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Experimental study of damage evolution in cuboid stirrup-confined concrete

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Abstract

This paper presents an experimental study on cuboid stirrup-confined concrete specimens under uniaxial monotonic loading and cyclic loading. The effects of stirrup volume ratio, stirrup yield strength, and concrete strength on damage evolution of the stirrup-confined concrete were investigated. The experimental results showed that the strength and ductility of concrete are improved by appropriate arrangement of the stirrup confinement. Firstly, with the increase of the stirrup volume ratio, the damage evolution of concrete can be relatively restrained. Secondly, higher stirrup yield strength usually leads to larger confining pressures and slower damage evolution. In contrast, higher concrete strength leads to higher brittleness, which accelerates damage evolution. Based on the experimental data, a plastic strain expression is obtained through curve fitting, and a damage evolution equation for stirrup-confined concrete is proposed by introducing a confinement factor (C). The comparisons results demonstrated that the proposed damage evolution curve can accurately describe the experimental results.

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Abbreviations

d :

Stirrup diameter

s :

Stirrup spacing

ρ v :

Stirrup volume ratio

λ v :

Stirrup characteristic value

f y :

Stirrup yield strength

f cu :

Compressive strength of the concrete

F 0 :

Ultimate load of the unconfined concrete

F c :

Ultimate load of the stirrup-confined concrete

E 0 :

Elastic modulus of the unconfined concrete

E c :

Elastic modulus of the confined concrete

E u :

Secant stiffness of the line connecting the present unloading point to the next loading point

f c0 :

Peak compressive stress of the unconfined concrete

f cc :

Peak compressive stress of the stirrup-confined concrete

ε :

Strain

Δε :

Strain increment

ε c0 :

Peak compressive strain corresponding to f c0

ε cc :

Peak compressive strain corresponding to f cc

ε cu :

Ultimate compressive strain of the unconfined concrete

ε ccu :

Ultimate compressive strain of the stirrup-confined concrete

ε ce :

Elastic compressive limit strain of the stirrup-confined concrete

ε p :

Plastic strain

ε in :

Plastic strain at the interval point

D c :

Damage indicator of unconfined concrete

D cc :

Damage indicator of stirrup-confined concrete

C :

Confinement factor

C in :

Confinement factor corresponding to ε in

Y c :

Damage energy release rate function

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Acknowledgments

The authors would like to thank the Major International (Sino-US) Joint Research Project of the National Natural Science Foundation of China (Grant No. 51261120374), the National Natural Science Foundation of China (Grant No. 51378007), and Shenzhen Technology Innovation Program - Technology Development Projects (Grant No. CXZZ20140904154839135).

Author information

Authors and Affiliations

  1. Shenzhen Key Lab of Urban & Civil Engineering Disaster Prevention & Reduction, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China

    Hongyu Li, Jun Teng & Zuohua Li

  2. School of Civil and Environment Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China

    Hongyu Li, Jun Teng & Zuohua Li

  3. Faculty of Science, Engineering & Built Environment, School of Engineering, Deakin University, Waurn Ponds, VIC, 3216, Australia

    Ying Wang

  4. Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China

    Dujian Zou

Authors
  1. Hongyu Li
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  2. Jun Teng
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  3. Zuohua Li
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  4. Ying Wang
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  5. Dujian Zou
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Corresponding author

Correspondence to Zuohua Li.

Appendix

Appendix

See Figs. 10 and 11.

Fig. 10
figure 10

Cyclic stress–strain curves of unconfined concrete specimen AP0Y0 and CP0Y0

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Fig. 11
figure 11

Cyclic stress–strain curves of stirrup-confined concrete specimen AP1Y1; AP2Y1; AP3Y1; BP2Y1 and CP2Y1

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Li, H., Teng, J., Li, Z. et al. Experimental study of damage evolution in cuboid stirrup-confined concrete. Mater Struct 49, 2857–2870 (2016). https://doi.org/10.1617/s11527-015-0691-6

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