Title:
Behavior of Reinforced Concrete Panels Strengthened with Carbon Fiber-Reinforced Polymers
Author(s):
Changhyuk Kim, Wassim M. Ghannoum, and James O. Jirsa
Publication:
Structural Journal
Volume:
113
Issue:
5
Appears on pages(s):
1077-1084
Keywords:
bidirectional carbon fiber-reinforced polymer (CFRP) layout; bottle-shaped strut; CFRP anchor; CFRP strip; panel test
DOI:
10.14359/51689031
Date:
9/1/2016
Abstract:
Many bridges are handling heavier loads than those expected at design and require strengthening of existing members or repairing damaged members. Carbon fiber-reinforced polymer (CFRP) materials have been used successfully to strengthen reinforced concrete structures. Most studies have focused on unidirectional layout of CFRP strips in high shear regions of beams. Recent shear tests on full-scale I-girders have shown that the use of bidirectional CFRP layouts with CFRP anchors led to much higher shear strength increases than when using unidirectional layouts. Small-scale panel tests have been conducted to investigate parameters that influence the performance of bidirectional CFRP layouts. Panels were tested under compressive forces that resemble compression struts that develop in the webs of I-beams. The panels were tested to investigate a number of parameters in a more efficient manner than testing full-scale girders. The panel tests provide qualitative comparisons between the influences of the parameters.
Related References:
1. Kim, I.; Jirsa, J. O.; and Bayrak, O., “Anchorage of Carbon Fiber-Reinforced Polymer on Side Faces of Reinforced Concrete Beams to Provide Continuity,” ACI Structural Journal, V. 110, No. 6, Nov.-Dec. 2013, pp. 1089-1098.
2. Kim, Y.; Quinn, K.; Ghannoum, W. M.; and Jirsa, J. O., “Strengthening of Reinforced Concrete T-Beams Using Anchored CFRP Materials,” ACI Structural Journal, V. 111, No. 5, Sept.-Oct. 2014, pp. 1027-1036. doi: 10.14359/51686805
3. Kim, Y.; Quinn, K.; Satrom, C. N.; Garcia, J.; Sun, W.; Ghannoum, W. M.; and Jirsa, J. O., “Shear Strengthening of Reinforced and Prestressed Concrete Beams Using Carbon Fiber Reinforced Polymer (CFRP) Sheets and Anchors,” Report 0-6306-1, Center for Transportation Research at The University of Texas at Austin, Austin, TX, 2012, pp. 226-229.
4. AASHTO, “AASHTO LRFD Bridge Design Specifications,” seventh edition, Washington, DC, 2014.
5. Kobayashi, K.; Fujii, S.; Yabe, Y.; Tsukagoshi, H.; and Sugiyama, T., “Advanced Wrapping System with CF Anchor-Stress Transfer Mechanism of CF Anchor,” Proceedings of the 5th International Symposium on Fiber-Reinforced Polymer (FRP) Reinforcement for Concrete Structures, (FRPRCS-5), Cambridge, U.K., 2001, pp. 379-388.
6. Sokoli, D.; Shekarchi, W.; Buenrostro, E.; and Ghannoum, W. M., “Advancing Behavioral Understanding and Damage Evaluation of Concrete Members Using High-Resolution Digital Image Correlation Data,” Earthquakes and Structures, V. 7, No. 5, 2014, pp. 609-626. doi: 10.12989/eas.2014.7.5.609
7. Kim, Y., “Shear Behavior of Reinforced Concrete T-beams Strengthened with Carbon Fiber Reinforced Polymer (CFRP) Sheets and CFRP Anchors,” PhD dissertation, Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, Austin, TX, 2011.
8. Kim, C., “Performance of Concrete Panels Strengthened Using Carbon Fiber Reinforced Polymers (CFRP),” PhD dissertation, Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, Austin, TX, 2014.