Page 120 - SAPEM-Chapter-10-2nd-edition-2014

South African Pavement Engineering Manual
Chapter 10: Pavement Design

Table 49. Functionality of the PADS series

Application Area Aspect/Functionality Comment
Design traffic Traffic data options Weigh-in-motion (WIM) data are read directly from the .RSA
estimation file format to provide vehicle loading and traffic volume inputs.
WIM axle load spectra (vehicle loading) may also be used in
conjunction with traffic counts (traffic volume) data. Axle
load spectra may also be generated from traffic count data in
combination with the load capacity utilisation of different
vehicle classes.
Pavement load sensitivity AASHTO power damage law or mechanistic-empirically derived
load sensitivity.
Design traffic estimation Estimated from the traffic input data described above as well
as traffic and vehicle loading growth rates.
Design investigation Input data Accommodates the following data:
• Lane configuration
• As-built structure information
• Test-pit and core data
• Visual condition assessment
• Rut
• Riding quality
• Deflection (FWD and Deflectograph)
• Dynamic Cone Penetrometer (DCP)
• Digital images
Data analysis options Multiple data views are provided.
The following data analysis options are provided:
• Deflection bowl parameter analysis
• Cumulative sum of difference analysis for analysis and
uniform section identification
• Automated backcalculation per user-defined uniform
section
• DCP single point and average point analysis per user-
defined uniform section
Data import, export and All input data are imported through Microsoft Excel
reporting spreadsheet templates or directly from the instrument files
e.g., .F25 or .FWD file format for the FWD.
Analysis results are exported to Microsoft Excel for further
manipulation.
Lane summary reports are generated showing the visual
condition assessment input data.
Lane summary reports are generated showing all the available
processed data on a stripmap for each lane aggregated
according to analysis section or uniform section.
A one-page summary report is generated per uniform section.
Pavement analysis Analysis engine GAMES (Maina, 2004) with unrestricted number of layers and
and modelling non-uniform contact stress distribution.
Analysis options Stress and strain results at 100 user-defined analysis points
Stress and strain profile plots and contour plots.
Material data and User defined material properties.
damage models Model formulation based on the 1996 SAMDM.
User definable calibration coefficients.
Structural capacity Allows for 3 distinct phases.
estimation
Simulation schemes Monte Carlo variability Possible but requires manual user-intervention.
simulation
Recursive damage Not available
modelling
Riding quality Not available
deterioration

Section 7: Structural Capacity Estimation: Flexible Pavements
Page 109