Experimental study on shear performance of T-shaped RC beams strengthened with U-shaped prestressed steel jackets

被引：0
|
作者：
Liu Y. [1 ,2 ]
Chen H. [1 ]
Guo Z. [1 ,2 ]
Chen D. [1 ]
Huang Q. [1 ,2 ]
机构：
[1] College of Civil Engineering, Huaqiao University, Xiamen
[2] Key Laboratory for Structural Engineering and Disaster Prevention of Fujian Province, Huaqiao University, Xiamen
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2019年 / 40卷 / 09期
关键词：
Prestressed steel jacket; Reinforced concrete beam; Shear capacity; Static test; Strengthening;
D O I：
10.14006/j.jzjgxb.2018.0043
中图分类号：
学科分类号：
摘要：
To improve the shear strengthening technology of existing T-shaped reinforced concrete (RC) beams, a retrofitting technique using U-shaped prestressed steel jackets(PSJ) to enhance the shear performance of T-shaped RC beams was proposed. One full scale RC beam and five full scale strengthened RC beams were tested using simply supported beam method under monolithic loading. The influences of spacing(sJ) and prestressing level(α) of PSJs on the shear performance of the T-shaped RC beams were studied. The damage development, failure modes, load versus deflection curves of the specimens and strain development curves of PSJ, reinforcement and concrete were obtained from the test. It is indicated that the shear strength of T-shaped RC beams can be effectively enhanced after retrofitting by U-shaped PSJs. The shear strength of specimens increases with the decrease of the PSJ spacing and the maximum increment of shear strength of specimens is 46.1%. But when the PSJ spacing is less than 400mm, the enhancing effect due to the use of PSJ on the shear strength of specimens decreases gradually. The stressing level of PSJs has no obvious effect on the shear strength of specimens when it's higher than 0.35. The calculation method of the shear strength of retrofitting T-shaped RC beams was proposed. The test results of the shear strength of specimens agreed well with the calculation ones and therefore can be referenced for the retrofit design of existing T-shaped RC beams. © 2019, Editorial Office of Journal of Building Structures. All right reserved.
引用
收藏
页码：113 / 121
页数：8
相关论文
共 15 条
  • [1] Nie J., Cai Q., Zhang T., Et al., Experimental study on shear behavior of RC beams strengthened with stainless steel wire mesh and permeability polymer mortar, Journal of Building Structures, 26, 4, pp. 10-17, (2005)
  • [2] Huang H., Liu B., He S., Et al., Calculation of shear debonding capacity of RC beams strengthened with high strength steel wire mesh, China Journal of Highway and Transport, 26, 2, pp. 102-118, (2013)
  • [3] Zong Z., Cheng Y., Huang X., Et al., Experimental study on shear properties of reinforced concrete(RC) and partial prestressed concrete(PPC) beams strengthened with externally bonded CFRP strips, Engineering Mechanics, 30, 6, pp. 236-246, (2013)
  • [4] Mofidi A., Thivierge S., Chaallal O., Et al., Behavior of reinforced concrete beams strengthened in shear using L-shaped CFRP plates: experimental investigation, Journal of Composites for Construction, 18, 2, pp. 161-179, (2014)
  • [5] Altin S., Anil O., Kara M.E., Improving shear capacity of exsting RC beams using external bonding of steel plates, Engineering Structures, 27, 5, pp. 781-791, (2005)
  • [6] Lin Y., Zong Z., Chen H., Experimental study on shear performance of concrete beams strengthened with steel plates, Journal of Building Structures, 32, 8, pp. 90-98, (2011)
  • [7] Bruckner A., Ortlepp R., Curbach M., Anchoring of shear strengthening for T-beams made of textile reinforced concrete(TRC), Materials and Structures, 41, 2, pp. 407-418, (2008)
  • [8] Xun Y., Yin H., Xiao B., Experimental study on shear capacity of RC beams strengthened with textile reinforced concrete, China Civil Engineering Journal, 45, 5, pp. 58-64, (2012)
  • [9] Guo Z., Yang J., Ye Y., Et al., Experimental research on shear strengthening of reinforced concrete beams using prestressed wire-rope hoops, Journal of Central South University (Science and Technology), 46, 7, pp. 2590-2596, (2015)
  • [10] Huang Q., Guo Z., Cui J., Et al., Experimental study on seismic behavior of RC frame joints strengthened with prestressed steel wire rope, China Civil Engineering Journal, 48, 6, pp. 1-8, (2015)
12