Comparative analysis of strain and stresses obtained through backcalculation and instrumentation of a test track at BR 101 in Pernambuco
DOI:
https://doi.org/10.58922/transportes.v32i2.2949Keywords:
Structural analysis, Strain, Stress, Measuring instruments, BackcalculationAbstract
The need for the develop and improve systems for structural analysis for asphalt pavements has enabled the emergence of new instruments for evaluating mechanical performance. The instrumentation is based on the installation of sensors that make it possible to evaluate the mechanical performance of the structure through stress and strain readings. In asphalt pavement structures, temperature also becomes an important parameter to be evaluated in instrumentation. In this way, the instrumentation provides in-depth analysis of the pavement structure and the development of traffic efforts, as well as the understanding of its pathological manifestations. This research aimed to analyze the structural performance of a restructured section of BR-101 in the city of Recife through pavement instrumentation. Measuring instruments were installed in different layers of the pavement and software was developed to filter and organize the data received through the readings recorded for each vehicle. Finally, the non-destructive structural evaluation was performed using the FWD equipment. The sensors presented longitudinal strain in the order of 290 to 380 με, transverse strain of 270 to 290 με and the vertical stress determined by the strain cells averaged 964 kPa. It is verified that there is a strong influence of temperature on the behavior of the structure. Comparing the mean values obtained in the instrumentation with those calculated by means of backcalculation, similar results were observed between the strains and stresses found. Therefore, the use of pavement instrumentation proved to be an important methodology for analyzing the structural performance of the studied pavement, demonstrating stress and strain values like those found when using other analysis methods.
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