Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (4): 590-595.DOI: 10.12068/j.issn.1005-3026.2019.04.026

• Resources & Civil Engineering • Previous Articles     Next Articles

Flexural Performance of Damaged Prestressed Reinforced Concrete Beams Strengthened with Near Surface Mounted CFRP Strips

YANG Jia1,2, WANG Lian-guang1, HOU Wen-yu1   

  1. 1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China; 2. College of Architectural Engineering, Shenyang University, Shenyang 110044, China.
  • Received:2018-02-27 Revised:2018-02-27 Online:2019-04-15 Published:2019-04-26
  • Contact: WANG Lian-guang
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Abstract: In order to investigate the flexural performance of damaged prestressed reinforced concrete(PRC) beams strengthened with near surface mounted(NSM) carbon fiber reinforced polymer(CFRP) strips under overloading, bending tests of six PRC beams were carried out. The failure mode, bearing capacity and stiffness of PRC beams strengthened with NSM CFRP strips were studied. The influences of the number of overloading cycles, overloading amplitude and sustaining load on the performance of strengthened beams were also evaluated. The experimental results indicated that compared with un-strengthened beam, the flexural capacity and stiffness of the strengthened beams can be enhanced obviously. The ultimate loads are increased by 7% to 15%. There are little influences on ultimate bearing capacity of the strengthened beams caused by the cycle number, the overload amplitude and the sustaining load, while the overload amplitude and the sustaining load affect the stiffness of the strengthened beams. A calculation formula of bearing capacity is established, and the theoretical values agree well with the experimental values.

Key words: prestressed reinforced concrete beams, flexural performance, experimental research, carbon fiber reinforced polymer, damage, sustaining load

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