Use of high strength, high ductility engineered cementitious composites (ECC) to enhance the flexural performance of reinforced concrete beams

被引:105
作者
Qin, Fengjiang [1 ]
Zhang, Zhigang [1 ]
Yin, Zhiwei [1 ]
Di, Jin [1 ]
Xu, Liangjin [1 ]
Xu, Xiaoqing [1 ]
机构
[1] Chongqing Univ, Sch Civil Engn, Key Lab New Technol Construct Cities Mt Area, Minist Educ, Chongqing 400045, Peoples R China
基金
中国国家自然科学基金;
关键词
ECC; High strength; High ductility; Strengthened concrete beam; Flexural performance; MECHANICAL-PROPERTIES; MATRIX DESIGN; RC BEAMS; BEHAVIOR; TOUGHNESS; CAPACITY; MEMBERS; REPAIR;
D O I
10.1016/j.jobe.2020.101746
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper investigated the flexural performance of reinforced concrete beams strengthened with high strength, high ductility engineered cementitious composites (HSHD-ECC). A total of seven reinforced concrete (RC) beams, including one control and six strengthened, were prepared and tested. The test variables included thickness of ECC layer and longitudinal reinforcement ratio. The test results showed that HSHD-ECC can be an ideal construction material for improving the flexural performance of reinforced concrete beams. For the failure mode, localized cracking was not observed in the beams with ECC layer even when the ultimate loading was reached, instead of that, multiple micro-cracks appeared in tensile zone of beams due to the high ductility of ECC. In term of flexural performance, the use of ECC layer to strengthen reinforced concrete beams can not only improve the cracking load, yield load and ultimate load of RC beams, but also improve the ductility and energy absorption capability. Moreover, the ECC layer shows superior synergistic performance with steel bars in tension zone and normal concrete in compression zone of RC beams, and as a result, they have enhanced load-bearing capacity. Based on the equilibrium condition between axial force and bending moment, a simplified method for predicting the flexural capacity is derived. The average ratio of the predicted flexural capacity to the experimental ones of the strengthened RC beams was 0.94 with a coefficient of variation of 0.03.
引用
收藏
页数:14
相关论文
共 45 条
  • [1] [Anonymous], 2008, Recommendations for Design and Construction of High Performance Fiber Reinforced Cement Composites with Multiple Fine Cracks, P1
  • [2] [Anonymous], 2010, 500102010 GB MIN HOU
  • [3] ASTM C109, 2014, C109 ASTM
  • [4] Structural behaviors of ultra-high performance engineered cementitious composites (UHP-ECC) beams subjected to bending-experimental study
    Ding, Yao
    Yu, Ke-Quan
    Yu, Jiang-tao
    Xu, Shi-lang
    [J]. CONSTRUCTION AND BUILDING MATERIALS, 2018, 177 : 102 - 115
  • [5] Fischer G, 2003, ACI STRUCT J, V100, P166
  • [6] Fischer G, 2003, ACI STRUCT J, V100, P25
  • [7] Flexural behavior of ECC-concrete composite beams reinforced with steel bars
    Ge, Wen-Jie
    Ashour, Ashraf F.
    Ji, Xiang
    Cai, Chen
    Cao, Da-Fu
    [J]. CONSTRUCTION AND BUILDING MATERIALS, 2018, 159 : 175 - 188
  • [8] Experimental study on flexural behavior of ECC-concrete composite beams reinforced with FRP bars
    Ge, Wenjie
    Ashour, Ashraf F.
    Cao, Dafu
    Lu, Weigang
    Gao, Peiqi
    Yu, Jiamin
    Ji, Xiang
    Cai, Chen
    [J]. COMPOSITE STRUCTURES, 2019, 208 : 454 - 465
  • [9] Flexural behaviors of hybrid concrete beams reinforced with BFRP bars and steel bars
    Ge, Wenjie
    Zhang, Jiwen
    Cao, Dafu
    Tu, Yongming
    [J]. CONSTRUCTION AND BUILDING MATERIALS, 2015, 87 : 28 - 37
  • [10] Gopalaratnam V.S., 1995, CEMENT CONCRETE COMP, V17, P239, DOI [DOI 10.1016/0958-9465(95)99506-O, DOI 10.1016/0958-9465(95)99506-0]