Enhancing Pavement Assessment with Dynamic Backcalculation: A Dynamic Finite Element Approach

Hajj, Elie Y; Skaff, Rami; Sebaaly, Peter E.; Ma, Xiaoxiang; Qin, Heyang; Yan, Feng; University of Nevada, Reno. Department of Civil and Environmental Engineering

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Enhancing Pavement Assessment with Dynamic Backcalculation: A Dynamic Finite Element Approach

2024-08-01
By Hajj, Elie Y ; Skaff, Rami ; Sebaaly, Peter E. ; ...

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Creators:

Hajj, Elie Y ; Skaff, Rami ; Sebaaly, Peter E. ; Ma, Xiaoxiang ; Qin, Heyang ; ... More +

Hajj, Elie Y ; Skaff, Rami ; Sebaaly, Peter E. ; Ma, Xiaoxiang ; Qin, Heyang ; Yan, Feng Less -
Corporate Creators:

University of Nevada, Reno. Department of Civil and Environmental Engineering
Corporate Contributors:

United States. Department of Transportation. Federal Aviation Administration
Subject/TRT Terms:

[+]

Asphalt Concrete Automated Optimization Framework Backcalculation BAKFAA CC-9 Flexible Test Item Constrained Optimization Damping (Engineering) Deflectometers Falling Weight Deflectometer Finite Element Method Forward Model FWD Parameters GUI Program Heavy Weight Deflectometer Impulses (Mechanics) Loads Master Curve Moduli Optimization Optimization Framework Pavement Analysis Pavement Performance Programming (Mathematics) PULSE_FE Structural Models Subgrade Damping Subgrade Materials Surface Deflections Surface Tension
Publication/ Report Number:

DOT/FAA/TC-24/13
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report
Contracting Officer:

Brynick, Matthew
Corporate Publisher:

United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center
Abstract:

The Heavy Weight Deflectometer(HWD)/Falling Weight Deflectometer (FWD) plays a crucial role in assessing pavement’s structural condition. It consists of applying an impulse load to simulate a moving wheel and measuring pavement surface deflections. Pavement variables, such as moduli, are determined through backcalculation, which involves a forward model and optimization. The FAA currently employs static analysis in the BAKFAA software but encounters limitations, particularly with thick and stiff airfield pavements. To address these challenges, a dynamic finite element (FE) model was developed under this study that incorporates subgrade damping to improve the reliability of backcalculation. The dynamic FE model was incorporated in a new tool called PULSE_FE to accelerate the computational runtime and improve efficiency. Dynamic backcalculation has been successfully applied to a Construction Cycle-9 flexible test item, and a parametric study has identified key FWD parameters for dynamic backcalculation. Furthermore, an optimization framework was established to streamline the dynamic backcalculation process, seamlessly integrating modeling, FE analysis, and multiple optimizers. Constrained optimization was employed to enhance the practicality of solutions. Additionally, a user-friendly graphical user interface (GUI) program for BAKFAA Dynamic Backcalculation (DynaBAKFAA) was designed to simplify the tasks from mesh generation to dynamic backcalculation. In summary, this project introduces a proficient FE model, advances in dynamic backcalculation, and an automated optimization framework, all poised to enhance pavement assessment and analysis. These developments are supported by a user-friendly interface designed for practical use.
Format:

PDF
Funding:

692M15-20-T-00032
Collection(s):

FAA Technical Library
Main Document Checksum:

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urn:sha-512:a874b043572946979f4dd515752b44657ed8d15bcc20f9a916e2b53cdb9696633884b6b6266390853b63776be0b41055c8b884a9581a3f06a51b814ec3ad8528
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https://rosap.ntl.bts.gov/view/dot/76965/dot_76965_DS1.pdf
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Enhancing Pavement Assessment with Dynamic Backcalculation: A Dynamic Finite Element Approach

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