Ölçeklendirme yönteminin ve sismik izolatör modelleme tekniğinin sismik izolatörlü bir yapının tepkisi üzerindeki etkisi

Yıl 2024, Cilt: 39 Sayı: 3, 1525 - 1540, 20.05.2024

Hakan Öztürk , Gökhan Özdemir

https://doi.org/10.17341/gazimmfd.1119686

Öz

Bu çalışmada zaman tanım alanında doğrusal olmayan (ZTADO) hesap yöntemi kullanılarak sismik izolasyonlu yapılarda yalıtım seviyesinde meydana gelen en büyük deplasman (MID), en büyük kuvvet (MIF) ve en büyük ivme (MA) değerleri dört farklı ölçeklendirme yöntemi dikkate alınarak incelenmiştir. Yalıtım birimi kurşun çekirdekli kauçuk izolatörler ile modellenmiş olup farklı yöntemler ile ölçeklendirilen deprem kayıtlarının her iki yatay bileşeni yalıtım birimine eş zamanlı olarak etki ettirilmiş ve çift doğrultulu analizler gerçekleştirilmiştir. Yürütülen analizlerde kurşun çekirdekli kauçuk izolatörler, kurşun çekirdekte ısınma etkisi nedeniyle meydana gelen dayanım kaybının dikkate alındığı (sıcaklık etkisi dahil, TI) ve alınmadığı durumlar (sınır analizler, LB-UB) için iki farklı yaklaşımla modellenmiştir. Analizlerde yalıtım birimi dayanımını temsilen dört farklı Q/W oranı (0.75, 0.90, 0.105 ve 0.120) ile izolasyon periyodunu temsilen beş farklı Tiso (2.5s, 2.75s, 3.0s, 3.25s ve 3.5s) dikkate alınmıştır. Sonuç olarak ölçeklendirme yöntemindeki farklılaşma maksimum izolatör kuvvetleri üzerinde önemli bir değişiklik yaratmazken, maksimum izolatör deplasmanları ve maksimum ivme değerlerinde %25’e varan değişimlere sebep olabildiği görülmüştür. Bu farklılaşma, sismik izolatörün nasıl modellendiğinden ihmal edilecek seviyede etkilenmektedir.

Anahtar Kelimeler

Sismik izolasyon, deprem kaydı ölçeklendirme yöntemleri, kurşun çekirdekli kauçuk izolatör, sınır analizler, çift doğrultulu analizler

Destekleyen Kurum

Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)

Proje Numarası

2218-118C510

Teşekkür

Bu çalışma, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK) 2218 programı kapsamında 118C510 numaralı proje tarafından desteklenmiştir.

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