100 300 H 4.8 kPa surcharge floor load Pp = 600 kN PL = 800 kN C L MD = 20 kN-m M₁ = 30 kN-m 16-mm-diameter longitudinal bars and dowels 16-mm-dia. bars 75 clear cover An architectural requirement of 375 mm by 375 mm column is provided. The design loads supported by the column from structural analysis are as follows: Dead Loads: Axial Load Reaction P 600 kN Internal Moment Reaction M 20 kN-m Live Loads: Axial Load Reaction P Internal Moment Reaction M 800 kN 30 kN-m The NSCP C101-15 Table 405.3.1 applicable load combinations are: U U 1.4D 1.2D + 1.6L The reinforced concrete material strengths are as follows [NSCP C101-15 Sec. 419.2.1.1 and Table 420.2.2.4(a)]: Se Sy 28 MPa at 28 days 420 MPa and uncoated steel It is required to design the square tied column and the supporting square spread footing. Use 16-mm-diameter steel reinforcement following ASTM A615. The dowels may be required to carry some of the column load across the column-footing interface. The top of the footing will be covered with 300 mm backfill soil with a density of 16 kN/m³, and a 100-mm-thick basement floor. The basement floor load is 4.8 kPa and serves as a surcharge. For shallow foundations, the allowable bearing pressure is 290 kPa for medium stiff clay soil.

A square spread footing supports a square tied column as shown. Assume that the reinforced concrete is normal weight (24 kN/m3) and = 1.00 (NSCP C101-15 Table 419.2.4.2). The column has a height of 3.5 meters. 1. Check NSCP code requirements for the reinforcement: (a) longitudinal bar clear spacing, (b) steel ratio, (c) minimum number of bars, (d) minimum lateral tie size, (e) spacing of ties, and (f) arrangement of ties. 2. Calculate the plan dimensions (L m x L m)of the spread footing. Assume a trial thickness of the footing H = 750 mm. 3. Calculate the effective depth d (mm) considering punching shear (two-way shear).