Long-Term Pavement Performance Ohio SPS-1 and SPS-2 Dynamic Load Response Data Processing

4. DLR DATA

Ohio University (OU) submitted two datasets: the Ohio raw DLR data and the OU-processed DLR data. The raw DLR data contained the raw traces from each test job collected on SPS-1 and SPS-2 DLR test sections. The OU-processed DLR data had text files (e.g., EmbeddedSensor.txt, TruckPass.txt, TruckPeak.txt, etc.) pertaining to truck pass, truck run, truck peak, axle spacing, embedded senor, truck geometry, surface temperature, etc., for SPS-1, SPS-2, SPS-8, and SPS-9 test sections.

In this study, the DLR raw traces were collected by OPTIM Corporation's MEGADAC SERIES 3100 data acquisition system from the strain gauge, LVDT, and PC sensors for SPS-1 and SPS-2 test sections and were first converted to ASCII data format using TCS. To maintain consistency and clarity throughout this report, the term "DLR data" is used instead of ASCII formatted Ohio raw DLR data, and the term "Ohio data" is used for OU-processed DLR data in text files.

OHIO SPS-1 DATA

In the test summary provided in table 3, the SPS-1 DLR data contain a total of 34 tests, of which tests J2B, J8B, J8C, and J8F were empty, and tests J6J4K, J6J4L, J8J5K, J8J5L, J10BX, J10J9K, and J10J9L did not have information pertaining to sensor locations as was in OU text files EmbeddedSensor.txt, TruckPass.txt, and TruckPeak.txt in the SPS-1 data. Therefore, these 11 tests were excluded from processing due to incomplete information. A total of 23 tests were used for the SPS-1 DLR data processing. Each test had test files or runs in ASCII format. For example, test J2A had a total of 16 test runs named AJ2A.001 to AJ2A.016. Each test run contained raw traces collected by strain gauge, LVDT, and PC sensors.

The naming convention for a test run such as AJ2A.001 is as follows:

• The first letter, A, does not represent anything, as it is the same for all test runs.
  
  
• The second letter represents the test.
  
  
• The following number refers to the section (e.g., the "2" in J2 refers to test section 390102).
  
  
• The third letter represents visits to the site in alphabetical order (e.g., A for the first visit, B for the second visit, C for the third visit, etc.).
  
  
• The numeric extension is the test run number for that particular visit to that particular site.

Table 3 shows the test names, test run count, sensors count (number of sensors deployed for a particular sensor type for a particular test section), and sensors trace count.

Table 3 . SPS-1 DLR data trace count.

OHIO SPS-2 DATA

The SPS-2 DLR data contained a total of 24 tests. All of the tests were used for data processing. Table 4 shows the test names, test run count, sensor count (number of sensors deployed for a particular sensor type for a particular test section), and sensor trace count. The SPS-2 DLR data did not contain any data from PC sensors.

Table 4 . SPS-2 DLR data trace count.