A footing needs to support a 450mm square column. The column carries a service dead load of 450kN and a service live load of 280 kN. Use the following date; f'c = 28MPA, fy = 414 MPa; unit weight of soil = 17.5 kN/m^3, unit weight of concrete = 23.5 kN/m^3, allowable soil pressure = 250 kPa, depth of footing = 2.0 m and main bar diameter is 20 mm. Assume 800 mm thickness of footing and concrete cover of 75 mm. 1. Design a square footing. Use proper rounding off based on the discussion. a) length of the side of square footing in meters. Blank 1 b) computed effective depth in mm. Blank 2 c) height of concrete in mm. Blank 3 d) number of reinforcement. Blank 4 2. Compute the final effective depth if the width is limited to 1.50m. Use proper rounding off based on the discussion. a) d short in mm Blank 5 b) d long in mm Blank 6 Blank 1 Add your answer Blank 2 Add your answer Blank 3 Add your answer Blank 4 Add your answer Blank 5 Add your answer Blank 6 Add your answer

A structural engineer finished a design of a library. They determine that each column will carry 1000 lbs. the soil beneath the footing has the properties: gamma= 130 pcf, c= 75psf, phi= 40 degrees. The groundwater table is of great depth so it’s no concern. Sketch figures. What is the minimum size of the footing for a factor of safety of 3? Case 1: assume square footing Case 2: assume round footing

Subject: Principles of Foundation Design (Use NCSP) A rectangular footing is to be used to support a 300x400 (*400mm side is parallel to the long dimension of the footing) column loaded with 420 kN dead load and 540 kN live load. One side of the footing is 4.0m. Use effective soil pressure of 70 kPa. f'c=35 MPa and fy=420 MPa. Use minimum steel ratio for longitudinal bars as 0.0018. •Calculate the required thickness of the footing (mm) based on wide beam shear. db=16mm. Size of footing should be multiples of 10mm (Answer: 300) •Calculate the required thickness of the footing based on two-way shear. db=16mm (Answer: 430) • Calculate the required number of 16mm bars along long direction. . Use the governing thickness based on shear requirements. (Answer: 22)