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Evaluation of selected load tests of ductile piles instrumented with distributed fibre optic sensors
Genzer, Christian ; Račanský, Václav (referee) ; Chalmovský, Juraj (advisor)
Despite the fact that the use of driven ductile piles is not as widespread in the Czech Republic as in surrounding countries, this method provides a fast and reliable solution for foundation structures. To verify and optimise the design, in-situ load tests are often carried out on a realistic scale. As a standard, string or resistance strain gauges are used to measure the resulting deformations. Although their use is cheap and relatively simple, the measured results do not provide a complex view of the behaviour of the structure over its entire length and with sufficient accuracy. Therefore, in recent years, the application of fiber optic-based measurement systems has been increasing. The goal of this bachelor thesis was to evaluate several load tests of driven ductile piles fitted with fibre optic sensor systems, considering a number of factors that negatively affect the measurement results. Examples of these include pile bending, measuring oscillations due to the technology of execution and the method of measurement, or the development of tension cracks in the grouting. For each load test, the site geology and test pile parameters were specified first. Afterwards, the technology of the performed load test was described and the results of standard monitoring were presented. Based on the measuring from distributed fibre optic sensors, the relative strain and axial force curves were constructed, from which the ultimate skin friction values were determined. These values were correlated with the driving times in each pile section and based on this relation the K_SHAFT coefficients were set. At the end of the thesis is presented a summary of the collected data and their comparison between each other.
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