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.

Figure 19. Graph. Dyn12 strain gauge traces for Ohio test section 390102 test J2C run 1 on August 5, 1996

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⁾

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.

Figure 22. Graph. Dyn5 strain gauge traces for Ohio test section 390201 test J1A run 2 on August 12, 1996

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⁾