Modern betonarme minareler için ölçekli gerçek deprem kayıtlarının ve Türk Deprem Yönetmeliği (DBYBHY, 2007) tasarım spectrum karşılaştırılması

Due to rapid developments in structural analysis and computational facilities, using real Earthquake records for analysis is becoming more common in seismic analysis and design of structures. One of the crucial issues of such analysis is the selection of acceleration time histories to satisfy design code requirements and soil type at a specific site. In literature, there are three sources of acceleration time histories: design response spectrum compatible artificial records, synthetic records obtained from seismological models and Strong Motion Records recorded in real earthquakes. Due to the increase of available strong ground motion database, using and scaling real recorded Strong Motion Records is becoming one of the most contemporary research issues in this field. Time history-analysis of building structures have been used for a quite long time for research at universities. Considering the advantage of time-history analysis relative to the equivalent static force method, the National Building of Turkey and other modern building codes around the world require the use of time-history analysis in the design of specified types of buildings located in seismic regions. One of the main issues in the use of time-history analysis is related to the selection and scaling of the seismic excitations (i.e., accelerograms) to be compatible with the design spectrum for the location considered. Currently, both recorded (i.e., "real") accelerograms and artificial accelerograms are used in the analysis. The objective of this study is to determine the effects of the selection and scaling of seismic excitations on the response of reinforced concrete Minarets. Four cases of reinforced concrete Minaret with the total height of 90 and 71 meters, designed for Istanbul (high seismic zone) was used in this study. Four sets of seismic excitations were used in the analysis – 4 set of "real" accelerograms, obtained by different methods. All sets were scaled to be compatible with the design spectrum for Istanbul. Drifts Along the height and Moments on transition sections were used as response parameters. The results from the linear analysis show that the type of the excitation set affects both the Drifts Along the height and the Moments on transition sections significantly. Based on the results from this study, sets of scaled real records are preferred for use in time-history analysis of building structures. If such records are not available, then sets of simulated accelerograms based on the regional seismic characteristics should In this study, basic methodologies and criteria for selecting strong ground motion time histories are discussed and summarized as well as some scaled records are used for comparison with the Turkish code for the Modern day Reinforced concrete minarets. The time domain-scaling procedure is utilized to scale, the available real records to match the proposed elastic design spectrum given in the Turkish earthquake code (DBYBHY, 2007) for different seismic regions and soil types. The best-fitted ground motion time histories are selected and classified taken into account the earthquake magnitude, focal mechanism and site conditions.