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Αποτίμηση και ενίσχυση κτιρίου από φέρουσα τοιχοποιία με μη-γραμμική προσαυξητική δυναμική ανάλυση λαμβάνοντας υπόψη τον βαθμό κορεσμού του υπεδάφους

Lyratzakis Alexandros

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Summary

This master thesis was completed within the module of "Integrated Protection of the History Built Environment with Advanced Technology & Materials" of the postgraduate program "Space, Design & Built Environment" of the School of Architecture of the Technical University of Crete. The main purpose of this study is the seismic assessment of traditional masonry building's behavior taking into consideration the dynamic soil - foundation - structure interaction. The most advanced method of dynamic analysis, incremental non-linear dynamic analysis, is used to investigate the dynamic response of the structure. Moreover, the structural response in specific performance levels is examined by applying the methodology of the “Global Improvement” (Spyrakos, 2015).In recent years, the phenomenon of dynamic soil - foundation - structure interaction is taken into account more and more in the study of the seismic response of structures. Seismic norms worldwide have included some general guidelines. This is an important step towards a more accurate evaluation of dynamic structural response, which, however, needs further improvement. In related literature the existing studies investigate this interaction considering fully saturated or dry soil conditions. Nonetheless, in reality the soil saturation level is constantly changing and is directly dependent on external factors. For this reason, the current investigation aims to shed some light to the impact of the change in the bearing soil saturation degree on the response of the structure.The lack of relevant studies is due to the difficulty related to the accurate simulation of partially saturated soils. The variation in mechanical properties of soils depending on their degree of saturation has not been studied in a detailed manner up to now. Hence, the present study attempts an accurate simulation of the foundation subsoil. The examined typical traditional masonry building is constructed on a silty sand layer and the mechanical characteristics , as a function of the degree of saturation level of the soil, are taken from relevant studies (Byun et al., 2013).Epigrammatically, the present study aims to:- The accurate simulation of non-linear behavior of typical traditional existing masonry buildings.- The most accurate simulation of non-linear behavior of unsaturated soil.- The implementation of state-of-the-art simulation and analysis methods used mostly in the design of new structures (incremental non-linear analysis, dynamic soil - foundation - structure interaction) in the study of cultural heritage buildings.- Τhe evaluation of the impact of the degree of saturation of the subsoil on the structural response.- The determination of the so-called "Conventional Lifetime” of construction and the assessment of the effectiveness of potential retrofitting interventions.

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