A rectangular beam 250 mm wide, 500 mm deep is reinforced at the bottom with 4-20-mm-diameter bars and at the top with 2-16-mm bars. Concrete cover to bar centroid at the top is 80 mm and at the bottom is 70 mm. Use concrete strength fc = 21 MPa and steel yield strength fy = 415 MPa for 20-mm bars and fy = 275 MPa for 16-mm bars.
A rectangular beam 250 mm wide, 500 mm deep is reinforced at the bottom with 4-20-mm-diameter bars and at the top with 2-16-mm bars. Concrete cover to bar centroid at the top is 80 mm and at the bottom is 70 mm. Use concrete strength fc = 21 MPa and steel yield strength fy = 415 MPa for 20-mm bars and fy = 275 MPa for 16-mm bars.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Determine the following:
a.) the tensile steel ration for positive bending.
b.) the depth of the uniform rectangular stress block on the beam section at the ultimate stage when subject to positive bending.
c.) the design moment capacity in kN-m of the beam in positive bending.
Transcribed Image Text:A rectangular beam 250 mm wide, 500 mm deep is reinforced at the bottom with 4-20-mm-diameter bars and at the top with 2-16-mm bars. Concrete cover to bar
centroid at the top is 80 mm and at the bottom is 70 mm. Use concrete strength f'c = 21 MPa and steel yield strength fy = 415 MPa for 20-mm bars and fy = 275
MPa for 16-mm bars.
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