Design of square footing for a single column - Reinforced Concrete with FRP Bars: Mechanics and Design - page 359

Table 10.3 Conversion table
US customary SI units
Lengths, areas, section properties
1 in. 25.4 mm

0.025 m

1 ft 304.8 mm

0.305 m

1 in. 2 645 mm 2

1 ft 2 0.093 m 2

1 in. 3 16,387 mm 3

1 in. 4 416,231 mm 4

Forces, pressures, strengths
1 lbf 4.448 N

1 kip 4.448 kN

1 lbf-ft 1.356 N.m

1 kip-ft

1.356 kN ⋅ m

1 psi 6.895 kPa

1 psf 47.88 N/m 2

1 ksi 6.895 MPa

1 ksf 47.88 kN/m 2

1 lbf/ft 3 157.1 N/m 3

Compressive modulus of elasticity is

1.5

ρ

0.5 c

E:33 psi = ⋅ f ′

c c

− 3

Ibf.ft

The following is computed as indicated in Section 8.5.1 of ACI 318-11:

E c = 4074·ksi

Concrete tensile strength is

0.5

f: 7.5psi =⋅ ⋅ f

′

ct c

This is computed as indicated in Section 9.5.3.2 of ACI 318-11:

f ct = 530·psi