Norma Aashto

Article A5.4
Page 1 of 18
2/2012
PRESTRESSED GIRDER PROPERTIES
GIRDER W/CAST-IN-PLACE DECK
Section Properties and maximum span length curves for the AASHTO, Bulb Tee, and Wide Flange girders are included in this Article.
The maximum span length curves should only be used as an aid in preliminary design. The curves on based on the following design parameters:
• AASHTO LRFD DesignSpecifications
• Simple Span lengths are centerline-centerline bearing
• 42’-0” out-out bridge width
• Girder spacing is for 4,5,6,& 7 girders (6’-0”; 7’-3”; 9’-3”; 12’-0”)
• Concrete parapet
• Slab f’c = 4.0 ksi
• Future wearing surface = 28 psf
• HL93 live load
• Harp points at 0.4 & 0.6 points
• Deck thickness determined by (S+10)/30 where S is computed in accordance with Article 9.7.2.3
•Minimum 8” nominal deck slab thickness. Structural deck thickness is 0.5” less than the nominal thickness
• The maximum number of straight strand for each girder is:
AASHTO Type 2
16 straight
AASHTO Type 3
34 straight
AASHTO Type 4
48 straight
Bulb Tee Girder
24 straight
WF Girders
44 straight
DECK BULB TEE GIRDER W/ASPHALT OVERLAY
Section Properties and maximum span length curves for theBulb Tee girders with an 8” thick top flange are included in this Article.
The maximum span length curves should only be used as an aid in preliminary design. The curves on based on the following design parameters:
• AASHTO LRFD Design Specifications
• Simple Span lengths are centerline-centerline bearing
• 42’-0” out-out bridge width
• Girder spacing is for 6, 7, & 8 girders (84”, 72” & 63”top flange width)
• Concrete parapet
• Future wearing surface = 28 psf
• HL93 live load
• Harp points at 0.4 & 0.6 points

Article A5.4
Page 2 of 18
2/2012
DECK BULB TEE GIRDER W/5” CAST-IN-PLACE SLAB
Section Properties and maximum span length curves for the Bulb Tee girders with a 3” thick top flange and 5” slab are included in this Article.
The maximum span length curves should onlybe used as an aid in preliminary design. The curves on based on the following design parameters:
• AASHTO LRFD Design Specifications
• Simple Span lengths are centerline-centerline bearing
• 42’-0” out-out bridge width
• Girder spacing is for 6, 7, & 8 girders (84”, 72” & 63” top flange width)
• Concrete parapet
• Slab f’c = 4.0 ksi
• Future wearing surface = 28 psf
• HL93 live load
•Harp points at 0.4 & 0.6 points

Revisions:
July 2009

Feb 2012

Added design parameters on page 1
Added WSDOT WF girder data
Added Deck Bulb Tee Girder maximum span curves
Revised maximum span graphs for refined losses
Changed from 7.5 ksi concrete to 10 ksi concrete

Article A5.4
Page 3 of 18
2/2012

AASHTO GIRDER SECTION PROPERTIES
CENTER OF GRAVITY

SECTION MODULUS

WEIGHTDEPTH

AREA

TOP

BOTTOM

MOMENT OF INERTIA

TOP

BOTTOM

LB/FT

36"

368.44

20.147

15.853

50,842

2524

3207

384

45"

558.94

24.706

20.294

125,165

5066

6168

582

54"

788.44

29.249

24.751

260,403

8903

10,521

821

ALL UNITS IN INCHES EXCEPT WEIGHT

Article A5.4
Page 4 of 18
2/2012

Article A5.4
Page 5 of18
2/2012

Article A5.4
Page 6 of 18
2/2012
37” TOP FLANGE BULB TEE GIRDER SECTION PROPERTIES
CENTER OF GRAVITY

SECTION MODULUS
WEIGHT LB/FT

DEPTH

AREA

TOP

BOTTOM

MOMENT OF INERTIA

TOP

BOTTOM

30"

449.9375

15.644

14.356

51,361

3,283

3,578

469

36"

491.9375

18.857

17.143

82,126

4,355

4,791

512

42"

533.937522.036

19.964

121,708

5,523

6,096

556

48"

575.9375

25.190

22.810

170,872

6,783

7,491

600

54"

617.9375

28.322

25.678

230,379

8,134

8,972

644

60"

659.9375

31.438

28.562

300,990

9,574

10,538

687

66"

701.9375

34.539

31.461

383,465

11,102

12,189

731

72"

743.9375

37.630

34.370...