Karbon Lifli Polimer Sargılı Narin Betonarme Kolonların Moment Büyütme Yöntemi ile Analizi

Öz

Bu çalışmada, karbon lifli polimer sargılı yüksek dayanımlı çelik lifli ve lifsiz betonarme kolonların davranışları incelenmiştir. Bu amaçla hazırlanan 8 adet çelik lifli ve lifsiz karbon fiber sargılı betonarme kolon numuneler iki eksenli eğilme ve eksenel yük altında test edilerek taşıma gücü kapasiteleri ve yük-deplasman eğrileri belirlenmiş ve aynı kolon numunelerinin teorik olarak da analizi gerçekleştirilmiştir. Analizde beton basınç bölgesi için literatürde yer alan sargılı beton gerilme-şekil değiştirme modeli kullanılmıştır. Ele alınan kolon numunelerin beton basınç dayanımı 53,13~76,76 MPa arasında değişmektedir. Test edilen kolon numunelerine ait dayanım, dış merkezlik, karbon lifli polimer malzeme özellikleri ve narinlik etkisi parametreleri yapılan analizlerde incelenmiştir. Analizde, narinlik etkisi ACI-318 yönetmeliği tarafından önerilen Moment Büyütme Yöntemi’ ne göre ele alınmıştır. Kolon numunelerin analizinden elde edilen sonuçların deneysel olarak elde edilen sonuçlarla uyum içinde olduğu gözlenmiştir.

Anahtar Kelimeler

• Süneklik,Çelik lifli beton,Karbon lifli polimer,Sargılı beton,İki eksenli eğilme

Analysis of Carbon Fiber Polymer Confined Slender Reinforced Concrete Columns by Using Moment Magnification Method

Öz

In this study, the behavior of carbon fiber polymer confined plain and steel fiber reinforced concrete columns were examined. For this purpose, carbon fiber polymer confined plain and steel fiber reinforced concrete column specimens were prepared and analyzed to determine the ultimate strength capacity and the load-deflection curves of columns. In the analysis, a stress-strain model for confined concrete was used for the concrete compression zone. Compressive strength of reinforced concrete column specimens are range from 53,13~76,76 MPa. In the analysis compressive strength, eccentricity, carbon fiber polymer material properties and parameters of slenderness effect were examined. In the analysis, slenderness effect of the column is taken into account by using Moment Magnification Method suggested by ACI-318 building code requirements for structural concrete. In conclusion the analysis and experimental results of carbon fiber reinforced polymer confined plain and steel fiber reinforced concrete columns have been achieved in good accuracy.

Anahtar Kelimeler

• Ductility,Steel fiber concrete,Carbon fiber polymer,Confined concrete,Biaxial bending

Kaynakça

1. 1. Dundar C., Tokgoz S., Tanrikulu A.K., Baran T., 2008. Behaviour of Reinforced and Concrete-Encased Composite Columns Subjected to Biaxial Bending and Axial Load, Building and Environment, 43(6): 1109-20.
2. 2. Mirmiran, A., Shahawy, M., 1997. Behavior of Concrete Columns Confined by Fiber Composite, Journal of Structural Engineering ASCE, 123(5):583590.
3. 3. Toutanji, H., Balaguru, P., 1998. Durability Characteristics of Concrete Columns Wrapped with FRP Tow Sheets, Journal of Materials Civil Engineering ASCE, 10(1):5257.
4. 4. Teng, J.G., Lam, L., 2002. Compressive Behavior of CFRP-Confined Elliptical Concrete Columns, Journal of Structural Engineering ASCE, 128(12):15351543.
5. 5. Samaan, M., Mirmiran, A., Shahawy, M., 1998. Model of Concrete Confined by Fiber Composites, Journal of Structural Engineering ASCE, 124(9):10251031.
6. 6. Hadi, M.N.S., 2006. Behaviour of FRP Wrapped Normal Strength Concrete Columns under Eccentric Loading, Composite Structures, 72(4):503511.
7. 7. Zaki, M.K., 2011. Investigation of FRP Strengthened Circular Columns under Biaxial Bending, Engineering Structures, 33:16661679.
8. 8. Vincent, T., Ozbakkaloglu, T., 2013. Influence of Fiber Orientation and Specimen end Condition on Axial Compressive Behavior of FRPConfined Concrete, Construction and Building Materials, 47:814826.

9. 9. Punurai, W., Hsu, C.T.T., Punurai, S., Chen, J., 2013. Biaxially Loaded RC Slender Columns Strengthened by CFRP composite Fabrics, Engineering Structures, 46:311321.
10. 10. Dundar C., Erturkmen D., Tokgoz S., 2015. Studies on Carbon Fiber Polymer Confined Slender Plain and Steel Fiber Reinforced Concrete Columns, Engineering Structures, 102:3139.
11. 11. Hognestad, E., Hanson, N.W., Mchenry, D., 1955. Concrete Stress Distribution in Ultimate Stress Design, ACI Journal, 27(4), 455-479.
12. 12. Hsu L.S.M., Hsu C.T.T.,1994. Stress-Strain Behavior of Steel Fiber High-Strength Concrete under Compression, ACI Structural Journal, 91(4):448–457.
13. 13. Tokgoz, S., 2009. Effects of Steel Fiber Addition on the Behaviour of Biaxially Loaded High Strength Concrete Columns, Materials and Structures, 42(8):11251138.
14. 14. ACI 318, 2008. Building Code Requirements for Structural Concrete, Detroit (MI), American Concrete Institute.