction d x 565 mm *Effective depth in x γ s 1 15 f yk 500 Nmm 2 f yd 434 78 Nmm 2 Side view Top view 4 DESIGN EXAMPLES SHEAR REINFORCEMENT