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Coordinating, Developing, and Delivering Highway Transportation Innovations

 
REPORT
This report is an archived publication and may contain dated technical, contact, and link information
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Publication Number:  FHWA-HRT-14-088    Date:  March 2015
Publication Number: FHWA-HRT-14-088
Date: March 2015

 

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

9. SAMPLE RESULTS

This chapter compares the DLR trace plots created using the Ohio SPS-1 DLR raw data, SDR 22.0 data, and the new Ohio SPS-1 and SPS-2 DLR database (temporarily designated as SDR 27.0) that was created using the methodology described in this report.

OHIO SPS-1 DATA SAMPLE PLOTS

Figure 19 to figure 21 show the sample plots for test section 390102 test J2C run 1 using the newly created SPS-1 and SPS-2 DLR database (temporarily designated as SDR 27.0) for Dyn12, LVDT1, and PC1 sensors, respectively. The newly created data appear to match the DLR raw traces.

For the strain gauges, the front axle pavement deflection peaks and valleys as well as their corresponding time stamps were included in the newly created SPS-1 and SPS-2 DLR database.(9) The front axle deflections were missing in SDR 22.0. It was suggested that the onset of a third valley near time point 1.8 s was not required to be included in the database because researchers will focus on the peaks and valleys in a trace. As a result, the SDR.0 27 Dyn12 raw trace in figure 19 goes directly from the second valley to the third valley without matching the DLR raw Dyn12 trace between the two valleys.

This graph shows the Dyn12 strain gauge traces for Ohio test section 390102 test J2C run 1 on August 5, 1996. The x-axis shows time and ranges from 0 to 4 s. The y-axis shows microstrain and ranges from -600 to 1,400 microstrains. The graph has three plots. The plot for dynamic load response Dyn12 raw data has three peaks ranging from 800 to 1,200 microstrains in the range of approximately 1.5 to 2 s. The plot for standard data release (SDR) 22.0 Dyn12 raw data has two peaks around 1,200 microstrains in the range of approximately 3.75 to 4.25 s. The plot for SDR 27.0 Dyn12 raw data has three peaks ranging from 800 to 1,200 microstrains in the range of approximately 1.5 to 2 s.
Figure 19. Graph. Dyn12 strain gauge traces for Ohio test section 390102 test J2C run 1 on August 5, 1996

 

This graph shows linear variable differential transformer (LVDT)-1 traces for Ohio test section 390102 test J2C run 1 on August 5, 1996. The x-axis shows time and ranges from 0 to 6 s. The y-axis shows microns and ranges from -500 to 2,000 microns, where 1 micron equals 3.93ï‚´10-5 inches. The graph has three plots. The plot for dynamic load response LVDT1 raw data has three peaks ranging from 900 to 1,800 microns in the range of approximately 2 to 2.5 s, the plot for standard data release (SDR) 27.0 LVDT1 raw data has three peaks ranging from 900 to 1,800 microns in the same range of approximately 2 to 2.5 s, and the plot for SDR 22.0 LVDT1 raw data has two peaks ranging from 1,600 to 1,800 microns in the vicinity of approximately 5 s.
1 micron = 3.93x10-5 inches
Figure 20. Graph. LVDT1 traces for Ohio test section 390102 test J2C run 1 on August 5, 1996

 

As shown in figure 20, only the peaks (but no valleys) and their corresponding time stamps were included in the SPS-1 and SPS-2 DLR database.(9)

This graph shows pressure cell (PC)-1 traces for Ohio test section 390102 test J2C run 1 on August 5, 1996. The x-axis shows time and ranges from 0 to 5 s. The y-axis shows kilopascals and ranges from -20 to 120 kPa, where 1 kPa = 0.145 lbf/inch2. The graph has three plots. The plot for dynamic load response PC1 raw data has three peaks around 100 kPa in the range of approximately 1.75 to 2.25 s, the plot for standard data release (SDR) 27.0 PC1 raw data has three peaks around 100 kPa in the same range of approximately 1.75 to 2.25 s, and the plot for SDR 22.0 PC1 raw data has two peaks around 100 kPa in the range of approximately 4.25 to 4.5 s.
1 kPa = 0.145 lbf/inch2
Figure 21. Graph. PC1 traces for Ohio test section 390102 test J2C run 1 on August 5, 1996

 

As shown in figure 21, only the peaks (but no valleys) and their corresponding time stamps were included in the SPS-1 and SPS-2 DLR database.(9)

OHIO SPS-2 DATA SAMPLE PLOTS

Figure 22 and figure 23 show the sample plots of test section 390201 test J1A run 2 using the newly created SPS-1 and SPS-2 DLR database (temporarily designated as SDR 27.0) for Dyn5 and LVDT1 sensors, respectively. The newly created data appear to match the DLR raw traces.

For the strain gauges, the front axle pavement deflection peaks and valleys as well as their corresponding time stamps were included in the newly created SPS-1 and SPS-2 DLR database.(9) The front axle deflections were missing in SDR 22.0.(6) It was suggested that the third valley near time point 2.0 s was not required to be included in the database. As a result, the SDR 27.0 Dyn5 smoothed trace in figure 22 goes directly from the second peak to the third peak without matching the third valley of the DLR Dyn5 raw trace between the two tandem axle peaks.

This graph shows Dyn5 strain gauge traces for Ohio test section 390201 test J1A run 2 on August 12, 1996. The x-axis shows time and ranges from 0 to 4 s. The y-axis shows microstrain and ranges from -15 to 30 microstrains. The graph has three plots. The plot for dynamic load response Dyn5 raw data has three peaks around 20 microstrains in the range of approximately 1.5 to 2 s, the plot for standard data release (SDR) 27.0 Dyn5 smoothed data has three peaks around 20 microstrains in the same range of approximately 1.5 to 2 s, and the plot for SDR 22.0 Dyn5 smoothed data has one peak around 20 microstrains at approximately 3 s.
Figure 22. Graph. Dyn5 strain gauge traces for Ohio test section 390201 test J1A run 2 on August 12, 1996

 

This graph shows linear variable differential transformer (LVDT)-1 traces for Ohio test section 390201 test J1A run 2 on August 12, 1996. The x-axis shows time and ranges from 0 to 4 s. The y-axis shows microns and ranges from -50 to 250 microns, where 1 micron equals 3.93ï‚´10-5 inches. The graph has three plots. The plot for dynamic load response LVDT1 raw data has one peak around 75 microns at approximately 1.5 s and two peaks around 125 microns at approximately 2 s. The plot for standard data release (SDR) 27.0 LVDT1 smoothed data has three peaks ranging from 55 to 125 microns at approximately the same locations, with one peak around 55 microns at approximately 1.5 s and two peaks around 125 microns at approximately 2 s. The plot for SDR 22.0 LVDT1 smoothed data is a little more than a single point around 225 microns at approximately 3.4 s.
1 micron = 3.93x10-5 inches
Figure 23. Graph. LVDT1 traces for Ohio test section 390201 test J1A run 2 on August 12, 1996

 

As shown in figure 23, only the peaks (but no valleys) and their corresponding time stamps were included in the SPS-1 and SPS-2 DLR database.(9)

 

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