NUMERICAL MODELING OF EFFECT OF TYPE OF CONFINEMENT TO BEHAVIOUR OF COLUMNS SUBJECTED TO EARTHQUAKE LOADING

Abstract

Columns are axially loaded elements subjected to reversed cyclic loading under earthquake The behavior of the columns becomes very important under the influence of this complex loading pattern. It has been observed that damage caused by collapse or heavy damage after earthquake are caused by lack of confinement. For this reason, the effect of confinement on column behaviour is one of important topics that attract researchers’ attention. In this study, numerical analyses have been performed by using open source object-oriented finite element software OpenSees by taking the experimental study that investigates effect of type of confinement to column behavior, which is performed by Saatçioğlu and Özcebe (1989) into consideration. When numerical analysis is performed, element and material models to represent the column specimens are correctly selected. The numerical models are analyzed under the effect of the earthquake loads, obtained results are compared with the mentioned study and it is observed that the results are consistent with each other.

Keywords

• Confinement type,Reversed cyclic loading,OpenSees

SARGILAMA TİPİNİN DEPREM YÜKLERİNE MARUZ KALAN KOLONLARIN DAVRANIŞINA ETKİSİNİN SAYISAL OLARAK MODELLENMESİ

Abstract

Kolonlar deprem etkisi altında tersinir ve tekrarlı yüklere maruz kalan eksenel yük elemanlarıdır. Bu karmaşık yükleme durumu etkisinde kolonların davranışının analizi oldukça önemli hale gelmektedir. Deprem sonrası göçme veya ağır hasara uğramış yapılarda, oluşan hasarların kolon sargılama eksikliklerinden kaynaklandığı görülmüştür. Bu sebeple sargılamanın kolon davranışına olan etkisi araştırmacıların ilgisini çeken önemli konular arasında yer almaktadır. Bu çalışmada, sargı tipinin kolon davranışına etkisini inceleyen Saatçioğlu ve Özcebe (1989) tarafından yapılmış kolon deneyleri numune olarak seçilerek, açık kaynak kodlu sonlu elemanlar programı OpenSees ile seçilen kolonların sayısal analizi yapılmıştır. Sayısal analiz yapılırken numuneleri doğru temsil edecek eleman ve malzeme modelleri seçilmiştir. Oluşturulan sayısal modeller deprem yükleri etkisi altında analiz edilmiş, elde edilen sonuçlar mevcut deneysel çalışmanın sonuçları ile karşılaştırılmış ve sonuçların birbiri ile uyumlu olduğu görülmüştür.

Keywords

• Sargılama tipi,Tersinir tekrarlı yükleme,OpenSees

References

1. Braga, F., Gigliotti, R., Laterza, M., 2006. Analytical Stess-Strain Relationship for Concrete Confined by Steel Stirrups and/or FRP Jackets. Journal of Structural Engineering, 132(9), 1402-1416.
2. Charalampakis, A.E., Dimou, C.K., 2013. Comparison of Evolutionary Algorithms for the Identification of Bouc-Wen Hysteretic Systems. Journal of Computing in Civil Engineering, 29(3), 04014053.
3. D’Amato, M., Braga, F., Gigliotti, R., Kunnath, S., Laterza, M., 2012. A numerical general-purpose confinement model for non-linear anlysis of R//C members. Computer and Structures, 102, 64-75.
4. El-Kholy, A.M., Dahish, H.A., 2016. Improved Confinement of Reinforced Concrete Columns. Ain Shams Engineering Journal, 7, 717-728.
5. Ismail, M., Ikhouane, F., Rodellar, J., 2009. The Hysteresis Bouc-Wen Model, A Survey. Archives of Computational Methods in Engineering, 16(2), 161-188.
6. Karavasilis, T.L., Sause, R., Ricles, J.M., 2012. Seismic Design and Evaluation of Steel Moment‐Resisting Frames with Compressed Elastomer Dampers. Earthquake Engineering and Structural Dynamics, 41(3), 411-429.
7. Khaleek, A., Yadav, R.K., Rajeev, C., 2012. Effect of Lateral Confinement on Strength of Concrete. ISCA Journal of Engineering Science, 1(1), 40-44.
8. Lejano, B.A., 2014. Confinement Effects of Different Retrofitting Materials on the Axial Strength of Reinforced Concrete Columns. 7th IEEE International Conference Humanoid, Nanotechnology, Information Technology Communication and Control, Environment and Management.

9. Mander, J.B., Priestley, M.J.N., Park, R., 1988(a). Theoretical Stress-Strain Model for Confined Concrete. Journal of Structural Engineering, 114(8), 1804-1826.
10. Mander, J.B., Priestley, M.J.N., Park, R., 1988(b). Observed Stress-Strain Behavior of Confined Concrete. Journal of Structural Engineering, 114(8), 1827-1849.
11. Mazzoni, S., McKenna, F., Scott, M.H., Fenves, G.L., 2006. Opensees Command Language Manual, Version 2, California University, California.
12. Osman, M., Soliman, A.E.K.S., 2015. Behavior of Confined Columns under Different Techniques. World Academy of Science, Engineering and Technology, International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering, 9(1), 70-78.
13. Parvin, P., Wang W., 2002. Concrete Columns Confined by Fiber Composite Wraps under Combined and Cyclic Lateral Loads. Composite Structures, 58, 539-549.
14. Paultre, P., Boucher-Trudeau, M., Eid, R., Roy, N., 2016. Behavior of Circular Reinforced-Concrete Columns Confined with Carbon Fiber–Reinforced Polymers under Cyclic Flexure and Constant Axial Load. Journal of Composite Construction, 20(3).
15. Saatcioglu, M., Ozcebe, G., 1989. Reponse of reinforced Concrete Columns to Simulated Seismic Loading. ACI Structural Journal, 86(1,) 1-13.
16. Saatcioglu, M., Razvi, S.R., 1992. Strength and Ductility of Confined Concrete. ASCE Journal of Structural Engineering, 118 (6), 1590-1607.
17. Sadeghian, P., Rahai, A.R., Ehsani, M.R., 2010. Experimental Study of Rectangular RC Columns Strengthened with CFRP Composites under Eccentric Loading. Journal of Composites for Construction, 14(4), 443-450.
18. Sato, H., Yamaguchi, K., 2000. Stress-strain Behavior of Square Confined Concrete Column. 12WCEE.
19. Sheikh, S.A., Uzumeri, S.M., 1982. Analytical Model for Concrete Confinement in Tied Columns. Journal of the Structural Division, 108, 2703-2722.
20. Subramanian, N., 2011. Design of Confinement Reinforcement for RC columns. The Indian Concrete Journal, 85(6), 19-29.
21. Thorhallsson, E.R., Bjarnason, P.V., 2012. Test of Rectangular Confined Concrete Columns for Strength and Ductility. In Proceedings of the 15th World Conference on Earthquake Engineering, Lisboa.