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The University of the West Indies Organization ofAmerican States
PROFESSIONAL DEVELOPMENT PROGRAMME:
COASTAL INFRASTRUCTURE DESIGN, CONSTRUCTION AND
MAINTENANCE
A COURSE I N
COASTAL DEFENSE SYSTEMS I
CHAPTER11
STRUCTURAL DESIGN
By DAVE BASCO, PhD
Professor, Department of Civil and Environmental Engineering
And Director, the Coastal Engineering Centre,
Old Dominion University
Norfolk, VA
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STRUCTURAL DESIGN OFSTRUCTURAL DESIGN OF
David R. Basco, Ph.D, P.E.
Director, The Coastal Engineering CenterOld Dominion University,Norfolk, Virginia
USA 23529 [email protected]
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COURSE ORGANIZATIONCOURSE ORGANIZATION
Course 2.1: Design of Coastal Structures I- Stability of loose-material structures (breakwaters and
revetments)- Case studies: Introduction, Example Problems VI-7
Course 2.2: Design of Coastal Structures II- Design philosophy; probabilistic design methods- Role of damage in coastal structure design- Cross-sectional design (breakwaters/revetments)- Balanced design prinicples
- Case study Course 4: Design of Marine Structures
- Seawalls and bulkheads- Beaches- Example problems VI-7 Armor Layer Stability
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Coastal Engineering Practice Committee
CEM Preview
Steven A . Hughes. Ph.D., P.E.
Coastal and Hydraulics LaboratoryUS Army Engineer Research and Development Center
David R. Basco . Ph.D., P.E.Coastal Engineering Center
Old Dominion University
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CEM Preview
Overview of Armor Layer Stability
Rubble-Mound Trunk and Head StabilityRiprap and Toe Stability
Cross-Section Design
Example Problems
CEM Chapter VI-5-3 (Author: Hans F. Burcharth)
CEM Chapter VI-7 (Author: David R. Basco)
Based on:
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Movement of armor units
Rocking
Displacement from layer
Sliding of layer
Settlement of layer
Not armor unit breakage
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Parameter Stability Equation
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Sea State Variables Wave height
Wave length Wave steepness Wave angle Wave Asymmetry Spectrum shape Water depth Water density
Structure VariablesArmor layer slope
FreeboardArmor densityArmor gradationArmor weightArmor shape Packing density Layer thickness
Porosity of layers
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Classified by: Type of armor unit
Water depth Superstructure Dynamic Crest elevation
Non-overtopped Low-crested Submerged
Based on small-scale physical models Testing of designs is recommended
Always test unusual designs
Model Testing
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CEM Preview
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Coastal Engineering Practice Committee
CEM Preview
Overview of Armor Layer Stability
Rubble-Mound Trunk and Head StabilityRiprap and Toe Stability
Cross-Section Design
Example Problems
CEM Chapter VI-5-3 (Author: Hans F. Burcharth)
CEM Chapter VI-7 (Author: David R. Basco)
Based on:
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Design Guidance for These Situations
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Hudsons Equation
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where
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CEM Preview
Overview of Armor Layer Stability
Rubble-Mound Trunk and Head StabilityRiprap and Toe Stability
Cross-Section Design
Example Problems
CEM Chapter VI-5-3 (Author: Hans F. Burcharth)
CEM Chapter VI-7 (Author: David R. Basco)
Based on:
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CEM Preview
Gradation Range:
with
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Design guidance for: Sloping trunk and head Vertical trunk and head
Toe berms
Support main armor layer Prevent damage by scour
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Overview of Armor Layer Stability
Rubble-Mound Trunk and Head StabilityRiprap and Toe Stability
Cross-Section Design
Example Problems
CEM Chapter VI-5-3 (Author: Hans F. Burcharth)
CEM Chapter VI-7 (Author: David R. Basco)Based on:
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One Side Exposed to Waves
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Both Sides Exposed to Waves
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Geometric Design Aspects Crest elevation and width Concrete cap
Armor layer thickness Primary layer bottom elevation Toe berm Structure head
Lee-side armor Underlayers Bedding/filter layer Scour protection
Preliminary Design Phases
1. Structure geometry2. Evaluate construction
technique
3. Evaluate design materials
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Crest width:
Armor layer thickness:
Riprap layer thickness:
(whichever is greatest)
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Overview of Armor Layer Stability
Rubble-Mound Trunk and Head StabilityRiprap and Toe Stability
Cross-Section Design
Example Problems
CEM Chapter VI-5-3 (Author: Hans F. Burcharth)
CEM Chapter VI-7 (Author: David R. Basco)Based on:
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l Revetment StructureSame as runup and overtopping exmpl
The CBBT Island Case Study
l Nearshore Breakwater Structure
Chesapeake Bay Bay Ridge,MD
Cape Henry-Fort Story,VA
l Jetty Structure Oregon Inlet,NC
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Impermeable Revetment Non-overtopping Waves
Armor Stone
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CBBT original design
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October 31,1991 Northeaster The Great Halloween Storm of 1991
The Perfect Storm (Junger,1997)
The Storm of the Century (movie)
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The design wave height The evolution of design waves
Impermeable revetments
Non-overtopping waves
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Table VI-6-4 Hudson formula Table VI-6-5 Van der Meer (plunging)
Table VI-6-6 Van der Meer (surging)
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(a)Damage Curve Relations for VI-7-10 (b)Damage Curve Relations for VI-7-11
C t l E i i P ti C itt
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Nearshore breakwaters Permeable
Submerged
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SUMMARY: ARMORSUMMARY: ARMOR--LAYER STABILITYLAYER STABILITY
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SUMMARY: ARMORSUMMARY: ARMOR LAYER STABILITYLAYER STABILITY
1. Hudson (1974) SPM (1984)1. Hudson (1974) SPM (1984)
Limited applicabilityLimited applicability
-- ONLY permeable structuresONLY permeable structures
-- ONLY nonONLY non--overtopping wave conditionsovertopping wave conditions
Factors not consideredFactors not considered
-- Wave period,Wave period, TTpp-- Variable structure permeability, PVariable structure permeability, P
-- Damage level, SDamage level, S
-- Storm duration (number of waves), tStorm duration (number of waves), tdd
SUMMARY: ARMORSUMMARY: ARMOR--LAYER STABILITYLAYER STABILITY
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SUMMARY: ARMORSUMMARY: ARMOR LAYER STABILITYLAYER STABILITY
2. CEM (2000)2. CEM (2000)
No limitationsNo limitations
-- Includes wave overtopping andIncludes wave overtopping andsubmergedsubmerged condtionscondtions
-- IncludesIncludes TTpp, P, S and t, P, S and tdd factorsfactors
Methods easy for EXCELMethods easy for EXCEL
Includes partial safety factors for designIncludes partial safety factors for design
Use CEM (2000) methods to estimate armorUse CEM (2000) methods to estimate armor--
layer stability.layer stability.
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