Basınçlı Tankların Sismik Kırılganlıklarının Gözlemsel ve Sayısal Olarak İncelenmesi

Öz

Bu çalışmada, küresel tanklar için zaman tanım alanında doğrusal olmayan analizler gerçekleştirilerek elde edilen sonuçlar ile geçmiş depremlerde gözlemlenen hasar verileri birleştirilerek kırılganlık eğrileri oluşturulmuştur. Ayrıca yatay silindirik tankların hasar verileri de derlenmiştir. Bu araştırmalar sonucunda küresel ve yatay silindirik basınçlı tanklar ile ilgili geçmiş depremlerden elde edilen gözleme dayalı hasar verilerinin atmosferik silindirik tanklara göre oldukça az sayıda olduğu görülmüştür. Bu sebeple özellikle küresel tanklar için veriler sayısal çalışmalarla desteklenmiş, gerçekleştirilen sayısal analizler sonucunda küresel tanklarda genel olarak çapraz elemanlarda gerilme yığılmalarının meydana geldiği ve bu elemanların kolonlarla bağlantı noktalarından koptukları gözlenmiştir. Analizlerden elde edilen hasar verilerinin de mevcut verilere eklenmesiyle küresel tanklar için geçerli kırılganlık eğrileri oluşturulmuştur. Yer hareketi şiddet ölçütü ile küresel tanklarda olası depremlerde meydana gelebilecek hasarların gerçekleşme olasılığı değerleri arasındaki bağlantının sunulduğu kırılganlık eğrilerinin gelecek çalışmaların geliştirilmesinde olumlu etkisinin olacağı düşünülmektedir.

Anahtar Kelimeler

• Kırılganlık eğrileri
• Küresel tank
• Yatay silindirik tank
• Dinamik analiz
• Sonlu eleman analizi

Observational and Numerical Investigation of Seismic Fragility of Pressurized Tanks

Öz

In this study, fragility curves were derivated by combining the results obtained in nonlinear time history analyzes and damage data observed in past earthquakes for spherical tanks. In addition, damage data of horizontal cylindrical tanks were collected. As a result of these studies, it has been observed that the observational damage data obtained from past earthquakes related to spherical and horizontal cylindrical pressure tanks are quite low compared to atmospheric cylindrical tanks. For this reason, data for spherical tanks have been supported by numerical studies. As a result of the numerical analysis, it was observed that in spherical tanks, stress concentrations occurred in the braced members and these elements ruptured at the connection points with the columns. By adding the damage data obtained from the analyzes to the existing data, the fragility curves for spherical tanks were created. It is thought that the fragility curves, which present the relationship between the ground motion intensity measure and the probability values of damages that may occur in possible earthquakes, will also have a positive effect on the development of future studies.

Anahtar Kelimeler

• Fragility curves
• Spherical tank
• Horizontal cylindrical tank
• Dynamic analysis
• Finite element analysis

Kaynakça

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