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    Comparison of one and three dimensional site response analyses
    (Pamukkale Üniversitesi, 2022) Timurağaoğlu, Mehmet Ömer; Fahjan, Yasin; Doğangün, Adem
    Site response analysis is based on determining how strong ground motions occurring in bedrock are affected by local soils above the bedrock. Although the local ground response is determined as a result of simplified one-dimensional linear analysis of the system, which is actually three-dimensional, it is insufficient to represent the nonlinear behavior of soil which exhibiting plastic behavior under small deformations. The equivalent linear analysis method is more commonly used among other methods (linear or non-linear) to represent the nonlinear behavior of the soil. However, two or three dimensional analyzes are required in cases where the soil environment varies in all three dimensions or does not consist of horizontal layers, and especially when soil-structure interaction will be applied. In this study, threedimensional modeling strategies are dwelled on and the effects of nonreflective boundary element lengths, dimensions of the soil (system), finite element size and the frequency range selected for damping on the response of the three-dimensional system are investigated. Onedimensional and three-dimensional soil behavior analysis results are compared with the studies in the literature in terms of the maximum ground acceleration, maximum displacement and response spectrum. As a result of the comparisons, it is revealed that the correctly generated three-dimensional model can be applied in determining the ground behavior in cases where one-dimensional analysis cannot be used.
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    Wave Propagation Approach for Dynamic Response Analysis of High-Rise Buildings
    (Bursa Uludağ Üniversitesi, 2022) Mehdi, Fikret; Doğangün, Adem; Fahjan, Yasin
    This paper numerically investigates the impact of considering the seismic wave propagation phenomenon on the dynamic response of high-rise buildings. A core wall and a frame are analyzed under seismic loading considering wave propagation phenomenon and ignoring it. The bending moment, shear force, axial force, and inter-story drift for both analyzed systems are evaluated. The amplitude Fourier response spectra for the dynamic response at different stories are discussed as well. Forty-six stories each, both systems are subjected to transverse and longitudinal seismic waves at the fixed base. The results show that considering the wave propagation phenomenon yields a slight decrease in the inter-story drift, shear force, and bending moment. It is found that considering wave propagation phenomenon increases the axial force significantly, especially for the core wall at the floors of the top third part. It is worth pointing out that high-rise buildings cannot be categorized, and every single different detail can trigger a different response. Thus, the main contribution of this paper is to highlight the drastic need to consider wave propagation phenomenon in such "out of code" buildings. The more important is a need to upgrade the standard analysis and design engineering packages to accurately capture the essential physics of the wave propagation phenomenon and perform the analysis precisely.