Akademik Veri Yönetim Sistemi
STRUCTURES, cilt.78, 2025 (SCI-Expanded, Scopus)
There are many cases of sequential earthquakes all over the world that have caused extensive damage and loss to the affected communities. The latest example is the recent 2023 Southeast Turkiye (also known as Kahramanmaras) earthquakes, which affected 11 populated cities in a short period of time. On the other hand, all design and analysis approaches in earthquake engineering are based on single earthquakes. Therefore this study focuses on the significance of sequential earthquakes on seismic response of conventional building typologies. The ultimate goal of this study is to assess the significance of sequential earthquakes and answer the questions like what are the common properties of events within the sequence to cause additional damage, which building types are the most affected ones from the sequential earthquakes and if there is an urgent need to revise seismic design and assessment methodologies to account for the effects of sequential events. For this purpose, an extensive ground motion database composed of 30 different sequential events from different parts of the world has been constructed. Since this study concentrates on the regional effects of sequential earthquakes rather than their effects on individual buildings, simplified structural models are employed to represent different classes of reinforced concrete (RC) and masonry buildings. A multi-parameter hysteretic model is used to carry out the dynamic analyses and obtain the response statistics. Structural variability is also taken into consideration. The obtained results reveal that sequential earthquakes, depending on the characteristics of the multiple events within the sequence, do really influence the damage state evolution in the considered building classes. Especially, sequential earthquakes cause damage evolution in moderate-code RC frame buildings by 15 %. In addition, most destructive sequential earthquakes are observed to be the ones with more than one event having M> 6.0 and magnitudes close to each other (i.e. MBRI>0.2) in addition to having closer distances to the epicenter of the considered event (distance<70 km). The results of this study indicate that some measures should be taken in future seismic codes in order to meet the increased demands on building structures when subjected to sequential earthquakes.