250mm by 400mm rectangular beam is reinforced with 3-20 mm diameter bars, f’c=35 MPa, fy=345 MPa, diameter of stirrups=10mm, and concrete cover=40mm. Calculate the effective depth of the beam. i. 340 mm j. 320 mm k. 300 mm l. 330 mm
15. A 250mm by 400mm rectangular beam is reinforced with 3-20 mm diameter bars,
f’c=35 MPa, fy=345 MPa, diameter of stirrups=10mm, and concrete cover=40mm.
Calculate the effective depth of the beam.
i. 340 mm
j. 320 mm
k. 300 mm
l. 330 mm
16. A 250mm by 400mm rectangular beam is reinforced with 3-20 mm diameter bars,
f’c=35 MPa, fy=345 MPa, diameter of stirrups=10mm, and concrete cover=40mm.
Calculate the depth of compression block in the beam.
m. 54.648 mm
n. 45.446 mm
o. 43.718 mm
p. 50.025 mm
17. A 250mm by 400mm rectangular beam is reinforced with 3-20 mm diameter bars,
f’c=35 MPa, fy=345 MPa, diameter of stirrups=10mm, and concrete cover=40mm.
Calculate the depth of neutral axis in the beam.
m. 43.718 mm
n. 45.446 mm
o. 54.648 mm
p. 50.025 mm
18. A 250mm by 400mm rectangular beam is reinforced with 3-20 mm diameter bars,
f’c=35 MPa, fy=345 MPa, diameter of stirrups=10mm, and concrete cover=40mm.
Calculate the strain at the extreme layer of steel.
i. 0.01134
j. 0.01235
k. 0.01565
l. 0.01889
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