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Effect of loading rate on the bond behaviour of deformed steel bars in concrete subjected to lateral pressure

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Abstract

The bond behaviour of steel bars is greatly influenced by the lateral stresses in surrounding concrete and the loading rate. However, information on the dynamic bond behavior of steel bars in concrete still remains limited. In this paper, a total of 180 pull-out specimens with different strengths of concrete and bar diameters are tested to investigate the effect of the loading rate on the bond behaviour of deformed steel bars in concrete subjected to lateral pressure. Based on the experimental results, the effects of various factors on the ultimate bond strength, the residual bond strength, and the slip at the peak bond stress are evaluated in a quantitative manner. Finally, a bond stress-slip relationship of deformed steel bars considering the loading rate, lateral pressure, the strength of concrete, and the bar diameter is proposed and verified with experimental results.

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Abbreviations

\(a,b,e,f,g,q,m,n\) :

Coefficients

c :

Cover depth

C r :

Rib spacing

d :

Core diameter of deformed steel bar

D :

Nominal diameter of deformed steel bar

E c :

Elastic modulus of concrete

E s :

Elastic modulus of steel bar

f cu :

Compressive strength of concrete

f y :

Yield strength of deformed steel bar

h :

Average rib depth

k r :

Ratio of residual to ultimate bond strength

l b :

Embedment or bond length

P :

Pull-out load

p 1, p 2 :

Lateral pressures

s :

Average slip of steel bar

s 0 :

Slip at peak bond stress

s 1, s 2 :

Slips at free-end of steel bar

v :

Loading rate

v 0 :

Quasi-static loading rate

α :

Rib inclination

β :

Parameters used to describe the descending branch of bond stress-slip curve

τ :

Bond stress

τ r :

Residual bond strength

τ u :

Ultimate bond strength

υ c :

Poisson’s ratio of concrete

υ s :

Poisson’s ratio of deformed steel bar

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Acknowledgments

The financial support from the National Natural Science Foundation with Grant Nos. 51278082 and 51421064 of the People’s Republic of China is greatly acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Xinxin Li, Zhimin Wu, Abdulmajid Alahdal & Wei Dong

  2. School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, 310014, People’s Republic of China

    Jianjun Zheng

Authors
  1. Xinxin Li
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  2. Zhimin Wu
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  3. Jianjun Zheng
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  4. Abdulmajid Alahdal
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  5. Wei Dong
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Corresponding author

Correspondence to Zhimin Wu.

Appendices

Appendix 1

See Table 3.

Table 3 Bond parameters for specimens in Series I subjected to uniaxial lateral pressure
Full size table

Appendix 2

See Table 4.

Table 4 Bond parameters for specimens in Series II subjected to uniaxial lateral pressure
Full size table

Appendix 3

See Table 5.

Table 5 Bond parameters for specimens in Series III subjected to uniaxial lateral pressure
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Li, X., Wu, Z., Zheng, J. et al. Effect of loading rate on the bond behaviour of deformed steel bars in concrete subjected to lateral pressure. Mater Struct 49, 2097–2111 (2016). https://doi.org/10.1617/s11527-015-0636-0

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  • DOI: https://doi.org/10.1617/s11527-015-0636-0

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