Effect of corner radius and aspect ratio on compressive behavior of rectangular concrete columns confined with CFRP

详细信息    查看全文

• 作者：Davood Mostofinejad ; Niloufar Moshiri ; Nasrin Mortazavi
• 关键词：CFRP confinement ; Rectangular concrete column ; Corner radius ; Aspect ratio ; Finite element ; Tsai–Wu’s failure criterion
• 刊名：Materials and Structures
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：48
• 期：1-2
• 页码：107-122
• 全文大小：1,718 KB
• 参考文献：1. Harajli MH (2006) Axial stress–strain relationship for FRP confined circular and rectangular concrete columns. Cem Concr Compos 28(10):938-48 CrossRef
  2. Chaallal O, Hassan M, Shahawy M (2003) Confinement model for axially loaded short rectangular columns strengthened with CFRP wrapping. ACI Struct J 100(2):215-21
  3. El Maaddawy T, El Sayed M, Abdel-Magid B (2010) The effects of cross-sectional shape and loading condition on performance of reinforced concrete members confined with carbon fibre-reinforced polymers. Mater Des 31(5):2330-341 CrossRef
  4. Yang X, Nanni A, Chen G (2001) Effect of corner radius on performance of externally bonded FRP reinforcement. In: Non-metallic reinforcement for concrete structures. Proceedings of the fifth international symposium on fiber reinforced polymer for reinforce concrete structures (FRPRCS-5), Cambridge, 16-8 July, p 197-04
  5. Kumutha R, Vaidyanathan R, Palanichamy MS (2007) Behaviour of reinforced concrete rectangular columns strengthened using GFRP. Cem Concr Compos 29(8):609-15 CrossRef
  6. Maalej M, Tanwongsval S, Paramsivam P (2003) Modelling of rectangular RC columns strengthened with FRP. Cem Concr Compos 25(2):263-76 CrossRef
  7. Wu Y-F, Wei Y-Y (2010) Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns. Eng Struct 32(1):32-5 CrossRef
  8. Mirmiran A, Shahawy M, Samaan M, El-Echary H (1998) Effect of column parameters on FRP-confined concrete. ASCE J Compos Constr 2(4):175-85 CrossRef
  9. Pessiki S, Harries KA, Kestner JT, Sause R, Ricles JM (2001) Axial behavior of reinforced concrete columns confined with FRP jackets. ASCE J Compos Constr 5(4):237-45 CrossRef
  10. Silva MAG (2011) Behavior of square and circular columns strengthened with aramidic or carbon fibers. Constr Build Mater 25(8):3222-228 CrossRef
  11. Mandal S, Hoskin A, Fam A (2005) Influence of concrete strength on confinement effectiveness of fiber-reinforced polymer circular jackets. ACI Struct J 102(3):383-92
  12. Toutanji H (1999) Stress–strain characteristics of concrete columns externally confined with advanced fiber composite sheets. ACI Mater J 96(3):397-04
  13. Saafi M, Toutanji HA, Li Z (1999) Behavior of concrete columns confined with fiber reinforced polymer tubes. ACI Mater J 96(4):500-09
  14. Teng JG, Huang YL, Lam L, Ye P (2007) Theoretical model for fiber-reinforced polymer-confined concrete. ASCE J Compos Constr 11(2):201-10 CrossRef
  15. Toutanji H, Han M, Gilbert J, Matthys S (2010) Behavior of large-scale rectangular columns confined with FRP composites. ASCE J Compos Constr 14(1):62-1 CrossRef
  16. Chastre C, Silva MAG (2010) Monotonic axial behavior and modelling of RC circular columns confined with CFRP. Eng Struct 32(8):2268-277 CrossRef
  17. Tamu?s V, Tepfers R, Spārnin? E (2006) Behavior of concrete cylinders confined by a carbon composite 2. Prediction of strength. Mech Compos Mater 42(2):109-18 CrossRef
  18. Tamu?s V, Tepfers R, Zīle E, Ladnova O (2006) Behavior of concrete cylinders confined by a carbon composite 3. Deformability and the ultimate axial strain. Mech Compos Mater 42(4):303-14 CrossRef
  19. Mirmiran A, Zagers K, Yuan W (2000) Nonlinear finite element modeling of concret
• 作者单位：Davood Mostofinejad (1)
  Niloufar Moshiri (1)
  Nasrin Mortazavi (1)
  
  1. Department of Civil Engineering, Isfahan University of Technology (IUT), 84156-83111, Isfahan, Iran
  
• 刊物类别：Engineering
• 刊物主题：Structural Mechanics
  Theoretical and Applied Mechanics
  Mechanical Engineering
  Operating Procedures and Materials Treatment
  Civil Engineering
  Building Materials
  
• 出版者：Springer Netherlands
• ISSN：1871-6873

文摘

This paper investigates the behavior of rectangular concrete columns confined with carbon fiber reinforced polymer (CFRP) composites, considering the effect of corner radius and cross section aspect ratio. Nonlinear behavior of confined concrete and orthotropic behavior of fiber-reinforced polymer (FRP) composite have been incorporated in the finite element modeling. The CFRP rupture was modeled in the state of biaxial stresses by using Tsai–Wu’s failure criterion. Therefore, the effects of axial stresses on rupture of FRP as well as the effects of hoop stresses were taken into consideration. Furthermore, to provide more precise modeling and analysis, Tsai–Wu’s criterion and a modified Drucker–Prager plasticity model were applied concurrently in simulating. The finite element analysis was verified by simulating CFRP confined cylindrical and rectangular columns. Concrete columns with cross section aspect ratios of 1.00, 1.25, 1.54 and 2.00, and different corner radii including 5, 15, 25 and 38?mm were modeled. Corner radii of 45, 60 and 75?mm were also modeled in square sections. Results showed that both decreasing the corner radius and increasing the aspect ratio, decrease the compressive strength and ductility enhancement of the confined column. Results of simulating rectangular confined columns led to a design-oriented model for predicting the compressive strength of these sections with different corner radii. The proposed simple model is shown to be in good agreement with the existing test results in the literature, showing the applicability of the model for design purposes for FRP-confined concrete columns.