M. Cihan AYDIN, Ercan IŞIK, Alper DEMİRCİ, İbrahim Baran KARAŞİN

Coğrafik Konuma Özel Tasarım Spektrumlarının Betonarme Yapı Performansına Etkisi

Bir bölgenin depremselliği, yerel zemin koşulları ve yapısal özellikler yapıların deprem etkisi altındakidavranışlarını ve risklerini belirlemede kullanılan önemli parametrelerdir. Yapılar ile ilgili analizlerde o bölgenindepremselliği, spektrum eğrileri ile ifade edilebilmektedir. 2019 yılında yürürlüğe giren Türkiye Bina DepremYönetmeliği ile noktaya özel spektrum eğrileri kullanılmaya başlanmıştır. Bu çalışma kapsamında Türkiye’dekiyedi farklı coğrafik bölgeden birer il seçilerek coğrafik konumun hem deprem parametrelerine hem de yapıperformans hesaplamalarını hangi düzeyde etkilediği ortaya konmaya çalışılmıştır. Ankara, Antalya, Diyarbakır,Erzurum İstanbul, İzmir ve Samsun illeri için 50 yılda aşılma olasılığı %10 (tekrarlanma periyodu 475 yıl) olanve Türkiye Bina Deprem Yönetmeliği’nde DD-2 olarak belirtilen yer hareket düzeyi ile yerel zemin sınıfı ZEolarak dikkate alınmıştır. Her il için kısa periyot harita spektral ivme katsayısı, en büyük yer ivmesi, en büyük yerhızı, yerel zemin etki katsayıları, tasarım spektral ivme katsayıları ile yatay ve düşey elastik spektrum eğrisi içinhesaplamalar yapılmıştır. Çalışma ile farklı geometrik konumlarda bulunan fakat aynı zemin özellikleri ve yerhareketi olmasına rağmen deprem parametrelerinin değişimi incelenmiştir. Coğrafik konumun yapı performanshesaplamalarına etkisi ortaya koymak adına tüm illerde aynı yapısal özelliklere sahip yedi katlı betonarme bir yapıseçilmiştir. Seçilen örnek betonarme yapı için her il için analizler gerçekleştirilmiştir. Yapı analizinde zeminözelliklerinin dikkate alındığı statik adaptif itme analiz kullanılmıştır. Elde edilen tüm sonuç değerlerikarşılaştırılmıştır. Coğrafik konum değişikliği hem deprem parametrelerini hem de yapısal analiz sonuçlarıdoğrudan etkilemektedir. Çalışma, Türkiye Bina Deprem Yönetmeliğinin sahaya özel deprem parametrelerinin birkazanım olduğu sonucunu ortaya çıkarmıştır. Herhangi bir noktada yerel zemin koşulları ve yapısal özellikler aynıolsa bile bölgenin depremsellik öğelerinin dikkate alınması gerekmektedir.

The Effect of Site-Specific Design Spectra for Geographical Location on Reinforced-Concrete Structure Performance

Seismicity, local soil conditions and structural properties of a region are important parameters in order to determinate behavior of structures under earthquake impacts and seismic risks. The seismicity of that region can be expressed with spectrum curves in the analysis of the structures. Specific spectrum curves of specific points have begun to be used with '' Turkey Seismic Building Regulations '' which entered into force in 2019. In this study, the effect of geographical regions on both earthquake parameters and structure performance calculations was investigated by selecting one district in each different geographic region in Turkey. The probability of exceedance in 50 years 10% (repetition period of 475 years) for provinces of Ankara, Antalya, Diyarbakir, Erzurum, Istanbul, Izmir and Samsun and ground motion level DD-2 and the local soil class ZE as specified in the Turkey Building Earthquake Regulation are considered. Short period map spectral acceleration coefficient, maximum ground acceleration, maximum ground velocity, local ground effect coefficients, design spectral acceleration coefficients, horizontal and vertical elastic spectrum curve were calculated for each province. In this study, although the same ground characteristics and ground motion are found in different geographical locations, changes in earthquake parameters were investigated. A seven-storey reinforced concrete structure with the same structural features was selected in all provinces in order to reveal the effect of geographic location on building performance calculations. The analysis of the selected sample reinforced concrete structure was carried out for each province. In the structural analysis, static adaptive pushover analysis was used for soil properties were taken into consideration. All obtained results were compared. Geographical location change affects both earthquake parameters and structural analysis results directly. This study reveals, it is a gain that using site-specific seismic parameters according to updated Turkey Seismic Design Code. Even if local soil conditions and structural characteristics are the same at any point, seismicity elements of the region should be taken into consideration.

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