A practical method for soil structure interaction

It is especially important to take into account the soil-structure interaction in the determination of the behavior of the structures resting on soft soils under earthquake loads. In this thesis the dynamic behavior of structures resting on 5 different soil types according to the Turkish Seismic Code (2018) were studied. For this purpose, planar frame and wall-frame structure samples were taken and the the soil structure interaction for both carrier system types was examined using four different models. In this study, the suitability of modeling of soil with rod elements and simplified approaches, which can be used as an alternative to modeling of soil with shell elements, was investigated. Two practical models have been developed for shear wall structures. The first model allows the building properties to vary along the height of the structure, and the soil properties can also vary across the layers, while the second model applies to systems in which the structure and soil properties are uniform. Free vibration analysis was performed with the models developed in the study and the periods were determined in less time. With the presented methods, it is possible to understand the soil structure interaction behavior that is overlooked with the increasing number of elements in classical finite element method with less parameters. The first part of the study is introductory and the second part includes the previous studies about the subject in the literature. In the third section, earthquake hazard of Kırklareli province is determined. In the fourth chapter, soil structure interaction is explained briefly. The fifth chapter includes the analysis of the methods developed in the thesis. SAP2000, MATLAB and SCILAB programs were used in the analyzes.