Pınar Sezin ÖZTÜRK KARDOĞAN, Nihat Sinan IŞIK

Sıvılaşan Zeminlerde Kazık Davranışına Dair Parametric Bir Çalışma

Tekrarlı yükler altında suya doygun kumlu zeminlerde meydana gelen sıvılaşma olayı yapısal hasarların meydana gelmesinde etkin rol oynamaktır. Taşıma gücü problemleri olan zeminler için kullanılan kazık temeller sıvılaşma olayından dolayı çeşitli hasarlara maruz kalabilirler. Bu çalışmada, dinamik yükler altında sıvılaşan zeminlerdeki kazık davranışı anlamak için sonlu farklar programı FLAC2D kullanılmıştır. Sıvılaşan ve sıvılaşmayan zeminin bulunduğu tabakalı zemin profilindeki tek bir kazık elemanı için yapılan numerik analizde 1999 Kocaleli deprem kaydı kullanılmıştır. Tabakalı zemin örneği içinde kullanılan kazık modelinin kazık başı dönmeye serbest hareketli olarak bırakılmıştır. Eksenel yük ve yatay yük aynı anda etkitilen tek kazık profili için hem kinematik etki hem de ataletsel etki göz önüne alınarak hesaplama yapılmıştır. Tabakalı zemin profilindeki sıvılaşan zemin üzerine sıvılaşmayan kabuk tabakası bulunması ve bulunmaması durumlarına göre kazık soketboyları değiştirilerek sonlu farklar analizleri gerçekleştirilmiş kazık başı deplasman değeri ve oluşan maksimum moment değeri sonuçları değerlendirilmiştir.

Anahtar Kelimeler:

Sıvılaşma, Kabuk tabakası, FLAC2D, Kazık soket derinliği, Ataletsel-Kinematik etki

A Parametric Study of Pile Behavior In Liquefied Soils

Liquefaction in saturated sandy soils under cyclical loads has a significant part in the structural damage cases. Pile foundations, used for soils with bearing capacity problems, might get exposed to various liquefaction-based damages. The finite element program FLAC2D is utilized to understand the pile behavior in liquefied soils under dynamic loads. The 1999 Kocaleli earthquake record was used in the numerical analysis for a single pile element in the layered soil profile with liquefied and non-liquefied soil. The pile-head of the model used in the layered soil sample was left free for rotation. Calculations for a single pile profile where axial load and horizontal load are affected simultaneously were performed by considering both the kinematic and inertial effect. Finite difference analyzes were performed by changing the embedded lengths of pile socket according to the existence and absence of a non-liquefying crust layer on the liquefied soil in the layered soil profile. As the results of the pile-head displacement and maximum moment value output were assessed.

Keywords:

Liquefaction, Crust layer, FLAC2D, Embedded length of pile, Inertial- Kinematic effects,

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