Title:
Thermomechanical Behavior of Near-Surface-Mounted Carbon Fiber-Reinforced Polymer Concrete Interface
Author(s):
Thushara Siriwardanage and Yail J. Kim
Publication:
Structural Journal
Volume:
113
Issue:
3
Appears on pages(s):
567-576
Keywords:
carbon fiber-reinforced polymer (CFRP); heat; interface; nearsurface- mounted (NSM); temperature; thermal
DOI:
10.14359/51687944
Date:
5/1/2016
Abstract:
This paper presents the behavior of near-surface-mounted (NSM) carbon fiber-reinforced polymer (CFRP) strips for strengthening concrete members subjected to thermomechanical distress (thermal and mechanical loads are applied simultaneously). The focus of the research lies on examining temperature-dependent interfacial responses that control the performance of such a CFRP-strengthening system. An experimental investigation is conducted to study various technical aspects associated with the thermal relaxation, heat conduction, load-carrying capacity, failure mode, and damage characterization of the NSM CFRP concrete interface. Analytical approaches are entailed to generate practical information that can promote use of CFRP-strengthening technologies, based on the two-parameter Weibull function along with probability-based capacity simulation. The thermal relaxation of a polymeric bonding agent influences the transfer of interfacial stresses, including the stress-decrease response time of the interface with temperature. Transient heat flow is apparent across the interface until the strengthening system fails due to the thermomechanical load. The failure plane of the interface is controlled by the progression of heat energy in conjunction with the phase transition of the adhesive. The slip of the interface articulates a thermal hysteresis mechanism when loaded cyclically. The characteristic parameters proposed aid the design of NSM CFRP systems exposed to elevated temperatures.
Related References:
1. Karbhari, V. M., and Seible, F., “Fiber Reinforced Composites—
Advanced Materials for the Renewal of Civil Infrastructure,” Applied Composite Materials, V. 7, No. 2-3, 2000, pp. 95-124. doi: 10.1023/A:1008915706226
2. Bank, L., Composites for Construction: Structural Design with FRP Materials, John Wiley & Sons, Inc., Hoboken, NJ, 2006.
3. Seracino, R.; Jones, N. M.; Ali, M. S. M.; Page, M. W.; and Oehlers, D. J., “Bond Strength of Near-Surface Mounted FRP Strip-to-Concrete Joints,” Journal of Composites for Construction, ASCE, V. 11, No. 4, 2007, pp. 401-409. doi: 10.1061/(ASCE)1090-0268(2007)11:4(401)
4. Kodur, V., and Yu, B., “Evaluating the Fire Response of Concrete Beams Strengthened with Near-Surface-Mounted FRP Reinforcement,” Journal of Composites for Construction, ASCE, V. 17, No. 4, 2013, pp. 517-529. doi: 10.1061/(ASCE)CC.1943-5614.0000348
5. Porter, M. X., and Harries, K., “Future Directions for Research in FRP Composites in Concrete Construction,” Journal of Composites for Construction, ASCE, V. 11, No. 3, 2007, pp. 252-257. doi: 10.1061/(ASCE)1090-0268(2007)11:3(252)
6. Bisby, L., and Stratford, T., “Design for Fire of Concrete Elements Strengthened or Reinforced with Fibre-Reinforced Polymer: State of the Art and Opportunities from Performance-Based Approaches,” Canadian Journal of Civil Engineering, V. 40, No. 11, 2013, pp. 1-10. doi: 10.1139/cjce-2012-0506
7. Bisby, L. A.; Green, M. F.; and Kodur, V. K. R., “Response to Fire of Concrete Structures that Incorporate FRP,” Progress in Structural Engineering and Materials, V. 7, No. 3, 2005, pp. 136-149. doi: 10.1002/pse.198
8. Palmieri, A.; Matthys, S.; and Taerwe, L., “Fire Endurance and Residual Strength of Insulated Concrete Beams Strengthened with Near-Surface Mounted Reinforcement,” Journal of Composites for Construction, ASCE, V. 17, No. 4, 2013, pp. 454-462. doi: 10.1061/(ASCE)CC.1943-5614.0000338
9. Firmo, J. P.; Correia, J. R.; Pitta, D.; Tiago, C.; and Arruda, M. R. T., “Bond Behavior between Near-Surface-Mounted CFRP Strip and Concrete at High Temperatures,” Journal of Composites for Construction, ASCE, V. 19, No. 4, 2014, 04014071
10. De Lorenzis, L., and Teng, J. G., “Near-Surface Mounted FRP Reinforcement: An Emerging Technique for Strengthening Structures,” Composites. Part B, Engineering, V. 38, No. 2, 2007, pp. 119-143. doi: 10.1016/j.compositesb.2006.08.003
11. Kodur, V. K. R.; Bisby, L. A.; and Green, M. F., “Guidance for the Design of FRP-Strengthened Concrete Members Exposed to Fire,” Journal of Fire Protection Engineering, V. 17, No. 1, 2007, pp. 5-26. doi: 10.1177/1042391507061956
12. Chowdhury, E. U.; Bisby, L. A.; Green, M. F.; and Kodur, V. K. R., “Residual Behavior of Fire-Exposed Reinforced Concrete Beams Prestrengthened in Flexure with Fiber-Reinforced Polymer Sheets,” Journal of Composites for Construction, ASCE, V. 12, No. 1, 2008, pp. 61-68. doi: 10.1061/(ASCE)1090-0268(2008)12:1(61)
13. ACI Committee 440, “Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures (ACI 440.2R-08),” American Concrete Institute, Farmington Hills, MI, 2008, 76 pp.
14. ASTM C39/C39M-14, “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens,” ASTM International, West Conshohocken, PA, 2014, 7 pp.
15. Rostasy, F., “Fiber Composite Elements and Techniques as Non-Metallic Reinforcement of Concrete,” Brite Project 4142/BREU-CT910515, Evaluation of Potential and Production Technologies of FRP, Technical Report Task 1, 1992.
16. Mallick, P. K., Fiber-Reinforced Composites: Materials, Manufacturing, and Design, CRC Press, Boca Raton, FL, 2008.
17. Weibull, W., “A Statistical Theory of the Strength of Materials,” Proceedings of Royal Swedish Institute of Engineering Research, V. 151, 1939, pp. 1-45.