Effect of column cross section and concrete compressive strength on the resistance of RC columns subjected to axial loads and loads created by creep

Year 2022, Volume: 11 Issue: 4, 999 - 1005, 14.10.2022

Abdulhamit Nakipoglu , Mohammed Gamal Al-hagrı , Mahmud Sami Döndüren

https://doi.org/10.28948/ngumuh.1088498

Abstract

Reinforced concrete buildings that are not properly designed, constructed, or supervised, might not have the resistance to bear even their own weight. When the effects of deformation in the concrete over time are added to the loads, great damages and even collapses can be seen. In this study, the performance of reinforced concrete buildings under axial loads was investigated. The effect of creep in concrete over time was also evaluated. Creep deformation has been integrated into the analysis with a simple method. A total number of 20 8-storey reinforced concrete frame buildings were modeled via ETABS. In each model, only column dimensions and concrete compressive strengths have been changed. The models were analyzed under the combined effect of axial loads and creep. As a result, the effect of concrete compressive strength and column dimensions on collapse in reinforced concrete buildings under the mentioned effects was examined. The results showed that column dimensions should be much high to prevent collapse when low strength concrete is used in buildings. In addition, a formula that can be used to determine the parameters of concrete quality and column cross-sectional areas required against collapse is proposed for the preliminary design of similar types of buildings.

Keywords

ETABS, Axial loads, Creep, Concrete compressive strength, Columns dimensions

Kolon enkesitinin ve beton basınç dayanımının eksenel yüklere ve sünmeden dolayı oluşan yüklere maruz kalan betonarme kolonlarda dayanıma etkisi

Abstract

Uygun şekilde tasarlanmayan, inşa edilmeyen veya denetlenmeyen betonarme binalar kendi ağırlığını bile taşıyacak dayanıma sahip olmayabilir. Yüklere, betonda zamanla meydana gelen deformasyon etkileri de eklendiğinde büyük hasarlar hatta çökmeler görülebilmektedir. Bu çalışmada, betonarme binaların eksenel yükler altındaki performansı araştırılmıştır. Betonda zamanla oluşan sünme etkisi de değerlendirilmiştir. Sünme deformasyonu basit bir yöntemle analize entegre edilmiştir. ETABS ile toplam 20 adet 8-katlı betonarme çerçeve bina modellenmiştir. Her bir modelde sadece kolon boyutları ve beton basınç dayanımları değiştirilmiş olup diğer tüm değerler ve ölçüler aynıdır. Modeller, eksenel yüklerin ve sünmenin birleşik etkisi altında analiz edilmiştir. Sonuç olarak, bahsedilen etkiler altında betonarme binalarda beton basınç dayanımı ve kolon boyutlarının göçmeye etkisi incelenmiştir. Sonuçlar, binalarda düşük dayanımlı beton kullanıldığında, kolon boyutlarının çökmeyi önlemek için çok yüksek olması gerektiğini göstermiştir. Ayrıca, benzer tipteki binaların ön tasarımı için çökmeye karşı gerekli olan beton kalitesi ve kolon kesit alanı parametrelerinin belirlenmesinde kullanılabilecek bir formül önerilmiştir.

Keywords

ETABS, Eksenel yükler, Sünme, Beton basınç dayanımı, Kolon boyutları

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