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Investigation on Bond Behavior between Self-compacting Rubberized Concrete and Rectangular Steel Tubes

  • Structural Engineering
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KSCE Journal of Civil Engineering Aims and scope

Abstract

The combination of self-compacting rubberized concrete (SCRC) and rectangular steel tubes to be a composite structure is a new attempt to apply it to a broader range of engineering fields while making up for the shortcomings of SCRC. This study presents experimental and analytical studies on the bonding behavior of rectangular self-compacting rubber concrete-filled steel tubes (SCRCFST). A total of 17 SCRCFST specimens were performed on push-out test with different parameters of 1) interface bonding length, 2) rubber aggregate replacement rate, 3) rubber particle size, and 4) water-cement ratio (W/C). Based on the failure mode, strain analysis, and the evolution of damage on the interface between the SCRC and steel tubes, test results determined the effects of the parameters, and a prediction equation for the bond strength was derived from developing a relationship of bond-slip. The results indicated that the increase of rubber content, rubber particle size, W/C harmed the bond strength of SCRCFST, and bond length had little effect on bonding strength. Furthermore, the strain distribution of the rectangular steel tube was not uniformly distributed. The achievement of this research is the investigation of the bonding properties of the new structure, to provide guidance for future research scholars.

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Abbreviations

a g :

Maximum particle size of rubber aggregate

A s :

Cross-sectional area of steel tubes

B :

Side length of the rectangular section

B l :

Side length of the long side of the rectangular section

B s :

Side length of the short side of the rectangular section

C a :

Length around the contact interface between the interior face of the steel tubes and the core concrete

E s :

Elastic modulus of steel

f cu :

Cube compressive strength of concrete

f u :

Ultimate strength of steel

f y :

Yield strength of steel

k :

The amount of expansion agent

L :

Length of steel tubes

L a :

Bonding length of steel tubes

P :

Load measured by the push-out test

P u :

Ultimate load

S :

Slip

S r :

Slip represented by the residual bond strength τr

S u :

Slip represented by the ultimate bond strength τu

t :

Wall thickness of steel tubes

T 500 :

Expansion time of SCRC

β :

Water cement ratio

γ :

Rubber content

ε :

Strain

ε(x):

Bond strain at location x

σ(x):

Stress at location x

τ :

Bond strength

τ u-act :

Ultimate actual bond strength

τ u-equ :

Ultimate bond strength of calculation results

τ r :

Residual bond strength

τ r-equ :

Residual bond strength of calculation results

τ u τ u-typ :

Ultimate bond strength

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Project No. 51668007 and 51508112), and the financial support is gratefully acknowledged.

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Correspondence to Xiaojun Ke.

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Ke, X., Tang, Z., Shen, J. et al. Investigation on Bond Behavior between Self-compacting Rubberized Concrete and Rectangular Steel Tubes. KSCE J Civ Eng 26, 3504–3519 (2022). https://doi.org/10.1007/s12205-022-1998-9

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  • DOI: https://doi.org/10.1007/s12205-022-1998-9

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