Dedicated software has been developed for post processing of data produced by the Traffic Speed Deflectometer. Measurements from a Greenwood TSD or a Greenwood multifunctional vehicle can be treated with the same post processing software package and synchronized results can be seen and exported.
Using the post processing software for a TSD measurement file the software shows result in 2D and/or 3D. When exporting results the software produces a files in text or excel format that, among other information, contains:
|• ||Temperature (air and road)|
|• ||Structural Curvature Index 300, SCI 300|
|• ||Maximum Deflection under the load|
The result file is based on a binary file created by the data recording software during measuring. Different settings such as the number of columns and the output frequency can be changed by the user. The user can select to operate in imperial units or metric units.
Below some of the different results are discussed:
The Doppler sensors measure the velocity of the deflection. The Deflection slope is the slope of the deflection, where the Doppler measure.
Maximum Deflection and Structural Curvature Index 300
Based on the Deflection slopes we can calculate bearing capacity characteristics.
The maximum deflection, d(0), is the deflection under the center of the load.
The Structural Curvature Index 300, SCI300, is d(0) minus the absolute deflection 300mm in front of the center of the load, d(300), that is SCI300 = d(0)-d(300).
Examples from network measurements
The graph below shows an example of the Structural Curvature Index 300 as a function of chainage (33 km) of the same Danish road section measured in 2005 (blue), 2006 (green) and 2007 (red). The road section between km 6 and km 7.5 was repaired between the measurements in 2005 and 2006.
New wearing course was added around km 20 between 2005 and 2006. The graphs for 2006 and 2007 are almost identical, and no road change has been made between these two measurements.
Examples of results
The figure below shows SCI300 data from app. 100 m of the same section of road measured at 4 different driving speeds.