Pavement Design and Evaluation

RPA P5

REDAC Subcommittee on Airports

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

March 15, 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.

March 15, 2017

2

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

March 15, 2017

Pavement Design & Evaluation

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Released Nov. 10, 2016

Federal Aviation

Administration

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FAARFIELD 1.4 – Release Version

March 15, 2017

Pavement Design & Evaluation

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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.

March 15, 2017

Pavement Design & Evaluation

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Federal Aviation

Administration

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FAARFIELD 1.41 Design Comparisons

March 15, 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

March 15, 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

In publication

Documents new FAARFIELD 1.41 design models

Federal Aviation

Administration

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FAARFIELD PCN Evaluation

March 15, 2017

Pavement Design & Evaluation

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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

March 15, 2017

Pavement Design & Evaluation

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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.

March 15, 2017

Pavement Design & Evaluation

10

Federal Aviation

Administration

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FAARFIELD Calling Structure

March 15, 2017

Pavement Design & Evaluation

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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.

Activities:

Draft framework – complete

GUI prototype demo – June 2017

March 15, 2017

Pavement Design & Evaluation

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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

March 15, 2017

Pavement Design & Evaluation

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ANN Development: Input Parameters

Federal Aviation

Administration

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Questions?

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March 15, 2017

Pavement Design & Evaluation

Federal Aviation

Administration

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