Ph.D. Theses

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Browsing Ph.D. Theses by Subject "Buildings -- Vibration."

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    Effects of vertical component and spatial variation of ground motions on base isolated structures
    (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2023., 2023) Yılmaz, Cem.; Soyöz, Serdar.
    In this study, the effects of vertical component and spatial variation of ground motions on base isolated structures with friction pendulum type of seismic isolators were investigated. The base isolated structures can have relatively long plan dimensions. The long plan dimensions are mainly preferred because of two reasons. Firstly, base isolated structures can be more tolerant to thermal expansions compared to conventional fix-based buildings. Increasing thermal expansions depending on the length of the building can be tolerated in base isolated structures. Secondly, operational difficulties may arise when seismic expansion joints are created between base isolated blocks due to the requirement of a significant seismic gap distance between the blocks. However, structures with longer plan dimensions require the examination for additional issues. The spatial variation of ground motion which occurs as a result of increasing foundation dimension can cause the structure to be subjected to nonuniform ground motion. In the common approach, it is assumed that the ground motion is uniform at every point below the structure. However, as the foundation length of the structure increases, the effect of the spatial variation becomes more significant and induce nonuniform motion under the structure. In this study, the effect of nonuniform ground motion on base isolated structures with friction pendulum type of isolators was investigated. The vertical component of earthquakes is a determinant factor in the design of friction type seismic isolators and the magnitude of horizontal loads to be transferred to the structure. Therefore, the effects of both uniform and spatially varying distribution of the vertical component of earthquakes were separately examined.