Grade-1 Registered Structural Engineer (China)

Practice session

A simply reinforced concrete rectangular beam has a cross section of b × h = 250 mm × 500 mm with an effective depth h₀ = 460 mm. The concrete grade is C30 (design axial compressive strength f_c = 14.3 N/mm², α₁ = 1.0, β₁ = 0.80) and the longitudinal reinforcement consists of 3Φ20 HRB400 bars (f_y = 360 N/mm², total area A_s = 942 mm²). According to GB 50010-2010 (2015 Edition), what is the design flexural moment capacity M_u of the beam section?

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