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|Language of final thesis:||English|
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|Title of the thesis:||Soil structure interaction|
|Summary:||The goal of this thesis was to examine different methods on determining characteristic values of ground parameters, both the traditional way (EC7) and with statistics, through a comparison of the methods based on ground investigation results, as well as analytical and numerical solutions for soil-structure interaction. Generally, the determination of characteristic soil values is complex. As a consequence of its spatial variability and its local dispersion, there is much more uncertainty in soil properties. An attempt is made in this contribution to examine the different statistical frameworks which include the relevant parameters such as the mean value, the standard deviation (or coefficient of variation) and the scale of fluctuation. Typical and simplified statistical methods for the selection of characteristic values of geotechnical parameters are presented along as well as a comparison among them. Limit state design (LSD) in geotechnical engineering has been, recently, developed through EC7 in Europe. EC7 employs the partial resistance factor applied directly to each variable in resistance equation that individual soil properties are applied. In the limit state method, calculations were carried out using design values of loads, material properties and geometrical data that are derived from characteristic values using partial factors. The software GEO5 was used for the analyses. It becomes clear that the characteristic value cannot be quantified by a field and laboratory investigation alone, but is dependent on the spatial extent and the governing failure mechanism to be designed for. In addition, the comparison of the various methods for the characteristic value assessment showed that most of the computed values were not close to mean value and less conservative in the order of Student/Ovesen, Schneider/EG11 and EC7. Statistical methods are a reasonable instrument for determination of these characteristic values from the results of field and laboratory tests. Perhaps, application of statistical methods is the first step for a change to aspired probabilistic procedures in the future.|
|Key words:||Soil-structure interaction, characteristic value, geotechnical parameter, statistical methods|
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