ANALYSIS AND DESIGN OF DOUBLY REINFORCED CONCRETE BEAMS 1. A rectangular beam with a width of 350mm and a total depth equal to 500 is reinforced with a tensile area equal to 4000mm² at the bottom and have an effective depth equal to 450mm and a compression steel area equal to 890mm² at the top with an effective depth equal to 50mm. Solve for its design moment. F'c = 21 MPa, Fy= 345 MPa

A concrete floor slab 100 mm thick is cast monolithic with concrete beams 2.0 m on centers. The beams have a span of 4.0 m, web width of 250 mm and overall depth of 500 mm. The tensile reinforcement consists of 6 - ø20 mm bars in two rows with 25 mm vertical clear spacing. Use material strength f'c = 21 MPa and fy = 415 MPa. Calculate the following considering a T-geometry: Effective flange width of an interior beam in mm = _______ Depth of uniform stress block at ultimate stage in mm to the neares whole number = _______ Tensile steel strain compatible with concrete strain of 0.003 in 3 decimal places = __________

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A rectangular reinforced concrete beam has a length of 14 m is simply supported atboth ends. The width of beam is 350mm and the overall depth is 550  mm. Determine the area of the steel reinforcements if the beam is to carry a DL = 15kN/m and LL =18kN/m. The concrete strength fc = 25  and steel yield fy = 400 ������. Use 60 mm concretecover.