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Düşey deprem yer hareketinin yüksek binaların performansına etkisi
Throughout the history, the creation of new environments to support the needs of urban populations has been attained to a great extent through horizontal construction. When settlements with limited territories started to face rapid population growth, designers and government bodies started to give preference to vertical construction as it allowed urban growth within bounds. Vertical construction, also referred to as high-rise buildings, has quickly become an integral method for the development and expansion of settlements into urban areas, and cities into megacities. As the trend for construction moves from horizontal to vertical, there is a need for engineers to introduce new concepts and notions for the engineering of high-rise buildings that are safe and structurally sound. This study focuses on the effect of vertical components of ground motion records on the performance of a typical high-rise buildings. To see the effect of the vertical ground motion, 100 earthquake records are selected according to the source-to-site distance, site class, and earthquake magnitude. A generic high-rise reinforced concrete building designed according to Turkish Building Seismic Code (TBSC18) has been evaluated in terms of inter-story drift ratio, overturning moment, column axial force, and story shear force under the selected earthquake records. According to the nonlinear time history analysis, it was observed that the vertical ground motion has a very slighly effect in terms of interstory drift ratio, overturning moment and base shear. However, it is observed that the vertical ground motion has a significant effect on the axial force on columns as expected. Results show that axial force (both compressive and tension) on a column, normalized with column axial capacity, is increased by 20% in the near-field zone. The observed maximum increase in compressive force is around 105%, 57%, and 68% of the column axial capacity for site classes A,B, anc C, respectively. When the results are examined in detail it is seen that the influence of vertical ground motion increases significantly when the contribution of horizontal ground motion is small. The above observations prove that the effect of vertical ground motion should be included during seismic design of high-rise structures.
Türkiye'deki 6306 sayılı kanuna dayalı kentsel dönüşüm uygulamalarının fiziksel dirençliliği üzerine bir çalışma
The physical development that ignores the unique dangers of Turkey in the process of urbanization and subsequent urban transformation which has created today's settlements consisting of large risk pools. This is due to disasters with great loss, especially earthquakes; the intervention of a non-market hand, in other words, the intervention of the state was inevitable. This intervention was aimed to be done with the Law Numbered 6306 published in the Official Gazette on May 31, 2012. The law was enacted with the name of "Transformation of Areas Under Disaster Risk", taking into account the effect of legal legislation on transforming physical space as an urbanization strategy. The basis of this study is based on that research question "Do the urban transformation implementations applied in risky areas in Turkey within the scope of Law Numbered 6306 actually eliminate the disaster risk and increase the physical resilience in accordance with their original purpose? Therefore, within the scope of this law study, only the "Risky Areas" are focused on, rather than risky buildings and reserve areas that are defined in the Law. Risky areas, on the other hand, were examined considering mainly their spatial characteristics and standards. As a result of these studies, although the structural problems of buildings were overcome in the urban transformation implementations carried out with the 6306, it was observed that the urban problems which indicate an increase in disaster risks instead of an overall reduction within the understanding of resilient cities became profounder in all layers.