Norma Aashto
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...
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