comparative study of codes for the design of composite decks and plate girders for bridges and...
TRANSCRIPT
Comparative Study of Codes for the Design of Composite Decks and Plate Girders for Bridges and Buildings
By Venkata S. Vemana
For CIVL 511 – April 9 2009
Outline
Introduction
General Comparison
Comparison for Composite Decks
Comparison for Plate Girders
Design Examples
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Composite Decks
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Plate Girders
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General Comparison
Building Code
CAN/CSA S16.01
Bridge Code
CHBDC S6.06
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CHBDC S6.06
Larger resistance factors
r
Specific to bridges: fatigue, longer
spans
General Comparison
Building Code
CAN/CSA S16.01
Lower resistance factors
r
More general application
Bridge Code
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Composite Decks
Building CodeRibbed and solid slabs
Bridge CodeSolid slabs only
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Solid slabs only
Composite action for negative moment under certain conditions
Considers rebar in deck
Composite Decks
Building CodeRibbed and solid slabs
Composite action only in positive moment (top compression)
Ignores rebar in concrete
Bridge Code
C
T
C
T
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Solid slabs only
Composite action for negative moment under certain conditions
Considers rebar in deck
Separate capacity for Class 3/plate girders
Composite Decks
Building CodeRibbed and solid slabs
Composite action only in positive moment (top compression)
Ignores rebar in concrete
No distinction between steel section class
Bridge Code
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Composite Decks
Building CodeAllows partial shear connection
Bridge CodePartial shear connection not allowed
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Composite Decks
Building CodeAllows partial shear connection
No special fatigue consideration
Channel connectors: lower resistance
Bridge CodePartial shear connection not allowed
Fatigue considerations for shear stud connectors
Channel connectors: higher resistance
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Plate Girders
Building CodeLongitudinal stiffeners not addressed
Detailed consideration of openings
More lenient proportioning
Bridge CodeBoth types of stiffeners are common
Openings not considered
Conservative width-to-thickness ratios
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Design Example
Composite Deck
Courtesy of Dr. Stiemer
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Design Example
Plate Girder
Courtesy of Dr. Stiemer
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Thank You
Questions?