Title:
Strengthening of a Bridge Using Post-Tensioned Near‑Surface-Mounted Carbon Fiber-Reinforced Polymer in Multi-Hazard Environment
Author(s):
Yail J. Kim, Jae-Yoon Kang, Jong-Sup Park, and Woo-Tai Jung
Publication:
Structural Journal
Volume:
115
Issue:
2
Appears on pages(s):
451-462
Keywords:
bridge; carbon fiber-reinforced polymer (CFRP); deterioration; multi-hazard; near-surface-mounted (NSM); post-tensioning; strengthening
DOI:
10.14359/51701118
Date:
3/1/2018
Abstract:
This paper presents an analytical investigation into the performance of a reinforced concrete bridge girder strengthened with post-tensioned near-surface-mounted (NSM) carbon fiberreinforced polymer (CFRP) strips in a corrosion-overload multihazard environment. Stochastic models are formulated to examine the service- and strength-level responses, functional requirements such as deformability and vulnerability, and time-dependent reliability of the strengthened girder. In conjunction with environmental data recorded for 30 years, four service zones specified in the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications are employed to generate practical research outcomes. Chloride-induced diffusion becomes more active in summer compared with other seasons. As such, stresses in the girders’ steel reinforcement increase with the progression of corrosion; however, the increase does not cause a fatigue concern. A marginal increase in CFRP stress is noticed, spanning a 100-year service period. The deformability of the strengthened girder is acceptable within a reduction range of up to 20%. The multi-hazard distress augments the vulnerability of the girder and, accordingly, affects the long-term reliability, which should be taken into consideration when implementing the NSM CFRP technology.
Related References:
1. Saetta, A. V.; Scotta, R. V.; and Vilaliani, R. V., “Analysis of Chloride Diffusion into Partially Saturated Concrete,” ACI Materials Journal, V. 90, No. 5, Sept.-Oct. 1993, pp. 441-451.
2. 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
3. El-Hacha, R., and Soudki, K., “Prestressed Near-Surface Mounted Fibre Reinforced Polymer Reinforcement for Concrete Structures—A Review,” Canadian Journal of Civil Engineering, V. 40, No. 11, 2013, pp. 1127-1139. doi: 10.1139/cjce-2013-0063
4. 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)
5. Peng, H.; Zhang, J.; Cai, C. S.; and Liu, Y., “An Experimental Study on Reinforced Concrete Beams Strengthened with Prestressed Near Surface Mounted CFRP Strips,” Engineering Structures, V. 79, 2014, pp. 22-233. doi: 10.1016/j.engstruct.2014.08.007
6. Lee, D., and Cheng, L., “Assessing the Strengthening Effect of Various Near-Surface-Mounted FRP Reinforcements on Concrete Bridge Slab Overhangs,” Journal of Composites for Construction, ASCE, V. 15, No. 4, 2011, pp. 615-624. doi: 10.1061/(ASCE)CC.1943-5614.0000182
7. Hajihashemi, A.; Mostofinejad, D.; and Azhari, M., “Investigation of RC Beams Strengthened with Prestressed NSM CFRP Laminates,” Journal of Composites for Construction, ASCE, V. 15, No. 6, 2011, pp. 887-895. doi: 10.1061/(ASCE)CC.1943-5614.0000225
8. Badawi, M., and Soudki, K., “Flexural Strengthening of RC Beams with Prestressed NSM CFRP Rods—Experimental and Analytical Investigation,” Construction and Building Materials, V. 23, No. 10, 2009, pp. 3292-3300. doi: 10.1016/j.conbuildmat.2009.03.005
9. AASHTO, “AASHTO LRFD Bridge Design Specifications (7th Edition with 2016 Interim Revisions),” American Association of State Highway and Transportation Officials, Washington, DC, 2016.
10. Hughes Brothers, Carbon fiber reinforced polymer (CFRP) tape, Hughes Brothers, Inc., Seward, NE, 2016.
11. 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.
12. Kim, Y. J.; Hyun, S. W.; Kang, J.-Y.; and Park, J.-S., “Anchorage Configuration for Post-Tensioned NSM CFRP Upgrading Constructed Bridge Girders,” Engineering Structures, V. 79, 2014, pp. 256-266. doi: 10.1016/j.engstruct.2014.08.022
13. Brunell, G., and Kim, Y. J., “Functionality of Damaged Steel Truss Systems Strengthened with Post-tensioned CFRP Tendon,” Journal of Composites for Construction, ASCE, V. 17, No. 3, 2013, pp. 383-394. doi: 10.1061/(ASCE)CC.1943-5614.0000362
14. Barker, R. M., and Puckett, J. A., Design of Highway Bridges Based on AASHTO LRFD Bridge Design Specifications, John Wiley & Sons, Inc., New York, 1997.
15. NOAA, Climate Monitoring, National Oceanic and Atmospheric Administration, Silver Spring, MD, 2012.
16. Thoft-Christensen, P.; Jensen, F. M.; Middleton, C. R.; and Blackmore, A., “Assessment of the Reliability of Concrete Slab Bridges,” 7th IFIP WG 7.5 Working Conference, Boulder, CO, 1996, pp. 1-8.
17. Ahmad, Z., Principles of Corrosion Engineering and Corrosion Control, Butterworth-Heinemann, Oxford, UK, 2006.
18. Vu, K. A. T., and Stewart, M. G., “Structural Reliability of Concrete Bridges Including Improved Chloride-Induced Corrosion Models,” Structural Safety, V. 22, No. 4, 2000, pp. 313-333. doi: 10.1016/S0167-4730(00)00018-7
19. TRB, “Bridges for Service Life Beyond 100 Years: Service Limit State Design (SHRP R19B),” Transportation Research Board, Washington, DC, 2015.
20. Zou, P. X. W., “Long-Term Properties and Transfer Length of Fiber-Reinforced Polymers,” Journal of Composites for Construction, ASCE, V. 7, No. 1, 2003, pp. 10-19. doi: 10.1061/(ASCE)1090-0268(2003)7:1(10)
21. ACI Committee 440, “Prestressing Concrete Structures with FRP Tendons (ACI 440.4R-04),” American Concrete Institute, Farmington Hills, MI, 2004, 35 pp.
22. Nowak, A. S., “Calibration of LRFD Bridge Design Code (NCHRP 368),” Transportation Research Board, Washington, DC, 1999.
23. Hoffman, P. C., and Weyers, R. E., “Predicting Critical Chloride Levels in Concrete Bridge Decks,” Proceedings of International Conference on Structural Safety and Reliability (ICOSSAR), 1994, pp. 957-959.
24. Dyer, T., Concrete Durability, CRC Press, Boca Raton, FL, 2014.
25. ACI Committee 215, “Considerations for Design of Concrete Structures Subjected to Fatigue Loading (ACI 215R-74) (Reapproved 1997),” American Concrete Institute, Farmington Hills, MI, 1997, 24 pp.