Strength and Ductility of Concrete Encased Composite Columns Under Axial Force and Moment

Abstract

The American Concrete Institute (ACI 318) specifies calculations and boundary requirements for the AISC-LRFD Specification, AISC Seismic Regulations and EN-1994 composite column design. Using these regulations, the inelastic behaviour of structural steel and concrete is explained by using the stress-strain properties of concrete under the influence of strength and winding. In this study, a composite column was designed by using section effects on a sample steel structure. The exemplary structure was chosen as the 9-storey Los Angeles building from the SAC buildings given in FEMA 355-C. The analyzes of the composite column were evaluated according to their strength and ductility properties. In this evaluation, the strengths, areas and stirrup parameters of the structural steel and concrete used in the composite column were determined proportionally. Looking at the ACI 318 and AISC-LRFD and EN-1994 regulations, there were differences in terms of nominal strengths. ANSYS finite element program was used to determine the behaviour of the composite column under compound influences. The sample column was analyzed in two different structural sections, structural steel and composite. Also, the effect of mesh size on the results in the finite element analysis of embedded composite columns, the unit strain and stresses of steel and composite columns under the same cross-section effects were compared.

Keywords

• Composite Column
• Steel Column
• Finite Element Method
• Collapse Mechanism

Eksenel Yük ve Moment Etkisi Altındaki Çelik Gömme Kompozit Kolonların Dayanımları ve Süneklikleri

Abstract

Amerikan Beton Enstitüsü (ACI 318), AISC-LRFD Şartnamesi, AISC Sismik Yönetmelikleri ve EN-1994 kompozit kolon tasarımına yönelik hesaplamaları ve sınır şartlarını belirtmektedir. Bu yönetmelikler kullanılarak, yapısal çelik ve betonun elastik olmayan davranışı betonun gerilme-şekil değiştirme özelliklerinin dayanım ve sargı etkisi altında değişimleri kullanılarak açıklanmıştır. Bu çalışmada örnek bir çelik yapı üzerinden alınan kesit tesirleri kullanılarak kompozit kolon tasarlanmıştır. Örnek yapı FEMA 355-C de verilen SAC binalarından 9 katlı Los Angeles binası olarak seçilmiştir. Kompozit kolona ait analizler dayanım ve süneklik özelliklerine göre değerlendirilmişlerdir. Bu değerlendirmede kompozit kolonda kullanılan yapısal çelik ve betonun ayrı ayrı dayanımları, alanları ve etriye aralığı parametreleri orantısal olarak belirlenmiştir. ACI 318 ve AISC-LRFD ve EN-1994 yönetmeliklerine bakıldığında nominal dayanımlar açısından farklılıklar olduğu görülmüştür. Kompozit kolonun bileşik etkiler altındaki davranışını belirlemek için ANSYS sonlu elemanlar program kullanılmıştır. Örnek kolon yapısal çelik ve kompozit olmak üzere iki farklı yapısal kesit olarak analiz edilmiştir. Ayrıca gömme kompozit kolonların sonlu elemanlar ortamında programlanmasında ağ sıklığının sonuçlara etkisi, aynı kesit tesirleri altında çelik ve kompozit kolonlarda oluşan göçme mekanizmaları ile birim şekil-değiştirme ve gerilmeleri karşılaştırılmıştır.

Keywords

• Kompozit Kolon
• Çelik Kolon
• Sonlu Eleman Analizi
• Göçme Mekanizması

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