FAARFIELD 1.4. Updates, Improvements and New Capabilities. Federal Aviation Administration. 3 September, 2014
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1 FAARFIELD 1.4 Updates, Improvements and New Capabilities Presented to: XI ALACPA Seminar on Airport Pavements and IX FAA By: David R. Brill. P.E., Ph.D. Date: 3 September, 2014
2 Airport Technology R&D Program Research conducted at the FAA William J. Hughes Technical Center, Atlantic City, NJ, USA. Atlantic City, New Jersey, USA Sponsor: FAA Office of Airport Safety and Standards (AAS-100), Washington, DC. Provide support for development of FAA pavement standards (Advisory Circulars). Santiago de Chile 2
3 Airport Technology R&D Branch, ANG-E26 Dr. Michel Hovan, Branch Manager Airport Safety Section ANG-E261 Jim Patterson, Manager Visual Guidance Runway Surface Technology Aircraft Rescue and Firefighting (ARFF) Wildlife Hazard Mitigation Runway Incursion Reduction Planning and Design for New Large Aircraft (NLA) Airport Pavement Section ANG-E262 Jeffrey Gagnon, Manager Airport Pavement Design and Evaluation Aircraft/Airport Compatibility Advanced Pavement Materials Research Airport Pavement Maintenance and Management 3
4 Airport Pavement R&D Program R&D products are relied on worldwide by ICAO, aircraft industry & airport authorities. Four major R&D focal areas: 1. Pavement thickness design. 2. Aircraft/airport compatibility. 3. Airport pavement maintenance & management. 4. Advanced pavement materials.
5 National Airport Pavement Test Facility (NAPTF) Fully enclosed facility for accelerated traffic testing of airport pavements. Full-scale pavement structures and landing gear loads with programmed wander. Opened in Total construction contract was $21M. $14M from FAA $7M from Boeing Co. under FAA/Boeing CRDA. 5
6 Heavy Vehicle Simulator Airport Version (HVS-A) Wheel loads - 10,000 to 100,000 lbs. Pavement temperatures up to 150 F Test speeds to 5 mph Single and Dual-Wheel configuration. Single wheel is radial aircraft tires size 52x21.0R22 Dual wheel assembly is designed to accommodate smaller tires (B ) Manufactured in USA by Dynatest. 6
7 FAA Pavement Computer Programs BAKFAA COMFAA 3.0 FAA PAVEAIR FAARFIELD 1.3 LEAF ProFAA ProGROOVE Layered elastic back-calculation software for FWD Pavement strength reporting (ACN-PCN) Web-based airport pavement management system Pavement thickness design and evaluation Layered elastic analysis program (run from BAKFAA) Airport pavement roughness and profile analysis Groove analysis from longitudinal runway profile All programs are free to download, freely distributable, and available from: FAA PAVEAIR web site: 7
8 FAARFIELD 1.4 Beta version now available. Plan to release with next change to AC 150/5320-6E. Many significant changes. Reduces excess design conservatism. New design-based compaction procedure. Incorporates results of fullscale tests at the National Airport Pavement Test Facility. 8
9 FAARFIELD What Is It? Federal Aviation Rigid and Flexible Iterative Elastic Layered Design FAARFIELD is the new FAA airport pavement thickness design program. FAARFIELD superseded LEDFAA 1.3 as the standard design procedure in FAA Advisory Circular (AC) 150/5320-6E. Officially released September 30, Current version is (posted 1/18/11) 9
10 FAARFIELD 1.4 What s New? FAARFIELD 1.4 has: Completely revised flexible and rigid failure models based on newest full-scale test data. Reduced excess stabilized base thickness requirement. Improved, more accurate 3D finite element model. Completely rewritten concrete overlay design procedure. Automated, software-based compaction criteria. Updated aircraft library aligned with COMFAA 3.0. Support for user-defined gear configurations. Advanced, energy-based asphalt fatigue models. All data files now stored in document directories. 10
11 Flexible Pavements New thickness designs are generally less conservative than FAARFIELD designs for the same inputs. More compatible with COMFAA 1.3 (ACN-PCN method). Conventional Flexible Pavement Comparison Stabilized Flexible Pavement Comparison 11
12 Flexible Base Thickness The minimum stabilized base thickness is still 12.7 cm (5 inches). No additional stabilized base thickness requirement when improved subbase material (P-209) is used. Additional thickness requirement applies only if standard subbase (P-154) is used. 12
13 Rigid Pavements New thickness designs are generally less conservative than FAARFIELD designs for the same inputs. New calibrations incorporate CC6 failure data. Effect of Subgrade Modulus E Rigid Design Example 13
14 Improved Rigid Failure Model Sensitivity to factors such as concrete strength, traffic level and subgrade support is similar to current version Concrete Thickness, in Effect of Concrete Flex Strength Traffic Factor FAARFIELD FAARFIELD 1.41 Effect of Traffic 14
15 Improved 3D Finite Element Mesh More accurate stress results. Improved infinite foundation model. Still one slab model with assumed 25% load transfer. FAARFIELD FAARFIELD
16 Rigid Overlay Design Procedure Completely rewrote overlay life program module. Eliminated gaps and illogical results, especially for overlays on new or undamaged PCC. FAARFIELD FAARFIELD
17 Automated Compaction Criteria Computes compaction control points for rigid & flexible pavements. 17
18 Aircraft Libraries Aligned the aircraft libraries in COMFAA and FAARFIELD to the extent possible. Used the most current data from manufacturers. Included new aircraft: A (Preliminary) B747-8 B787-9 Embraer Fleet 18
19 Changes to Design Guidance Deployment of FAARFIELD 1.4 in next AC will require changes to parts of AC 150/5320-6E. Partial list of recommended changes: New guidance for applying automated compaction criteria. Changes to HMA fatigue criteria (new RDEC energy model). Revised shoulder design criteria. Modify conversion from CBR to k-value. Modified k-values for reduced subgrade strength (frost design) Guidance for use of external aircraft library. Modify Type A1 (reinforced isolation) joint detail. Update all design examples. 19
20 FAARFIELD 1.4 System/Software Requirements Minimum Windows XP or higher 2 GHz processor 2 GB RAM 200 MB of available space on hard drive. Recommended Windows 7 or higher* 3 GHz processor 4 GB RAM 64-bit operating system** Notes: *FAARFIELD 1.4 has not been fully tested on Windows 8. **FAARFIELD 1.4 supports 32-bit or 64-bit Windows operating systems. 20
21 Changes in Data File Storage All data files are now stored in document directories by default. Job files External aircraft library files Output files. C:\Users\[User Name]\Documents\FAARFIELD Previously, data files (including job files) were stored in the program directory. Required unrestricted read/write access for user. Risk of data loss when changing/upgrading PC. 21
22 External Aircraft Library A new feature allows users to specify arbitrary gear geometries in the external library. Coded as X in the external library. Allows multiple wheel groups to be defined. Uses rewritten internal pass/coverage computation routine. New user guidance for the external library. Wheel Group In this example, the externally defined A380 main gear gives the identical result as the internally stored airplane. 22
23 Future Developments FAARFIELD 2.0 (Rigid) Multiple-slab mesh. Variable joint spacing. Shear load transfer. Slab curling. Top-down slab stress. New rigid design considers: True slab size. Design thermal gradient. Critical position for full gear. Maximum tensile stress on slab surface. Currently in development. 23
24 Thank You! Muchas Gracias! Acknowledgments: FAA Airport Technology R&D Branch: Dr. Michel Hovan, Branch Manager; Jeff Gagnon, Airport Pavement Section Manager; Dr. Navneet Garg; Al Larkin; Dr. Charles Ishee; Murphy Flynn; Ryan Rutter; Quinn Jia, Wilfredo Villafane FAA Airport Engineering Division: Doug Johnson; Greg Cline SRA International: Jerry Connelly; Dr. Izydor Kawa; Dr. Qiang Wang; Dr. Yuanguo Chen; Dr. Kairat Tuleubekov, Jeff Stein Gemini: Dr. Hao Yin Consultants: Dr. Edward Guo; Dr. Maria Lopez; Roy McQueen; Dr. Shelley Stoffels 24
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