MOMENT-ROTATION CHARACTERISTICS AND FINITE ELEMENT ANALYSIS OF COLD FORMED STEEL CONNECTIONS

Öz

The connections are used to transfer forces and moments due to applied loading. The capability of the connection in the resisting moment is used to classify the types of connections in steelwork particularly for cold-formed steel. Classification schemes based on the total moment-rotation behavior have been developed to aid in the design and analysis of connections. Moment-rotation curve commonly used to describe the connection behavior that can be obtained from either theoretical or experimental study. It is often inappropriate to define the connections as either rigid or pinned due to their high non-linear behavior. Therefore, the lightweight cold formed steel connections have been classified into simple, semi-rigid, and rigid connections according to their strength and rigidity, and discussed in detail. Three-dimensional finite element model of lightweight cold formed steel connection under cyclic loading was generated to investigate and study their behavior. Two lipped sigma sections back-to-back with interconnections are used as beam and column members. Finally, the connection type of lightweight cold formed steel connections have been found to be as semi-rigid, and the key factors influencing stiffness is the bearing forces around the bolt hole. 

Anahtar Kelimeler

• Finite element analysis
• moment-rotation
• cold-formed steel
• rigidity

SOĞUK ŞEKİLLENDİRİLMİŞ ÇELİK BAĞLANTILARIN MOMENT-DÖNME ÖZELLİKLERİ VE SONLU ELEMAN ANALİZİ

Öz

Bağlantılar uygulanan yükleme nedeniyle kuvvetleri ve momentleri aktarmak için kullanılır. Taşıma momenti etkisindeki bağlantının kapasitesi, özellikle soğuk şekillendirilmiş çelik için çelik yapıdaki bağlantı türlerini sınıflandırmak için kullanılır. Bağlantının tasarımına ve analizine yardımcı olmak için toplam moment-eğrilik davranışına dayalı sınıflandırma şemaları geliştirilmiştir. Moment-dönme eğrisi, genellikle teorik veya deneysel çalışmadan elde edilebilecek bağlantı davranışını tanımlamak için kullanılır. Doğrusal olmayan davranışlarının yüksek olması nedeniyle bağlantıları ankastre veya sabit olarak tanımlamak genellikle uygunsuzdur. Bu nedenle, soğuk şekillendirilmiş çelik bağlantılar, mukavemetlerine ve rijitliklerine göre basit, yarı rijit ve rijit bağlantılar olarak sınıflandırılmış ve ayrıntılı olarak tartışılmıştır. Çevrimsel yükleme altında soğuk şekillendirilmiş çelik bağlantıların davranışlarını incelemek için üç boyutlu sonlu eleman modelleri oluşturulmuştur. Kiriş ve kolon elemanlar için sırt sırta iki sigma kesit kullanılmıştır. Son olarak, soğuk şekillendirilmiş çelik bağlantıların özelliklerinin yarı rijit olduğu ve rijitliği etkileyen anahtar faktörlerin bulon deliği etrafındaki ezilme kuvvetleri olduğu bulunmuştur.

Anahtar Kelimeler

• Sonlu eleman analizi
• moment-dönme
• soğuk şekillendirilmiş çelik
• rijitlik

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