Size effect on bond properties of interface between FRP sheets and concrete

被引：0
作者：
Dept. of Urban and Civil Eng., Ibaraki Univ., Nakanarusawa-cho, Hitachi, 316-8511, Japan [1 ]
机构：
[1] Dept. of Urban and Civil Eng., Ibaraki Univ., Hitachi, 316-8511, Nakanarusawa-cho
来源：
Zairyo | 2008年 / 3卷 / 269-276期
关键词：
Effective transfer length; Epoxy resin and primer; Fiber reinforced polymer sheets; Interfacial fracture energy; Size effect; U-shape FRP anchorage;
D O I：
10.2472/jsms.57.269
中图分类号：
学科分类号：
摘要：
Bond plays a critical role in strengthening and upgrading of concrete structures using FRP bonding technology. Since the interfacial surface may be heterogeneous and bond failure is typically brittle, the size effect can be significant, making the bond parameters obtained with small specimens unsuitable to full-scale applications. This paper is to examine the size effect on the bond properties in concrete structures strengthened externally with bonded FRP sheets. A unique apparatus was developed for large-sized specimens with 350mm width. As suggested by Lu et.al., increasing a ratio between FRP sheets width (bf) and concrete width (bc) decreased Gf values. However, it was found that a function of stiffness of interface between FRP sheets and concrete could be larger than that suggested by Lu et.al. as a result of experiments. Moreover, effective transfer length of FRP sheets is not affected by the size effect. Gf of specimens anchored with U-shape FRP sheets are no larger than that of no-anchored specimens, but the ductility in the final debonding becomes larger. © 2008 The Society of Materials Science.
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页码：269 / 276
页数：7
相关论文
共 11 条
  • [1] Recommendations for upgrading of concrete structures with use of continuous fiber sheets, concrete library, 101, (2000)
  • [2] Nishida H., Kamiharako A., Shimomura T., Maruyama K., Bond mechanism between continuous fiber and concrete, Proceedings of the Japan Concrete Institute, 21, 3, pp. 1507-1512, (1999)
  • [3] Sato Y., Asano Y., Ueda T., Fundamental study on bond mechanism of carbon fiber sheet, Journal of Materials, Concrete Structures and Pavements, Japan Society of Civil Engineers, V-47, 648, pp. 71-87, (2000)
  • [4] Izumo K., Saeki N., Ohnuma H., Estimating bond strength between fiber sheets and concrete, Journal of Materials, Concrete Structures and Pavements, Japan Society of Civil Engineers, V-46, 641, pp. 167-178, (2000)
  • [5] Yoshizawa H., Wu Z.S., Yuan H., Kanakubo T., Study on FRP-concrete interface bond performance, Journal of Materials, Concrete Structures and Pavements, Japan Society of Civil Engineers, V-47, 648, pp. 71-87, (2000)
  • [6] Sato M., Ueda M., Hasebe N., Kondo H., Study on size effect of concrete-direct tensile strength, Proceedings of the Japan Concrete Institute, 15, 1, (1993)
  • [7] Wu Z.S., Kurokawa T., Strengthening effective anchorage method for flexure members with externally bonded CFRP plates, Journal of Materials, Concrete Structures and Pavement, Japan Society of Civil Engineers, V-56, 711, pp. 1-13, (2002)
  • [8] Lu X.Z., Teng J.G., Ye L.P., Jiang J.J., Bond slip models for FRP sheets/plates bonded to concrete, Engineering Structures, 27, 6, pp. 938-950, (2005)
  • [9] Wu Z.S., Yuan H., Yoshizawa H., Kanakubo T., Experimental/ analytical study on interface fracture energy and fracture propagation along FRP-concrete interface, Fracture Mechanics for Concrete Materials : Testing and Applications, ACI International, SP-201-8, pp. 133-152, (2001)
  • [10] Committee report of study for reinforced concrete with continuous fibers (II), pp. 7-13, (1998)
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