2A Short Span Steel Brs H Seradj

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Dodge Creek Bridge

Mill Creek Bridge


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Linear regression equations for thickness loss in

5% NaCl Cyclic Corrosion tests.

Publication : FHWA-HRT-11-061, July 2011

SteelCoefficient

Mill per Cycle

Predicted Life VS

ASTM A 588

ASTM A 1010 0.050 10.40

11Cr 0.056 9.30

9Cr 0.147 3.50

9Cr2Si 0.197 2.60

7Cr2Si 0.304 1.70

7Cr2Al 0.152 3.40

7Cr2Si2Al 0.275 1.90

ASTM A 588 0.519 1.00


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SteelBridgeDesignHandbook

http://www.fhwa.dot.gov/bridge

/steel/pubs/if12052/


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20. DesignExample:Threespan Continuous Straight

IGirder Bridge

21. Design

Example:

Twospan Continuous

Straight I Girder Bridge

22. DesignExample:Twospan Continuous Straight Wide

Flange Beam Bridge

23. DesignExample:Threespan Continuous Curved I

Girder Beam Bridge

24. DesignExample:Threespan Continuous Straight Tub

Girder Bridge

25. DesignExample:Threespan Continuous Curved Tub

Girder Bridge


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KHF


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Shaped Charge to

Cut Flange

System Behavior

Deck Must Transfer Load From

Fractured Girder

Deck and Shear Stud DetailsControl Behavior

Girder Must Hang From Shear

Studs- Stud Depth in Deck

Important ParameterCast in Place Bridge Rail

Greatly Increases Strength and

Stiffness of Girders


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Final deflection afterlive load placed on

bridge was 4.7 for

inside and 5.3 forexterior girder

Final stress in bottom

flanges20 ksi

KHF


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Decreases

superstructures

depthErectionofSteelSuperstructures

NofalseworkLifting

and

placing

steel

girder

as

a

unit


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18Atorod Azizinamini, Ph.D., P.E. Florida International University


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Cross section of Mass DOT bridgeCross section of Mass DOT bridge


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Bridge Technology

Center (BTC): Modules with steel

press-brake tub

girders Galvanized or

weathering


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Technical working group:

State DOTs

Mills/plate producers

Universities

Bridge design engineers

Fabricators


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Bridge crosssection:


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I-5 Marquam

Portland


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Advantages of Steel Bridges:

Decreases superstructures depthAASHTO LRFD Table 2.5.2.6.3-1

Superstructure Simple Cont.Precast I-Beams 0.045L 0.04L

Steel Beams 0.033L 0.027L

For L=100:

100(0.045-0.033)=1.2 depth reduction


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Earth work at roadway per foot

Volume = [2(X+Y+4)+Z]*(change is superstructure depth)

1.2[2(4+12+0)=38.4 ft3 /ft


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Concrete bridges value engineered to steel bridges.

Applegate River Bridge

Upper Perry Bridges


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Longer spanSuperstructures erection

Shorter construction time Lighter superstructure

Innovative design and ideas


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Thanks


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Fairview Road Bridge

Waterville Bridge

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2A Short Span Steel Brs H Seradj