Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (4): 1153-1161.doi: 10.13229/j.cnki.jdxbgxb20180174

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Theoretical on flexural behavior of ultra high strength rebar reinforced engineered cementitious composites beam

Bi⁃xiong LI1,2(),Qiao LIAO1,2,Yi⁃ping ZHANG3,4,Lian ZHOU3,4,Ping WEI3,4,Kan LIU1,2   

  1. 1. College of Architecture and Environment, Sichuan University, Chengdu 610065, China
    2. Key Laboratory of Deep Underground Science and Engineering for Ministry of Education, Sichuan University, Chengdu 610065, China
    3. Sichuan Provincial Architectural Design and Research Institute, Chengdu 610072, China
    4. Sichuan Engineering and Technology Research Center of Architecture Industrialization, Chengdu 610072, China
  • Received:2018-02-28 Online:2019-07-01 Published:2019-07-16

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Abstract:

A new type of reinforced Engineered Cementitious Composites (ECC) beam was proposed with ultra high strength bars, named ultra high strength rebar reinforced ECC beam (UHSRRE). The tensile bearing capacity of ultra high strength reinforcement was expected to be efficiently utilized until the requirements of serviceability limit state were not met in UHSRRE. Theoretical analysis on the flexural behavior of UHSRRE was conducted. Three kinds of moments at different phases, including cracking moment, yielding moment and ultimate moment, were estimated with three fundamental hypotheses to calculate the flexural capacity. These hypotheses were the constitutive relationships of ECC and ultra high strength rebar, plane section assumption of mean strain, and the tensile stress of ECC in the tensile area of beam. In addition, the requirements of boundary and minimum reinforcement ratio were defined. These theoretical models were verified by the experimental results .

Key words: engineering mechanics, engineered cementitious composites（ECC）, ultra high strength rebar, calculation theory, bearing capacity of cross section, flexural member

CLC Number: 

  • TU375.1

Fig.1

Stress?strain theory curve of ECC under uniaxial tension"

Fig.2

Stress?strain theory curve of ECC under uniaxial compression"

Fig.3

Stress?strain theory curve of ultra high strength rebar"

Fig.4

Distribution of stress and strain for cross section at the end of phase I"

Fig.5

Distribution of stress and strain for cross section at the end of phase II when compression area was in elastic stage"

Fig.6

Distribution of stress and strain for cross section at the end of phase II when compression area was in elastoplastic stage"

Fig.7

Distribution of stress and strain for cross section at the end of phase Ⅲ"

Table 1

Theoretical and experimental values of UHSRRE subjected to flexure"

编号 开裂弯矩/（kN·m） M c r c M c r e 屈服弯矩/（kN·m） M y c M y e 极限弯矩/（kN·m） M u c M u e
M c r c M c r e M y c M y e M u c M u e
HRECC1 1.80 1.01 1.78 6.58 5.85 1.12 6.81 7.66 0.89
HRECC2 2.08 1.31 1.59 8.59 8.00 1.07 8.83 10.87 0.81
HRECC3 1.89 1.54 1.23 8.82 8.73 1.01 9.19 11.03 0.83

Fig.8

Comparison between theoretical and experimental values"

Table 2

Results of theoretical analysis"

编号

最小配筋率

/%

实际配筋率

/%

x c b

/mm

界限配筋率

/%

 受压区ECC应力（应变）状态

破坏

类型
第Ⅱ阶段末 第Ⅲ阶段末
HREEC1

0

0

0

 0.56

85.02

85.02

3.88

3.88

 弹性

压区边缘ECC

达单轴受压峰

值应变

延性破坏

延性破坏

延性破坏
HRECC2 0.84 弹塑性
HRECC3 1.12 73.52 3.79 弹塑性
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