Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Simulation of Ground Motions of Earthquake for Marmara Region
Turkey is located on a highly seismically active region that exposed frequently to earthquake risk. Both North Anatolian Fault (NAF) zone and East Anatolian Fault (EAF) zone have active seismicity and frequently produce earthquakes. Despite the well-known and experienced earthquake risk, it is observed that large magnitude earthquakes that occurred in recent years such as 1992 Erzincan, 1999 Kocaeli, 1999 Düzce and 2011 Van Earthquakes caused heavy devastation and serious loss of life and property. In order to minimize the eathquake induced loss of life and property and design cost-effective structures, the concept of Performance-Based Design has been recently developed in earthquake engineering. This concept aims of achieving the most safe and cost-effective design taking into account the damage and the risk by determining the damage of a modeled structure using numerical analysis methods. In this context, when the earthquake risk is considered, because of the absence or inadequate strong motion records in highly disaster risk areas, synthetic ground motion generation methods gained great importance in terms of the determination of the regions affected by the earthquake and performance-based design. Synthetic ground motion generation method includes the scaling of real strong motion records to site-specific design spectrum and strong motion simulation methods. But the most challenging problem in this issue occurs at the stage of selecting earthquake acceleration records for performance based design criteria, because the design guidlines have incapable suggestion and contain information for only upper structures. When the current studies reviewed, it is observed that the selection of earthquake acceleration records for only upper structures is described in terms of generation of synthetic records. In order to overcome this deficiency in the literature, two geotechnical problems are selected in Tekirdağ study region and the effect of syntetic record generation and selection on geotechnical design is studied. Synthetic records are generated by scaling real recorded accelerograms with determied design spectrum for Tekirdağ region and by scaling the same way of simulative acceleration records generated by using high frequency strong ground motion simulation method. The generated synthetic records are used in the analysis of steel and reinforced concrete quay wall piles and buried steel pipeline, and its effect on displacement and sectional force is discussed.