Pavement Design and Evaluation

RPA P5

REDAC Subcommittee on Airports

David R. Brill, P.E., Ph.D.

August 16, 2017

Presented to:

By:

Date:

Federal Aviation

Administration

Federal Aviation

Administration

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RPA P5 – Pavement Design and Evaluation

Need

There is a need for advanced, computer-based pavement design & evaluation solutions to protect the FAA’s investment in airport pavement. The FAARFIELD program provides confidence that pavements will meet the required service life. Savings to the AIP will result from reduced construction costs and fewer runway closures.

Research Goals

Continue to update and modernize the FAARFIELD design software.

New ACN-PCN system of reporting airport pavement strength by FY17.

Incorporate top-down cracking mode in FAARFIELD rigid design by FY18.

Fully integrate FAARFIELD thickness design with LCCA procedures by FY22.

August 16, 2017

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FY 2016-7 Accomplishments

Released FAARFIELD v. 1.4.

Test new FAARFIELD-based ACN-PCN method.

Tech Report: Flexible pavement new subgrade failure model.

Prototype new FAARFIELD GUI.

Funding Requirements
| Project                            | Contract Funds ($K) |         |         |
|------------------------------------|---------------------|---------|---------|
|                                    | FY 2017             | FY 2018 | FY 2019 |
| P5. Pavement Design and Evaluation | 1200                | 1190    | 1235    |
| P5.1. Design Improvements          | 750                 | 740     | 870     |
| P5.2. ACN-PCN Improvements         | 250                 | 225     | 135     |
| P5.3. Analysis                     | 200                 | 225     | 230     |

Pavement Design & Evaluation

Federal Aviation

Administration

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AC 150/5320-6F & FAARFIELD 1.41

August 16, 2017

Pavement Design & Evaluation

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Released Nov. 10, 2016

Federal Aviation

Administration

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FAARFIELD 1.41

Released Nov. 10, 2016

Accompanies AC 150/5320-6F

FAARFIELD 1.41 workshops held:

Seattle, WA (AI)

Chicago, IL (AI)

Austin, TX (ISCP)

International:

Tel Aviv, Israel

Athens, Greece

Seoul, South Korea

Upcoming: Philadelphia, PA (ASCE T&DI Conference)

August 16, 2017

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Federal Aviation

Administration

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FAARFIELD 1.4 – What’s New?

Completely revised flexible and rigid failure models based on current NAPTF full-scale test data.

Reduced excess stabilized base thickness requirement.

Improved, more accurate 3D finite element model.

Completely rewritten concrete overlay design procedure.

Automatically generates PDF design report.

Automated, software-based compaction criteria.

Updated aircraft library aligned with COMFAA 3.0.

Include non-airplane vehicles in library (ARFF vehicles, etc.)

Support for user-defined gear configurations.

Advanced, energy-based asphalt fatigue models.

All data files now stored in document directories.

August 16, 2017

Pavement Design & Evaluation

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Federal Aviation

Administration

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FAARFIELD 1.41 Design Comparisons

August 16, 2017

Pavement Design & Evaluation

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Paper for ASCE Intl. Conference on Highway Pavements & Airfield Technology, Phila., August 2017

FLEXIBLE PAVEMENTS

RIGID PAVEMENTS

Federal Aviation

Administration

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Technical Reports

August 16, 2017

Pavement Design & Evaluation

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Replacement of FAARFIELD Tandem Factors with CDF Methodology

October 2016

Documents changes to evaluation of tandem gear damage

Development of New Subgrade Failure Model for Flexible Pavements in FAARFIELD

May 2017

Documents new FAARFIELD 1.41 design models

Federal Aviation

Administration

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FAARFIELD PCN Evaluation

August 16, 2017

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Directly uses FAARFIELD structure and traffic list.

NO alpha factor, layer equivalency factors, top-of-base k, etc.

Eventual replacement for COMFAA 3.0 & support spreadsheets.

Federal Aviation

Administration

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Flowchart of PCN Calculation

August 16, 2017

Pavement Design & Evaluation

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No more looping through all aircraft in the list!

Federal Aviation

Administration

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FAARFIELD-Based ACN/PCN

Accomplishments:

Created Visual Basic class library to compute layered elastic-based ACNs (rigid & flexible).

Replacement for legacy ICAO ACN computer programs.

Open source library – supports linking to any PCN program.

Defined input & output protocols.

Implemented PCN calculation in FAARFIELD 1.41.

New algorithm solves problem of computing PCN for mixed traffic (narrow bodies and LR aircraft) without unnecessary operating weight restrictions.

Seamlessly handles HMA overlays on flexible pavements.

On target for replacement ACN-PCN system with ICAO effective date in 2022.

August 16, 2017

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Federal Aviation

Administration

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Legacy Fortran Libraries

Existing Fortran libraries are modified from original 1995 programs.

Still distributed by FAA under a software sharing agreement with Lawrence Livermore National Laboratory, the original NIKE3D developer.

Very significant limitations for .NET programming.

Unmanaged code.

Not under the control of .NET memory management services.

May lead to memory conflicts or crashes at runtime. 

Obsolete data storage and retrieval methods.

Few young programmers have knowledge of Fortran.

August 16, 2017

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Federal Aviation

Administration

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FAARFIELD Calling Structure

August 16, 2017

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REPLACED BY:

FAAMeshClassLib

Visual Basic.NET Class Library

New Visual Basic.NET Class Library to replace NIKE3D.dll

In Progress (FY18)

Federal Aviation

Administration

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GUI Modernization

Modernize the FAARFIELD graphical user interface (GUI).

Job and section entry.

Improved start-up screen.

Improved screen re-sizing and appearance.

Improved flow between screens.

Rationalize data file structure.

Remove program logic from GUI controls.

Working GUI prototype was demonstrated July 2017.

FAARFIELD 2.0 beta – Target date July 2018. 

August 16, 2017

Pavement Design & Evaluation

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Federal Aviation

Administration

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FAARFIELD 2.0 GUI Screenshot

August 16, 2017

Pavement Design & Evaluation

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Federal Aviation

Administration

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Features of Modernized GUI

Multi-display interface.

Highly configurable process flow.

Consolidated data entry to single screen.

Open, resize, move, dock/undock, close screens independently.

Makes use of right-click context menus.

Resizable screens.

Allows working with multiple jobs & sections.

Switch between jobs/sections/pavement types with 1 click.

Cut and paste between jobs.

Standard Windows file management.

Built-in Windows tools for saving/opening jobs.

Section and job names follow Windows standards.

Built-in standard pavement section library accessible from menu.

August 16, 2017

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Federal Aviation

Administration

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Top-Down Cracking Mode (Rigid)

Current efforts are focused on artificial neural networks (ANN) for multi-slab model with curling.

Fast, accurate solutions within the defined problem space.

Grant to Iowa State U.

P.I. Dr. Halil Ceylan

2nd year of 3-year project.

Paper at 2017 TRB: 

Neural-Network Based Multiple-Slab Response Models for Top-Down Cracking Mode in Rigid Airport Pavements Subjected to Boeing B-777 Loading

August 16, 2017

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ANN Development: Input Parameters

Federal Aviation

Administration

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Questions?

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August 16, 2017

Pavement Design & Evaluation

Federal Aviation

Administration

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