Study on Shear Behaviour of Concrete Beams Prestressed with External CFRP Tendons

Abstract:

Based on independent research and development of a CFRP tendons wedge-type anchorage, the shear tests of six CFRP external prestressing concrete beams were done. Among them, CFRP external tendons of three pieces were installed in straight line while other pieces were installed in curved line. The results of experimental research show that shear behaviour of concrete beams prestressed with CFRP external tendons are the similar process to the traditional prestressed reinforced concrete beams. They go through the elastic stage, the stage of crack extension, the yield stage of internal hoop reinforcements at the intersection of inclined cracks and the failure stage. When external CFRP tendons are arranged in the same situation, the cracking load and the shear capacity of concrete beams prestressed with CFRP external tendons reduce gradually along with the increase of shear-span ratio,.When shear-span ratio is equal, the cracking load and the shear capacity of concrete beams prestressed with curved arrangement of CFRP external tendons are larger than those of concrete beams prestressed with straight arrangement of CFRP external tendons. Compared with traditional concrete beams prestressed with external steel bars, due to elasticity modulus and shear modulus of CFRP tendons are both smaller than those of steel bars, the mid-span deflection of concrete beams prestressed with CFRP external tendons at the time of shear failure is bigger than that of traditional concrete beams prestressed with external steel bars under the same circumstance.

• Periodical: Applied Mechanics and Materials (Volumes 275-277)
• Pages: 1167-1171
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.275-277.1167
• Online since: January 2013
• Authors: Xin Ding Wang, Hang Dai, Yong Chao Zhang
• Keywords: CFRP Tendon, External Prestressing, Shear Capacity, Shear Test

References

[1] Arvid Hejll, Bjorn Taljsten, Masoud Motavalli. Large scale hybrid FRP composite girders for use in bridge structures—theory, test and field application [J]. Composites (Part B: Eng. ), 2005, 36(8): 573–585.

DOI: 10.1016/j.compositesb.2005.05.002

[2] Nabil F. Grace. Design-construction of bridge street bridge—First CFRP bridge in the United States [J]. PCJ Journal, 2002(Sept. -Oct. ): 20-35.

DOI: 10.15554/pcij.09012002.20.35

[3] Taketo Uomoto. Use of fiber reinforced polymer composites as reinforcing material for concrete [J]. Journal of material in civil engineering, 2002, 14(3): 191-209.

DOI: 10.1061/(asce)0899-1561(2002)14:3(191)

[4] Sebastian Swiatecki. Building better bridges with CFRP[J]. Reinforced Plastics, 1998, 12(3): 44-46.

[5] Lelli Van Den Einde, Lei Zhao, Frieder Seible. Use of FRP composites in civil structural applications[J]. Construction and Building Materials, 2003, 17(6-7): 389-403.

DOI: 10.1016/s0950-0618(03)00040-0

[6] Demers C E. Fatigue strength degradation of E-glass FRP composites and carbon FRP composites [J] . Construction and Building Materials, 1998, 12 (5): 311- 318.

DOI: 10.1016/s0950-0618(98)00012-9

[7] Abdelrahman A A , Tadros G, Rizkalla S H. Test model for the first canadian smart highway bridge [J ] . ACI Materials Journal, 1995, 92(4): 451-458.

[8] Patrick X. W. Zou. Flexural behavior and deformability of fiber reinforced polymer prestressed concrete beams [J]. Journal of Composites for Construction, 2003, 7 (4): 275-284.

DOI: 10.1061/(asce)1090-0268(2003)7:4(275)