On the FE Modeling of FRP-Retrofitted Beam–Column Subassemblies

다국어 초록 (Multilingual Abstract)

The use of fiber reinforced polymer (FRP) composites in strengthening reinforced concrete beam?column subassemblies has been scrutinised both experimentally and numerically in recent years. While a multitude of numerical models are available, and many match the experimental results reasonably well, there are not many studies that have looked at the efficiency of different finite elements in a comparative way in order to clearly identify the best practice when it comes to modelling FRP for strengthening. The present study aims at investigating this within the context of FRP retrofitted reinforced concrete beam?column subassemblies. Two programs are used side by side; ANSYS and VecTor2. Results of the finite element modeling using these two programs are compared with a recent experimental study. Different failure and yield criteria along with different element types are implemented and a useful technique, which can reduce the number of elements considerably, is successfully employed for modeling planar structures subjected to in-plane loading in ANSYS. Comparison of the results shows that there is good agreement between ANSYS and VecTor2 results in monotonic loading. However, unlike VecTor2 program, implicit version of ANSYS program is not able to properly model the cyclic behavior of the modeled subassemblies. The paper will be useful to those who wish to study FRP strengthening applications numerically as it provides an insight into the choice of the elements and the methods of modeling to achieve desired accuracy and numerical stability, a matter not so clearly explored in the past in any of the published literature.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Test Data
• 3. ANSYS Analytical Procedure
• 4. VecTor2 Analytical Procedure
• 5. Comparison of the Results
• 6. Conclusion
• References

참고문헌 (Reference)

1 Mahini, S. S, "Web-bonded FRPs for relocation of plastic hinges away from the column face in exteriorRCjoints" 93 (93): 2460-2472, 2011

2 Wong, P, "VecTor2 and FormWorks user’s manual" University of Toronto 2002

3 Wong, R. S. Y, "Towards modeling of reinforced concrete members with externally bonded fiberreinforced polymer composites" 100 (100): 47-55, 2003

4 Vecchio, F. J, "The modified compression-field theory for reinforced concrete elements subjected to shear" 83 (83): 219-231, 1986

5 Shahawy, M, "Tests and modeling of carbon-wrapped concrete columns" 31 (31): 471-480, 2000

6 Hunley, C. T, "Structural redundancy evaluation of steel tub girder bridges" 17 (17): 481-489, 2012

7 Karayannis, C. G, "Strengthening and rehabilitation of RC beam–column joints using carbon-FRP jacketing and epoxy resin injection" 37 (37): 769-790, 2008

8 Pantelides, C. P, "Seismic rehabilitation of reinforced concrete frame interior beam– column joints with FRP composites" 12 (12): 435-445, 2008

9 Ghobarah, A, "Seismic rehabilitation of deficient exterior concrete frame joints" 9 (9): 408-416, 2005

10 El-Amoury, T. A, "Seismic rehabilitation of concrete frame beam–column joints" McMaster University 2004

11 Kra´lik, J, "Seismic analysis of reinforced concrete frame–wall systems considering ductility effects in accordance to Eurocode" 31 (31): 2865-2872, 2009

12 Mahini, S. S, "Rehabilitation of exterior RC beam–column joints using web-bonded FRP sheets" The University of Queensland 2005

13 Bohl, A, "Plastic hinge lengths in high-rise concrete shear walls" 108 (108): 148-157, 2011

14 Seyed S. Mahini, "Numerical modelling of FRP strengthened RC beam-column joints" 국제구조공학회 32 (32): 649-665, 2009

15 Alhaddad, M. S, "Numerical investigations on the seismic behavior of FRP and TRM Upgraded RC exterior beam–column joints" 16 (16): 308-321, 2012

16 Biscaia, H. C, "Nonlinear numerical analysis of the debonding failure process of FRP-to-concrete interfaces" 50 : 210-223, 2013

17 Mirmiran, A, "Nonlinear finite element modeling of concrete confined by fiber composites" 35 (35): 79-96, 2000

18 Sagbas, G, "Nonlinear finite element analysis of beam–column subassemblies" University of Toronto 2007

19 Kim, S. -W, "Modeling of shear–critical reinforced concrete structures repaired with fiber-reinforced polymer composites" 134 (134): 1288-1299, 2008

20 Parvin, A, "Investigation on the effects of fiber composites at concrete joints" 31 (31): 499-509, 2000

21 Seckin, M, "Hysteretic behaviour of cast-in-place exterior beam–column-slab subassemblies" University of Toronto 1981

22 Hawileh, R. A, "Finite element simulation of reinforced concrete beams externally strengthened with short-length CFRP plates" 45 (45): 1722-1730, 2012

23 Rijun Shrestha, "Finite element modelling of FRP-strengthened RC beam-column connections with ANSYS" 국제구조공학회 11 (11): 1-20, 2013

24 Kachlakev, D, "Finite element modeling of reinforced concrete structures strengthened with FRP laminates" 316 : 2001-, 2001

25 Richart, F. E, "Failure of plain and spirally reinforced concrete in compression" Illinois State University 1929

26 Drucker, D, "Extended limit design theorems for continuous media" 9 (9): 381-389, 1952

27 Ko, M. -Y, "Experimental study on the plastic rotation capacity of reinforced high strength concrete beams" 34 (34): 302-311, 2001

28 Vecchio, F, "Experimental and analytical reexamination of classic concrete beam tests" 130 (130): 460-469, 2004

29 Vecchio, F, "Disturbed stress field model for reinforced concrete : Formulation" 126 (126): 1070-1077, 2000

30 William, K. J, "Constitutive model for the triaxial behaviour of concrete. In Proceedings of the International Assoc. for Bridge and Structural Engineering" ISMES Press 1974

31 Sagbas, G, "Computational modeling of the seismic performance of beam– column subassemblies" 15 (15): 640-663, 2011

32 Palermo, D, "Compression field modeling of reinforced concrete subjected to reversed loading : formulation" 100 (100): 616-625, 2003

33 Vecchio, F, "Analysis of repaired reinforced concrete structures" 125 (125): 644-652, 1999

34 "ANSYS Manual" ANSYS Inc 2012

35 Rochette, P, "A plasticity approach for concrete columns confined with composite materials" 1996