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From page 466... ... I-1 APPENDIX I ANALYSIS METHODOLOGIES OF LARGE-SCALE TANK TEST DATA The laboratory testing program for flexible and rigid pavements included a series of instrumentation that included accelerometers, LVDTs, earth pressure cells, and strain gauges. Read the entire page →
From page 467... ... I-2 example, features such as the use of low/high pass filters, baseline correction, and zero-th order correction significantly affect the results of the integration. The suitability of various options of the integration procedure for use with impact-type loading should be verified. Read the entire page →
From page 468... ... I-3 Figure I-1. Schematic of the pilot experimental study to calibrate the integration scheme Figure I-2. Read the entire page →
From page 469... ... I-4 Figure I-3. Vertical LVDT measurements from pilot experimental study (loading cycles 49 to 55) Read the entire page →
From page 470... ... I-5 Figure I-5. Measured displacement history from pilot experimental study (DIS 1) Read the entire page →
From page 471... ... I-6 Figure I-7. Fourier transform of ACC 1 recording measurements An attempt at integration with baseline correction (cubic polynomial) Read the entire page →
From page 472... ... I-7 Figure I-9. Comparison between measured and computed maximum displacements for 18 recording measurements with baseline correction Use of only the acceleration history after the initiation of the pulse as recommended by Irwin et al. Read the entire page →
From page 473... ... I-8 undertaken between measured and integrated displacements to verify the appropriateness of the integration scheme. Figure I-10. Read the entire page →
From page 474... ... I-9 Figure I-12. Measured and double-integrated displacement history with zero-th order correction Figure I-13. Read the entire page →
From page 475... ... I-10 Figure I-14. Measured and double-integrated displacement histories for a sampling frequency of 16,666 Hz with selected time history interval (0.3 to 0.9 second) Read the entire page →
From page 476... ... I-11 Table I-1. Comparison of Double-Integrated Displacement Results with Various Sampling Frequencies Time Spacing (sec) Read the entire page →
From page 477... ... I-12 Figure I-15. Measured and double-integrated displacement histories for a sampling frequency of 2083 Hz with selected time history interval (0.3 to 0.9 second) Read the entire page →
From page 478... ... I-13 measurements after the completion of the entire dynamic loading. However, this was not successful, mainly because it turned out that the noise was truly random. Read the entire page →
From page 479... ... I-14 Based on the attempts to perform double integration of the accelerometer measurements described above, the following iterative procedure was adopted for integration in this study: • Step 1: From the entire plot of measured vertical acceleration response at the loading plate (referred to as A1 subsequently) , select as many as seven consecutive cycles that look similar beyond 50 cycles of loading. Read the entire page →
From page 480... ... I-15 Figure I-17. Instrumentation plan for large-scale tank Experiment No. Read the entire page →
From page 481... ... I-16 match was found between the computed (i.e., double-integrated acceleration) and the LVDT measurements at a surface location, the integration procedure was used for the accelerometers located directly below that location. Read the entire page →
From page 482... ... I-17 Figure I-20. Comparison between measured (L1) Read the entire page →
From page 483... ... I-18 Figure I-22. Comparison between measured (L2) Read the entire page →
From page 484... ... I-19 Figure I-24. Comparison between measured (L1) Read the entire page →
From page 485... ... I-20 Figure I-26. Comparison between measured (L3) Read the entire page →

From page 466...

... I-1 APPENDIX I ANALYSIS METHODOLOGIES OF LARGE-SCALE TANK TEST DATA The laboratory testing program for flexible and rigid pavements included a series of instrumentation that included accelerometers, LVDTs, earth pressure cells, and strain gauges.