Tasarım Davranış Spektrumunun Saha Etkisi Dikkate Alınarak Değerlendirilmesi: Kocaeli Bölgesi Uygulaması, Türkiye

Year 2024, Volume: 6 Issue: 1, 40 - 57, 30.04.2024

Yusuf Guzel , Fidan Güzel

https://doi.org/10.47112/neufmbd.2024.31

Abstract

Yeni yapılacak olan veya mevcut binaların güçlendirilmesinde deprem ivme hareketleri önemli bir rol oynamaktadır. Bu nedenle, modern deprem tasarım kodları, uygulama mühendislerine, farklı zemin sınıfları için standart tasarım davranış spektrumu sağlamaktadır. Bu çalışmada, yüksek depremselliğe sahip Kocaeli bölgesindeki EC8 ve TBDY tasarım davranış spektrumu uygulamaları değerlendirilmektedir. Bu amaçla, öncelikle Kocaeli bölgesinin depremselliği, 17 Ağustos 1999 (Kocaeli) depremini de dikkate alarak, sunulmuştur. İkinci olarak, bu iki kodun tasarım davranış spektrumları birbirleriyle ve dört farklı zemin sınıfında kaydedilen gerçek ivme hareketlerinin spektral davranış eğrileri ile karşılaştırılmıştır. Daha sonra iki betonarme bina modelleri davranış spektrum analizleri ile incelenmiştir. Geçmiş sismik hareketler göz önüne alındığında, bölgenin her zaman büyüklüğü 5.0'den büyük olan deprem olaylarına eğilimli olduğu görülmektedir. Ayrıca Kocaeli deprem ivme hareketlerinin zemin özelliklerine bağlı olarak değiştikleri gözlemlenmiştir. Bunun yanında, her iki deprem tasarım kodları da Kocaeli bölgesindeki her zemin sınıfında gerçek spektral değerlerini kapsayan tasarım davranış spektrumu sağlamaktadır. Bina analizlerinin sonuçları, EC8 tasarım tepki spektrumları ile elde edilen kesme kuvvetlerinin TBEC ve gerçek deprem spektral ivme değerlerinin kullanıldığı durumda elde edilen kesme kuvvetlerinden daha muhafazakar sonuçlar verdiği görülmektedir.

Keywords

Saha etkisi, Sismik tasarım kodları, Tasarım davranış spektrumu, Tasarım spektrum analizi, Zemin sınıfları

Considerations of Design Response Spectrum Involving Site Effect: Application to the Kocaeli Region, Türkiye

Abstract

Earthquake input motions perform critical role in the design of new or retrofitting of existing buildings. Therefore, modern seismic design codes guide engineering practitioners in delivering standard design response spectra for different soil classes. In this study, the applications of EC8 and TBEC design response spectra in the high-seismicity region of Kocaeli are evaluated. For that purpose, firstly, the seismicity of Kocaeli region involving the 17 August 1999 (Kocaeli) earthquake event is presented. Secondly, design response spectra of these two codes are compared with each other and with the spectral response curves of the actual input motions recorded at four different soil classes. Later, two reinforced concrete building models are analyzed by means of response spectrum analyses. Based on past seismic activities, the area is always prone to earthquake events, possibly occurring with magnitudes greater than 5.0. Also, the characteristics of the Kocaeli earthquake input motions were shown to be altered by the changes in the soil deposits. Besides, both seismic design codes are able to provide design response spectra covering the actual spectral values well at each soil class in the Kocaeli region. The results of building analyses suggest that the EC8 design response spectra offer more conservative building shear forces, followed by the TBEC and the actual ones.

Keywords

Design response spectrum, Response spectrum snalysis, Seismic design codes, Site effect, Soil classes

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