Question

A simply supported beam 10-m long is acted upon by a uniformly distributed dead load of 20 kN/m and a uniformly distributed live load of 48 kN/m throughout its span.

Design the footings of each columns located at the supports using the following data

• Depth of Footing (D_f)                                                   =             1.20 meters
• Allowable Soil Pressure (q_all)                                      =             210 kPa
• Unit Weight of Soil (γ_s)                                                =             17 kN/m³
• Unit Weight of Concrete (γ_c)                                      =             24 kN/m³
• Design Compressive Strength of Concrete (f’_c)     =             27.6 MPa
• Yield Strength of Reinforcing Steel (f_y)                    =             276 MPa
• Use 16 mm diameter reinforcing bars for both footing and column.

Assume that:

• A square column with a dimension of 450 mm is located on the left support.
• A circular concrete column of 500 mm in diameter is located on the right support.
• Property line is located 0.50 meters from the left support and 2.0 meters from the right support.

Determine the following for the designed footings on the left and the right side of the beam:

1. Approximate thickness
2. Effective allowable bearing capacity
3. Dimension of the footing
4. Ultimate soil bearing capacity.
5. Minimum depth against One – Way Shear
6. Minimum depth against Two – Way Shear
7. Design and detail of reinforcement
8. Development length adequacy
9. Concrete bearing stress adequacy
10. Draw the footing in detail.

BONUS:

1. Minimum depth against Moment
2. Steel Ratio
3. Coefficient of Resistance

Answer 1