The effect of the infinite soil domain idealized by using transmitting and viscous boundaries on the dynamic behavior of concrete gravity dams

Abstract

The interaction between the structure and the soil on which the structure is built has a very effective effect on the structural behavior. It is unacceptable to consider the dynamic behavior of socioeconomically important structures such as dams independently of soil properties. However, the complex behavior of the infinite soil medium is not easy to idealize as the structural behavior of the dam. For this reason, in addition to the material properties of the infinite soil medium, the infinity feature should also be reflected in the structural modeling. In the finite element methods, where the interaction between the structure and the ground is taken into account, the size of the infinite soil medium causes artificial effects. Appropriate dimesions and boundary conditions should be selected for the soil domain so that artificial effects in the bounded soil domain do not affect the structural behavior. In this study, the effect of viscous and transmitting boundaries proposed for the soil-structure interaction studies was investigated. Sarıyar concrete gravity dam was taken into account for the numerical application. As a result of the study, it has been revealed that the viscous and transmitting boundaries used in dam-soil interaction studies reduce the solution cost and provide a more practical solution in dynamic analysis.

Keywords

• Transmitting boundaries
• Viscous boundaries
• Soil-structure interaction
• Concrete gravity dams

Geçirgen ve viskoz sınırlar kullanılarak idealleştirilen sonsuz zemin ortamının beton ağırlık barajların dinamik davranışına etkisi

Abstract

Yapı ve yapının üzerinde inşa edildiği zeminin karşılıklı etkileşimi yapısal davranış üzerinde oldukça etkili olmaktadır. Baraj gibi sosyoekonomik açıdan önemli yapıların dinamik davranışlarının zemin özelliklerinden bağımsız olarak ele alınması kabul edilemez. Fakat, sonsuz zemin ortamının kompleks davranışının baraj gövdesinin yapısal davranışı gibi idealleştirilmesi pek kolay değildir. Bu nedenle sonsuz zemin ortamının malzeme davranışının yanında, sonsuzluk özelliklerinin de yapısal modellemelerde yansıtılabilmesi gerekmektedir. Yapı ve zemin etkileşimin beraber olarak dikkate alındığı sonlu eleman çözüm yöntemlerinde sonsuz zemin ortamının boyutu suni etkilerin ortaya çıkmasına sebep olmaktadır. Sınırlı zemin ortamında ortaya çıkan suni etkilerin yapısal davranışı etkilememesi için zemin ortamı için uygun boyut ve sınır şartının seçilmesi gerekmektedir. Bu çalışmada yapı-zemin etkileşim çalışmaları için önerilen viskoz ve geçirgen sınırların etkisi araştırılmaktadır. Sayısal uygulama için Sarıyar beton ağırlık barajı dikkate alınmıştır. Yapılan çalışma sonucunda baraj-zemin etkileşim çalışmalarında kullanılan viskoz ve geçirgen sınırların çözüm maliyetini azalttığı ve dinamik analizlerde daha pratik çözüm sağladığı ortaya konmuştur.

Keywords

• Geçirgen sınırlar
• Viskoz sınırlar
• Yapı-zemin etkileşimi
• Beton ağırlık barajlar

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