Yer Hareketi Süresinin Zarf Spektrumu Tabanlı Değerlendirmelerde Yapısal Talep Üzerindeki Etkisi

Öz

Bu çalışma, zarf spektrumu tabanlı sismik değerlendirme yaklaşımları çerçevesinde, yer hareketinin süresinin elastik yer değiştirme talebi üzerindeki etkisini araştırmaktadır. Tek bir kuvvetli yer hareketi istasyonundan elde edilen kontrollü bir veri seti, saha ve yayılım etkilerinden kaynaklanan değişkenliği azaltmak amacıyla analiz edilmiştir. Kayıtlar, yer hareketinin toplam Arias enerjisinin %5 ile %95'i arasında geçen süreyi temsil eden önemli süre D_(5-95) kullanılarak kısa ve uzun süreli gruplara ayrılmıştır. Farklı yapısal periyotlar boyunca tepki spektrumları, zarf spektrumları ve maksimum elastik yer değiştirme taleplerini değerlendirmek amacıyla elastik tek serbestlik dereceli (SDOF) sistemler kullanılmıştır. Grup düzeyindeki karşılaştırmalara ek olarak, benzer tepe yer ivmesi seviyelerine ve genel olarak benzer spektral özelliklere sahip ancak süreleri belirgin şekilde farklı olan temsili bir yer hareketi kaydı çifti, süreye bağlı elastik tepki davranışını açıklamak amacıyla incelenmiştir. Sonuçlar, uzun süreli yer hareketlerinin, spektral özellikler genel olarak benzer olsa bile, özellikle orta periyot aralığında daha yüksek yer değiştirme talepleri ve daha fazla tepki değişkenliği oluşturabileceğini göstermektedir. Zarf spektrumları spektral ivmeleri başarılı şekilde sınırlasa da, elde edilen sonuçlar yalnızca spektral genlik temelli temsillerin süreye bağlı elastik yer değiştirme davranışındaki değişimleri tam olarak yansıtamayabileceğini göstermektedir. Elde edilen bulgular, spektrum tabanlı sismik değerlendirme prosedürlerinde süreye duyarlı parametrelerin dikkate alınmasının önemini ortaya koymaktadır.

Anahtar Kelimeler

• Yer hareketi süresi
• yapısal talep
• zarf spektrumu
• önemli süre
• tek serbestlik dereceli tepki

Effect of Ground Motion Duration on Structural Demand in Envelope Spectrum-Based Assessment

Öz

This study investigates the effect of ground motion duration on elastic displacement demand within the framework of envelope spectrum-based seismic assessment approaches. A controlled dataset consisting of ground motion records obtained from a single strong-motion station is analyzed to minimize variability associated with site and path effects. The records are classified into short- and long-duration groups using the significant duration D_(5-95), which represents the time elapsed between 5% and 95% of the total Arias energy of the ground motion. Elastic single-degree-of-freedom (SDOF) systems are employed to evaluate response spectra, envelope spectra, and maximum elastic displacement demands across different structural periods. In addition to group-level comparisons, a representative pair of ground motion records with comparable peak ground acceleration levels and broadly similar spectral characteristics, but significantly different durations, is selected to illustrate duration-related elastic response behavior. The results indicate that long-duration ground motions may produce higher displacement demands and greater response variability, particularly in the intermediate-period range, even when spectral characteristics are broadly similar. Although envelope spectra successfully bound spectral accelerations, the results suggest that spectral amplitude-based representations alone may not fully capture duration-related variations in elastic displacement response. The findings highlight the importance of considering duration-sensitive parameters in spectrum-based seismic assessment procedures.

Anahtar Kelimeler

• Ground motion duration
• structural demand
• envelope spectrum
• significant duration
• SDOF response

Kaynakça

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