introducing federal aviation faarfield 1 1_4 examples...pavement design procedures flexible pavement...
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Presented to:
By:
Date:
Federal AviationAdministration
Introducing
FAARFIELD 1.42: Latest Updates to FAA Airport
Pavement Design Procedures
Flexible Pavement Examples
IX ALACPA Seminar on Airport Pavements
Quito, Ecuador
David R. Brill, P.E., Ph.D.
30 May 2018
Federal AviationAdministration
Starting Screen – No Job Files Created
May 30, 2018 FAARFIELD Design Examples 2
Click on “New Job”
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Creating/Naming a Job File
May 30, 2018 FAARFIELD Design Examples 3
Enter Job Title
Click OK
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Copy Basic Section/Pavement
Type from Samples
May 30, 2018 FAARFIELD Design Examples 4
Click on “Samples”
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7 Basic Starting Structures in FAARFIELD
Section Name Pavement Type
ACAggregate New flexible on aggregate base
AConFlex HMA overlay on flexible pavement
AConRigid HMA overlay on rigid pavement
NewFlexible New flexible on stabilized base
New Rigid New rigid on stabilized base
PCConFlex PCC Overlay on flexible
PCConRigid Unbonded PCC on rigid
May 30, 2018 FAARFIELD Design Examples 5
Select the pavement type that most correctly represents your design
requirements.
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New Flexible Example Set-Up
May 30, 2018 FAARFIELD Design Examples 6
Create a new section
in job PROJECT by
dragging section
NewFlexible in
Samples to PROJECT.
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Select Metric Option
May 30, 2018 FAARFIELD Design Examples 7
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New Flexible Pavement Design Example
• Initial Pavement Structure:
– HMA Surface, P-401, 100 mm thick
– HMA Stabilized Base, P-403, 150 mmthick
– Crushed Aggregate Base, P-209 (design layer)
– Subgrade CBR = 5
• Traffic Mix:
– 5-Aircraft Mix includes B777, A340, A380
– Use the traffic mix on the next slide.
May 30, 2018 FAARFIELD Design Examples 8
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Traffic Mix for This Example
No. Name
Gross Wt.,
tonnes.
Annual
Departures
Annual
Growth, %
1 A320-100 68.400 600 0.00
2 A340-600 std 366.200 1,000 0.00
3 A380 562.000 300 0.00
4 B737-800 79.243 2,000 0.00
5 B777-300 ER 352.441 1,000 0.00
May 30, 2018 FAARFIELD Design Examples 9
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Changing the Pavement Structure
May 30, 2018 FAARFIELD Design Examples 10
Click on Structure
button to bring up
the Structure screen.
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Change Pavement Structure
May 30, 2018 FAARFIELD Design Examples 11
In Structure window,
click on Modify
Structure
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Change Pavement Structure
May 30, 2018 FAARFIELD Design Examples 12
Change HMA Surface
thickness to 100 mm.
Change base layer
thickness to 150 mm.
Change subgrade
CBR to 5
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Layer Type Selection Box
May 30, 2018 FAARFIELD Design Examples 13
Aggregate
Materials
HMA
Materials
PCC
Materials
Rigid Base
Materials
Flexible Base
Materials
Materials Identified by FAA Specification Item No.
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Change Pavement Structure
May 30, 2018 FAARFIELD Design Examples 14
Click “End Modify”
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Change Pavement Structure
May 30, 2018 FAARFIELD Design Examples 15
Click “Save Structure”
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Enter Traffic Mixture
May 30, 2018 FAARFIELD Design Examples 16
Click on “Airplane”
in section
NewFlexible.
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Enter Traffic Mixture
May 30, 2018 FAARFIELD Design Examples 17
FAARFIELD
displays the default
aircraft list.
Clear the list by
clicking “Clear
List” then “Yes”
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Enter Traffic Mixture
May 30, 2018 FAARFIELD Design Examples 18
Add airplanes to
this list one by one
by selecting from
the library at left.
Click “Add” to add
the selected
airplane.
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Enter Traffic Mixture
May 30, 2018 FAARFIELD Design Examples 19
Certain airplanes
appear in the list
twice. This is to
address the
presence of wing
gears and belly
gears.
FAARFIELD treats
these as two
airplanes.
However, the weight
and departures are
interlocked.
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Adjusting Airplane Information
May 30, 2018 FAARFIELD Design Examples 20
Gross Taxi Weight, Annual Departures and % Annual Growth
may be modified.
Allowable Ranges:
• Gross Taxi Weight: Default Weight -40% to +25%
• Annual Departures: 0 to 100,000
• % Annual Growth: +/- 10% (default is zero)
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Annual Departures in FAARFIELD
• In general, annual departures means
takeoffs.
• Arrivals are ignored.
• For design purposes, FAARFIELD uses the
total annual departures, multiplied by the
design period in years:
– e.g., 1200 annual departures 20 years = 24,000
departures.
May 30, 2018 FAARFIELD Design Examples 21
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Viewing Airplane Information
May 30, 2018 FAARFIELD Design Examples 22
Values in CDF and
P/C ratio columns
will be zero when
airplanes are first
entered.
Save the list when
finished, then click
the Back button.
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Run the Design
May 30, 2018 FAARFIELD Design Examples 23
Click “Design
Structure”
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Running the Design
May 30, 2018 FAARFIELD Design Examples 24
During the design
process, the
“Design Running”
clock will appear.
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Automatic Base Thickness Design
May 30, 2018 FAARFIELD Design Examples 25
FAARFIELD
automatically
designed the HMA
base layer.
Minimum thickness
is 5 in. (127 mm) for
stabilized base on
P-209 subbase.
No additional base
thickness required
provided high-
quality P-209
subbase is used.
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Asphalt CDF Check
May 30, 2018 FAARFIELD Design Examples 26
In the Options
screen, check the
box for “HMA CDF”
Uncheck the box
“Enable Automatic
Base Design”
Check the box
“Compute
Compaction
Requirements”
Click “OK”
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Asphalt CDF Check
May 30, 2018 FAARFIELD Design Examples 27
Re-run the design.
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Final Design
May 30, 2018 FAARFIELD Design Examples 28
HMA CDF is < 1.0.
Therefore,
subgrade strain
controls the design
thickness.
Computed subbase
thickness is 843.6
mm.
(Round to 85 cm.)
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Compaction Calculation
May 30, 2018 FAARFIELD Design Examples 29
Click the
“Life/Compaction”
button to compute
subgrade
compaction
requirements for
the completed
design.
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Compute Compaction - Notes
May 30, 2018 FAARFIELD Design Examples 30
Scroll down until the
heading “Subgrade
Compaction
Requirements”
is displayed.
Two tables display
the compaction
requirements for
non-cohesive and
cohesive soils,
respectively.
Compaction depths
here given in inches.
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Compaction Tables
May 30, 2018 FAARFIELD Design Examples 31
Percent of Max.
Dry Density
Depth from
SurfaceDepth from Top
of Subgrade
Critical Airplane
for Compaction
Modified Proctor (Heavy Load)
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Design Output
May 30, 2018 FAARFIELD Design Examples 32
Open file PROJECT_NewFlexible.pdf in the working directory.
FAARFIELD automatically creates a PDF design report.
Presented to:
By:
Date:
Federal AviationAdministration
Introducing
FAARFIELD 1.42: Latest Updates to FAA Airport
Pavement Design Procedures
Rigid Pavement Design
IX ALACPA Seminar on Airport Pavements
Quito, Ecuador
David R. Brill, P.E., Ph.D.
30 May 2018
Federal AviationAdministration
New Rigid Example Set-Up
May 30, 2018 FAARFIELD Design Examples 34
Create a new section
in job PROJECT by
dragging section
NewRigid in Samples
to PROJECT.
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New Rigid Pavement Design Example
• Pavement Structure:
– PCC Slab, P-501, R = 4.85 MPa
– Cement-Treated Base, P-304, 150 mm thick
– Crushed Aggregate Base, P-209, 200 mm thick
– Subgrade k = 27 MPa/m
• Traffic Mix:
– 5-Aircraft Mix includes B777, A340, A380
– Use the same traffic mix as the previous example.
May 30, 2018 FAARFIELD Design Examples 35
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Changing the Pavement Structure
May 30, 2018 FAARFIELD Design Examples 36
Click on Structure
button to bring up
the Structure screen.
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Change Pavement Structure
May 30, 2018 FAARFIELD Design Examples 37
In Structure window,
click on Modify
Structure
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Change Pavement Structure
May 30, 2018 FAARFIELD Design Examples 38
Change base layer to
150 mm CTB, P-304
Change P-209 layer
thickness to 200 mm.
Change subgrade k to
27 MPa/m
Change R to 4.85 MPa
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Change Pavement Structure
May 30, 2018 FAARFIELD Design Examples 39
Click “End Modify”
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Change Pavement Structure
May 30, 2018 FAARFIELD Design Examples 40
Click “Save Structure”
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Converting Subgrade k-Value to E
• FAARFIELD automatically
converts k to E, and vice-
versa.
• The new conversion formula
used in FAARFIELD 1.4 is:
k = 28.6926 × CBR0.7788
where: CBR = E / 1500
(E in psi, and k in psi/inch).
• Improved agreement with
field correlations.
• Less conservative than
previous formula when
converting from CBR data.
May 30, 2018 FAARFIELD Design Examples 41
0
50
100
150
200
250
300
0 5 10 15 20
k, p
ciCBR
Linear Regression NAPTF
ERDC Proposed update
k, FAARFIELD conversion k, PCA Conversion
New conversion formula
(FAARFIELD 1.4)
Old formula
(FAARFIELD 1.3)
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Enter Traffic Mixture
May 30, 2018 FAARFIELD Design Examples 42
Use the “Float
Aircraft” function to
repeat the traffic
mix.
Go to NewFlexible
section.
Click on “Airplane”
in NewFlexible
section.
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Aircraft Float List
May 30, 2018 FAARFIELD Design Examples 43
Click on “Save to
Float.”
This copies the
aircraft list to the
clipboard.
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Enter Traffic Mixture
May 30, 2018 FAARFIELD Design Examples 44
Return to the
NewRigid section.
Go to the Airplane
screen.
FAARFIELD
displays the default
aircraft list.
Clear the list by
clicking “Clear
List” then “Yes.”
Then click “Add
Float” to add the
float aircraft list.
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Enter Traffic Mixture
May 30, 2018 FAARFIELD Design Examples 45
The screen should
look like this.
Click “Save List”
and “Back” to
return to Structure.
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Run the Design
May 30, 2018 FAARFIELD Design Examples 46
Click “Design
Structure”
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Running the Design
May 30, 2018 FAARFIELD Design Examples 47
During the design
process, the
“Design Running”
clock will appear.
For rigid designs,
the design will
normally take a few
minutes. Don’t
interrupt the
process.
The screen display
will change with
each iteration.
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Final Design
May 30, 2018 FAARFIELD Design Examples 48
Thickness should be
rounded to nearest
cm (49 cm)
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PCC Stresses for Rigid Design
• FAARFIELD 1.4 compares maximum edge
stress and interior stress for all airplanes.
• The larger value is used in design.
• Output file NikePCC.out lists stress values:
May 30, 2018 FAARFIELD Design Examples 49
B737-800:
Design Stress = Edge Stress
B777-300ER:
Design Stress = Interior Stress
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Design Output
May 30, 2018 FAARFIELD Design Examples 50
Open file PROJECT_NewRigid.pdf in the working directory.
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Additional Aircraft Information
No. NameCDF
Contribution
CDF Max
for Airplane
P/C
Ratio
1 A320-100 0.00 0.00 3.84
2 A340-600 std 0.13 0.13 1.83
3 A340-600 std Belly 0.00 0.00 1.97
4 A380 0.00 0.00 3.82
5 A380 Belly 0.00 0.01 4.24
6 B737-800 0.00 0.00 3.52
7 B777-300 ER 0.87 0.87 3.87
May 30, 2018 FAARFIELD Design Examples 51
In this example, the B777-300ER
contributes the majority of
damage on the critical strip.
Presented to:
By:
Date:
Federal AviationAdministration
Introducing
FAARFIELD 1.42: Latest Updates to FAA Airport
Pavement Design Procedures
HMA Overlay Design Example
IX ALACPA Seminar on Airport Pavements
Quito, Ecuador
David R. Brill. P.E., Ph.D.
30 May 2018
Federal AviationAdministration
Copy an Overlay Section
May 30, 2018 FAARFIELD Design Examples 53
In the SAMPLES job,
copy the section
AConRigid to
PROJECT.
(drag and drop)
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Modify the Section
May 30, 2018 FAARFIELD Design Examples 54
In job PROJECT, select
Section AConRigid.
Click on Modify.
Modify the section
until it appears like the
image at right:
Overlay: 300 mm P-401
PCC Surface: 400 mm P-501
(R = 4.50 MPa)
Base: 125 mm P-403
Subbase: 300 mm P-209
Subgrade: E = 27 MPa/m
Existing PCC: SCI = 80
Click “End Modify.”
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Airplane Screen
May 30, 2018 FAARFIELD Design Examples 55
Click on “Airplane.”
Note that the B747-
200B consists of 2
lines, for the Wing and
Belly gears. These
lines are interlinked.
Changing the gross
weight or annual
departures on either
line affects the other.
This is a change from
version 1.305 (for
B747 or A380 series).
For this example, use
the default traffic
mixture.
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Run Overlay Design
May 30, 2018 FAARFIELD Design Examples 56
Click Back to return
to Structure Screen.
Click Design
Structure to execute
design.
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Final Overlay Design
May 30, 2018 FAARFIELD Design Examples 57
Final HMA overlay
thickness = 82.8 mm
Design would specify
90 mm
Now, what if the
HMA overlay is very
thick relative to the
existing concrete
slab?
Federal AviationAdministration
Thick HMA on Rigid Overlays
• Refer to AC 150/5320-6F, 4.10.5:
• When the overlay thickness exceeds the existing
slab thickness, the alternate flexible design option
may be more economical.
• FAARFIELD 1.42 will make this determination
automatically, if the option is selected.
May 30, 2018 FAARFIELD Design Examples 58
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FAARFIELD Options Screen
May 30, 2018 FAARFIELD Design Examples 59
Allow Flexible
Computation for Thick
Overlays on PCC
This option is “ON” by
default.
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Modify the Section
May 30, 2018 FAARFIELD Design Examples 60
Click on Modify.
Change the PCC
thickness from 400 in.
to 140 mm.
All other inputs are the
same.
Click “End Modify.”
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Run Overlay Design
May 30, 2018 FAARFIELD Design Examples 61
Click Design
Structure to execute
the design.
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Alternate Overlay Thickness
May 30, 2018 FAARFIELD Design Examples 62
Final HMA overlay
thickness = 168.2 mm
Click on “Back” and
then “Notes” to see
the design output.
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Design Information
May 30, 2018 FAARFIELD Design Examples 63
“Overlay thickness
was determined
using a flexible
design procedure,
considering the
existing PCC as a
high-stiffness base
layer. CDF is
determined for the
top of the
subgrade.”
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Standard Overlay Design
May 30, 2018 FAARFIELD Design Examples 64
If you deselect the
“Allow Flexible
Computation” option,
then the required
HMA overlay
thickness increases
to 514 mm.
Try it yourself!
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Thank You!
65
http://www.airporttech.tc.faa.gov/[email protected]
May 30, 2018 FAARFIELD Design Examples
Acknowledgments:
FAA Airport Technology R&D Branch:
Dr. Michel Hovan, Branch Manager;
Jeff Gagnon, Airport Pavement Section Manager;
Dr. Navneet Garg; Dr. Richard Ji; Al Larkin; Murphy Flynn; Ryan Rutter; Quinn Jia, Wilfredo Villafane
FAA Airport Engineering Division:
Doug Johnson; Greg Cline
SRA International:
Michael Collins; Dr. Izydor Kawa; Dr. Qiang Wang; Dr. Yuanguo Chen; Dr. Kairat Tuleubekov; Shawn
Hershman
Gemini:
Dr. Hao Yin