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Seismic behavior of steel reinforced ECC columns under constant axial loading and reversed cyclic lateral loading

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Abstract

The seismic performance of steel reinforced engineered cementitious composite (RECC) short columns was investigated in this study. RECC columns with various shear span-to-depth ratios, axial load levels and transverse reinforcement ratios, together with one control reinforced concrete (RC) short column, were tested under the combined action of constant axial loading and reversed cyclic lateral loading. Test results indicate that RECC columns are superior to RC columns in terms of ductility, energy dissipation capacity and damage tolerance. The control RC column and the RECC column with the smallest shear span-to-depth ratio (of 1.42) were found to fail in shear. All other RECC columns, with higher shear span-to-depth ratios, including one RECC column without stirrups, failed in a flexure-dominated manner. Furthermore, theoretical flexural strength and shear strength expressions of RECC columns were derived and validated by the test results.

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Abbreviations

A eff :

Effective shear area of section, A eff  = 0.8A g

A g :

Gross area of section

A sv :

Total cross-section area of transverse reinforcement within spacing s

b :

Width of column

d :

Effective depth of column

E :

Modulus of elasticity

E d :

Energy dissipation coefficient

E i :

Energy dissipation of the ith cycle

f c :

Cylinder compressive strength

f c,u :

Cubic strength

f t0 :

Cracking stress of ECC

f t1 :

Maximum tensile stress of ECC

f y :

Yielding stress of longitudinal reinforcement

f yv :

Yielding stress of transverse reinforcement

k μ :

Factor for influence of ductility on concrete shear capacity

K i :

Secant stiffness of specimen for the ith cycle

N :

Applied axial load on column

s :

Spacing of transverse reinforcement

V cr :

Measured shear force of initial diagonal cracking

V ECC :

Contribution of ECC to shear strength

V i :

Maximum lateral load for the ith cycle

V max :

Maximum shear strength of column

V m :

Equivalent shear force, V m  = M/H 0

V n :

Predicted shear strength

V s :

Contribution of transverse reinforcement to shear strength

V y :

Yield shear force of column

\(\bar{V}_{\hbox{max} }\) :

Average maximum strength of both direction

δ u :

Ultimate drift ratio of column

Δ i :

Displacement of column for the ith cycle

Δ max :

Displacement corresponding to the maximum shear force of column

Δy :

Yield displacement of column

\(\bar{\Delta }_{y}\) :

Average yield displacement of both directions

ε t0 :

Tensile strain at cracking stress f t0

ε t1 :

Tensile strain at maximum stress f t1

ε tu :

Ultimate tensile strain

ε c :

Compressive strain at peak stress f c

ε cu :

Compressive strain at peak stress f c

θ :

Shear crack angle

λ :

Shear span-to-depth ratio, shear span is the distance from the bottom of the column to the center point of application of the horizontal load

μ :

Displacement ductility of column

μ Δ :

Measured displacement ductility of column

ρ s :

Ratio of longitudinal reinforcement

ρ sv :

Area ratio of transverse reinforcement, ρ sv = A sv/(bs)

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Acknowledgments

The authors gratefully acknowledge the funding supports of the National Natural Science Foundation of China (Grant No. 51208093, 5141101015), the Doctoral Program of the Ministry of Education, China (Grant No. 20120092120021) and the Key Laboratory of Concrete and Prestressed Concrete Structures, Ministry of Education. The authors wish to thank Dr. Zhi Qiao, Dr. Chenhua Jin and Miss Jiwei Liu for their assistance in the experimental program.

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Authors and Affiliations

  1. Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing, 210096, China

    Chang Wu

  2. College of Civil Engineering, Tongji University, Shanghai, 200092, China

    Zuanfeng Pan

  3. Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China

    Zuanfeng Pan & R. K. L. Su

  4. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay Peninsula, Hong Kong, China

    C. K. Y. Leung

  5. School of Civil Engineering, Southeast University, Nanjing, 210096, China

    Shaoping Meng

Authors
  1. Chang Wu
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  2. Zuanfeng Pan
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  3. R. K. L. Su
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  4. C. K. Y. Leung
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Corresponding author

Correspondence to Zuanfeng Pan.

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Funding

This study was funded by the National Natural Science Foundation of China (Grant No. 51208093, 5141101015), the Doctoral Program of the Ministry of Education, China (Grant No. 20120092120021).

Conflict of interest

The authors declare that they have no conflict of interest.

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Wu, C., Pan, Z., Su, R.K.L. et al. Seismic behavior of steel reinforced ECC columns under constant axial loading and reversed cyclic lateral loading. Mater Struct 50, 78 (2017). https://doi.org/10.1617/s11527-016-0947-9

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