A square spread footing supports an interior 500mm-square column supporting a service dead load of 1800...

 

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A square spread footing supports an interior 500mm-square column supporting a service dead load of 1800 kN and a service live load of 1250 kN. The allowable bearing pressure is 290 kN/m² at the base of the footing 2m. below the grade. The top of the footing is covered by soil 1.1 m soil with unit weight of 18.8 kN/m³ and a 150mm thick basement floor (basement floor loading of 4.8 kPa). Assume concrete weighs 23.54 kN/m3; fc = 24.1 MPa, fy = 415 MPa. Use 20mmØ RSB. Thickness of footing = 750mm and cc=75mm. a. Determine the dimension of the square footing. b. Determine the bending moment at critical section. C. Determine the no. of 20mmØ RSB required bothways. A square spread footing supports an interior 500mm-square column supporting a service dead load of 1800 kN and a service live load of 1250 kN. The allowable bearing pressure is 290 kN/m² at the base of the footing 2m. below the grade. The top of the footing is covered by soil 1.1 m soil with unit weight of 18.8 kN/m³ and a 150mm thick basement floor (basement floor loading of 4.8 kPa). Assume concrete weighs 23.54 kN/m3; fc = 24.1 MPa, fy = 415 MPa. Use 20mmØ RSB. Thickness of footing = 750mm and cc=75mm. a. Determine the dimension of the square footing. b. Determine the bending moment at critical section. C. Determine the no. of 20mmØ RSB required bothways.