Effect of Pile-Soil Interaction on Earthquake Behavior and Fragility Curve of Wind Turbines

Abdullah Dilsiz; Ali Ruzi Özuygur

Makale detayları

Effect of Pile-Soil Interaction on Earthquake Behavior and Fragility Curve of Wind Turbines

Yazarlar:

Abdullah Dilsiz | Ali Ruzi Özuygur

Yayıncı:

Karyay Karadeniz Yayımcılık

Ana Başlıklar:

Deprem Mühendisliği | İnşaat Geoteknik Mühendisliği | Yapı Dinamiği

Dergi:

Black Sea Journal of Engineering and Science Vol.8 Issue 1, pp.234-242

Belge Tipi:

Makale

Yayın Tarihi:

1/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001331070

pISSN:

2619-8991

Anahtar kelimeler:

Özet:

 The seismic wave reached to the bedrock propagates toward the foundation through the soil above it. While part of the wave reflects back into the soil from the foundation interface, the rest is transmitted into the structure and reflects back to the ground from the top of the structure. This phenomenon interacts both the dynamic behaviors of the structure as well as the soil. This entire phenomenon is referred to as Soil-Structure Interaction SSI. There are numerous academic studies on SSI. The Turkish Building Earthquake Code TBEC includes detailed provisions regarding the seismic analysis of piled foundations considering SSI. In the simplest method adopted by TBEC, piles are modeled as frame elements; nonlinear horizontal and vertical springs are assigned at the nodes of these frame elements to represent the horizontal and vertical resistance of the soil; additionally, a nonlinear vertical spring is assigned at the bottom tip of the pile to represent the vertical resistance of the soil. The horizontal, vertical, and pile-tip resistance of the soil and their relating displacement properties are represented as p-y, t-z, and Q-z, respectively. In this study, the dynamic behavior of a wind turbine with a piled foundation has been examined for the following conditions: i the case that the nonlinear soil springs described above are used, and ii the case that the foundation is assumed to be a fixed support. For these two cases, fragility curves based on the lateral displacement of the turbine tower have also been derived. Numerical analyses have revealed that there are significant differences in the internal force demands of the tower, while the difference in the lateral displacement demands of the tower is negligible.

 The seismic wave reached to the bedrock propagates toward the foundation through the soil above it. While part of the wave reflects back into the soil from the foundation interface, the rest is transmitted into the structure and reflects back to the ground from the top of the structure. This phenomenon interacts both the dynamic behaviors of the structure as well as the soil. This entire phenomenon is referred to as Soil-Structure Interaction SSI. There are numerous academic studies on SSI. The Turkish Building Earthquake Code TBEC includes detailed provisions regarding the seismic analysis of piled foundations considering SSI. In the simplest method adopted by TBEC, piles are modeled as frame elements; nonlinear horizontal and vertical springs are assigned at the nodes of these frame elements to represent the horizontal and vertical resistance of the soil; additionally, a nonlinear vertical spring is assigned at the bottom tip of the pile to represent the vertical resistance of the soil. The horizontal, vertical, and pile-tip resistance of the soil and their relating displacement properties are represented as p-y, t-z, and Q-z, respectively. In this study, the dynamic behavior of a wind turbine with a piled foundation has been examined for the following conditions: i the case that the nonlinear soil springs described above are used, and ii the case that the foundation is assumed to be a fixed support. For these two cases, fragility curves based on the lateral displacement of the turbine tower have also been derived. Numerical analyses have revealed that there are significant differences in the internal force demands of the tower, while the difference in the lateral displacement demands of the tower is negligible.

 The seismic wave reached to the bedrock propagates toward the foundation through the soil above it. While part of the wave reflects back into the soil from the foundation interface, the rest is transmitted into the structure and reflects back to the ground from the top of the structure. This phenomenon interacts both the dynamic behaviors of the structure as well as the soil. This entire phenomenon is referred to as Soil-Structure Interaction SSI. There are numerous academic studies on SSI. The Turkish Building Earthquake Code TBEC includes detailed provisions regarding the seismic analysis of piled foundations considering SSI. In the simplest method adopted by TBEC, piles are modeled as frame elements; nonlinear horizontal and vertical springs are assigned at the nodes of these frame elements to represent the horizontal and vertical resistance of the soil; additionally, a nonlinear vertical spring is assigned at the bottom tip of the pile to represent the vertical resistance of the soil. The horizontal, vertical, and pile-tip resistance of the soil and their relating displacement properties are represented as p-y, t-z, and Q-z, respectively. In this study, the dynamic behavior of a wind turbine with a piled foundation has been examined for the following conditions: i the case that the nonlinear soil springs described above are used, and ii the case that the foundation is assumed to be a fixed support. For these two cases, fragility curves based on the lateral displacement of the turbine tower have also been derived. Numerical analyses have revealed that there are significant differences in the internal force demands of the tower, while the difference in the lateral displacement demands of the tower is negligible.

 Bir yapı konumunda, taban kayasına ulaşan sismik dalgalar, üstündeki zemin aracılığıyla temele doğru yayılır ve dalganın bir kısmı temel ara yüzünden zemine geri yansırken, diğer bir kısmı ise yapıya iletilir ve yapının tepesinden tekrar zemine yansır. Bu süreç hem zeminin ve hem de yapının dinamik davranış özellikleri ile de etkileşim içerisindedir. Bu olayın tamamına Zemin-Yapı Etkileşimi ZYE denilmektedir. ZYE hakkında çok sayıda akademik araştırma mevcuttur. Türkiye Bina Deprem Yönetmeliği TBDY kazıklı temellerinin ZYE ile deprem etkisi altında gerçekleştirilen analiziyle ilgili ayrıntılı hükümler içermektedir. TBDY tarafından benimsenen en basit yöntemde, kazıklar çubuk elemanlar olarak modellenir; çubuk elemanların düğüm noktalarına zeminin yatay ve düşey basınçlarını temsilen doğrusal olmayan yatay ve düşey yaylar tanımlanır; ayrıca kazığın alt ucuna zeminin düşey basıncını temsilen doğrusal olmayan düşey yay tanımlanır. Zeminin yatay, düşey ve kazık uç direnci için basınç-yerdeğiştirme ilişkisi sırasıyla p-y, t-z ve Q-z ile gösterilir. Bu çalışmada, kazıklı temele sahip bir rüzgâr türbininin dinamik davranışı, i yukarıda açıklanan doğrusal olmayan zemin yaylarının dikkate alındığı ve ii temelin ankastre mesnet kabul edildiği durumlar için incelenmiştir. Bu iki durum için ayrıca yatay yerdeğiştirmenin esas alındığı kırılganlık eğrileri elde edilmiştir. Yapılan sayısal analizler sonucunda rüzgâr türbini kulesi iç kuvvet istemlerinde önemli sayılabilecek farklılıkların oluştuğu, ancak kulenin yatay yerdeğiştirme istemindeki farkın ihmal edilebilir mertebede olduğu görülmüştür.

Makale detayları

Effect of Pile-Soil Interaction on Earthquake Behavior and Fragility Curve of Wind Turbines

Yazarlar:

Abdullah Dilsiz | Ali Ruzi Özuygur

Yayıncı:

Karyay Karadeniz Yayımcılık

Ana Başlıklar:

Deprem Mühendisliği | İnşaat Geoteknik Mühendisliği | Yapı Dinamiği

Dergi:

Black Sea Journal of Engineering and Science Vol.8 Issue 1, pp.234-242

Belge Tipi:

Makale

Yayın Tarihi:

1/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001331070

pISSN:

2619-8991

Soil-structure interaction

Pile-soil interaction

Pile foundation

Wind turbineZemin-yapı etkileşimi

Kazık-zemin etkileşimi

Kazıklı temel

Rüzgâr türbini

Sayı

Makale detayları

Yazarlar: Abdullah Dilsiz | Ali Ruzi Özuygur

Yayıncı: Karyay Karadeniz Yayımcılık

Ana Başlıklar: Deprem Mühendisliği | İnşaat Geoteknik Mühendisliği | Yapı Dinamiği

Dergi: Black Sea Journal of Engineering and Science Vol.8 Issue 1, pp.234-242

Belge Tipi: Makale

Yayın Tarihi: 1/2025

Belge Dili: Türkçe

Document ID (Org No.): 2001331070

pISSN: 2619-8991

Sayı

Yazarlar:

Abdullah Dilsiz | Ali Ruzi Özuygur

Yayıncı:

Karyay Karadeniz Yayımcılık

Ana Başlıklar:

Deprem Mühendisliği | İnşaat Geoteknik Mühendisliği | Yapı Dinamiği

Dergi:

Black Sea Journal of Engineering and Science Vol.8 Issue 1, pp.234-242

Belge Tipi:

Makale

Yayın Tarihi:

1/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001331070

pISSN:

2619-8991