A square footing is to support a 400mm x 400mm tied column that carries a service dead load of 880 kN and a service live load of 710kN. The column is reinforced with 8-25 mm diameter bars. The base of the footing is 1.5 meter below the natural grade line where the soil bearing capacity is 235 kPa. The soil above has a unit weight of 15.6 kN/m³. Using fy=275 MPa, f’c=27.5 MPa, and unit weight of concrete of 23.5 kN/m³. Assume footing depth of 600 mm for soil bearing pressure. Use U = 1.2D + 1.6L 1. Determine the number of 25 mm diameter bars in one direction.
A square footing is to support a 400mm x 400mm tied column that carries a service dead load of 880 kN and a service live load of 710kN. The column is reinforced with 8-25 mm diameter bars. The base of the footing is 1.5 meter below the natural grade line where the soil bearing capacity is 235 kPa. The soil above has a unit weight of 15.6 kN/m³. Using fy=275 MPa, f’c=27.5 MPa, and unit weight of concrete of 23.5 kN/m³. Assume footing depth of 600 mm for soil bearing pressure. Use U = 1.2D + 1.6L 1. Determine the number of 25 mm diameter bars in one direction.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A square footing is to support a 400mm x 400mm tied column that carries a service dead load of 880 kN and a service live load of 710kN. The column is reinforced with 8-25 mm diameter bars. The base of the footing is 1.5 meter below the natural grade line where the soil bearing capacity is 235 kPa. The soil above has a unit weight of 15.6 kN/m³. Using fy=275 MPa, f’c=27.5 MPa, and unit weight of concrete of 23.5 kN/m³. Assume footing depth of 600 mm for soil bearing pressure. Use U = 1.2D + 1.6L
1. Determine the number of 25 mm diameter bars in one direction.
a. 10
b. 13
c. 8
d. 11
2. Determine the dowel requirement.
a. 180 mm
b. 220 mm
c. 200 mm
d. 190 mm
3. Determine the development length requirements.
a. 500 mm
b. 485 mm
c. 515 mm
d. 450 mm
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