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Question 4 Beam 1-A/B in Figure $Q3$ is a rectangular beam, shown a rectangular reinforced beam section. The design moment applied to the beam is $250kNm$. Given: $f_{k}=30N/mm_{2}f_{k}=500N/mm_{2}?$ (i) Calculate the effective depth (d) of the beam (Assume $?$ main bar $=20$ $mm$ ). State your assumption for concrete cover and diamcter of link. (CO2-PO1:C1) (5 marks) (ii) Find whether the beam is singly reinforced or doubly reinforced. (CO2-PO2:C5) (3 marks) (iii) Determine the area of the reinforcement. (CO3-PO2: C5) (7 marks)

(1) To calculate the effective depth (d) of the beam, we must first assume a concrete cover and diameter of link. For this problem, let's assume a con