Cast in place slab

Thickness actual = 200 mm

t_s structural = 190 mm

Concrete strength at 28 days f`_c = 28.0 MPa

Concrete unit weight w_c = 23.56 kN/m3

Concrete density y_c = 2403 kg/m3

Precast beams:

NU-1600 Precast prestressed girder, as shown in Figure 15, “NU-1600 Girder,” on page 18.

Concrete strength at release f`^c = 35.0 MPa

Concrete strength at 28 days f_c = 45.0 MPa

Concrete unit weight w_c = 23.56 kN/m3

Concrete density y_c = 2403 kg/m3

Precast beam length = 30000 mm (End Span)

= 32700 mm (Center Span)

Design Span (Figure 9, “Component Forces of Total Prestress Force,” on page 8)

For non-composite beam = 29700 mm (End Span)

= 32400 mm (Center Span)

For composite beam = 30000 mm (End Span)

= 33000 mm (Center Span)

Prestressing strands:

12.7 mm diameter, low relaxation.

Area of one strand = 98.7 mm²

Ultimate strength f_pu = 1861.580 MPa

Yield strengthfpy = 0.9 f_pu[LRFD Table 5.4.4.1-1]

= 1675.422 MPa.

Stress limits for prestressing strands [LRFD Table 5.9.3-1]

Before transfer $f_{pu}\le 0.75f_{pu}$

$\le 1396.328MPa$

At service limit state (after all losses)

$f_{pe}\le 0.80f_{py}$

$\le 1340.338MPa$

Modulus of elasticity E_p = 197000 MPa [LRFD Art. 5.4.4.2]

Reinforcing bars:

Yield strengthfy = 413.7 MPa

Modulus of elasticity E_s = 207000 MPa [LRFD Art. 5.4.3.2]

Future wearing surface:

50 mm of concrete of unit weight of 23.56 kN/m³

New Jersey type barrier:

Weight = 4.378 kN/m/side