Evaluation of Existing Dock Facilities for Allowable Loading
Transcript of Evaluation of Existing Dock Facilities for Allowable Loading
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Evaluation of Existing Dock Facilities for Allowable Loading
Facilities Engineering Seminar, April 24, 2019
Gary Ledford, P.E.
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Loadings on Marine Structures
UFC 4-152-01 Design: Piers and Wharves
UFC 4-159-03 Design: Moorings
ASCE 7 Minimum Design Loads for Buildings and Other Structures
ASCE 61-14 Seismic Design of Piers and Wharves
OCIMF
MOTEMS
Others
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In Service Loadings
How well the load is defined
Do we know the structural details of the dock
Condition of the dock structure
Deciding when too much is too much
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Crane Request Program
Not Daily Operation
Truck Mounted Cranes
Small Independent Operators
Propping Load Calculations (?)
Minimum Size Outrigger Pad
Evaluation needed ASAP
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Damage to Open Pile Wharf Deck
Underside of prestressed concrete deck units
No topside damage
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CFRP Strips in service since 1998
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Crane Request Form
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Crane Request Form
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Muti-Beam DeckOpen pile wharfs – 1970’s thru 1990’s
15 or 18 inch thick by 4 foot wide prestressed concrete deck units
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Muti-Beam Deck
CIP concrete topping: 3 to 9 inches thickPile cap spacing ranged from 20 to 30 feet on centerPost tensioned together at mid-span or third pointsLoad sharing among deck units?
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AASHTO
Load Distribution Factor
Simple equation based on number of lanes of traffic.
Apply to multi-axle cranes and outrigger pad loads?
What was the basis for the equation?
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H. M. Westergaard
Computation of Stresses in Bridge Slabs Due to Wheel LoadsPublic Roads, March 1930
University of Illinois
The United States Bureau of Public Roads
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Load Distribution in Multi-Beam Deck
Finite Element Model
Good Agreement with the AASHTO Distribution Factor
No evidence of longitudinal cracking in the topping
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Truck Crane Loads
Continue to use the DF
Require maximum loaded outrigger pad be located over a pile cap
Avoid trench drains, etc.
No further damage since 2001
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Bulkhead Walls
Without Relieving Platforms
Truck Mounted Crane Position
Failure Wedge
Classical Analysis Methods
No Go
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Bulkhead Walls with Relieving Platforms
Mobile Harbor Cranes
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AASHTO Guidance
Add to width and length of pad dimensions 15% times the depth to the top of the relieving platform
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Maximum Propping Load
Safety factor on tipping load?
Not if it includes dynamic and wind effects
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Heavy Cargo Loads
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Unusual Loads
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Unusual Loads
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Redistribution of Dead Load
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Evaluation of Allowable Loads
How well the load is defined
Do we know the structural details of the dock
Condition of the dock structure
Deciding when too much is too much
Reoccurring events – formal evaluation procedure
Authority to enforce the results of the evaluation
Mitigate Risk
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Thank You