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Assessment of Bond-Slip Performance of Fire Exposed High Strength Concrete with SD Rebar

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Abstract

This paper aims to assess the bond-slip performance of fire exposed high strength concrete (HSC) and SD 550 (super ductile) steel. The SD (super ductile) bars are comparatively more ductile and suited for fire hazards. Bond tests were conducted following RILEM specifications on both HSC and NSC. The samples were fire exposed to steady-state mode following the ISO-834 temperature–time graph. The load-slip response was used to analyze and understand the mechanism of bond NSC and HSC with SD bars exposed to various temperatures. A correlation between the load-slip behavior and the bond-temperature relationship is provided based on test findings. High-strength concrete (HSC), after exposure to 450°C, showed greater bond strength reductions than its normal strength counterpart. The distinctions in the bond response of normal and high-strength concrete (HSC) and characterize the load-slip response on account of exposure to various levels of extreme temperatures have been discussed. Predictive models have been suggested for the degradation of bonds and corresponding slip as well as models to demonstrate the overall response in terms of bond-slip of high-strength concrete exposed to various temperatures.

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Data Availability

All data, models, and code generated or used during the study appear in the submitted article in tables and can be reused for academic purposes.

Abbreviations

NSC:

Normal strength concrete

HSC:

High strength concrete

SD:

Super ductile

τ :

Arbitrary value of bond stress on load slip curve

S :

Arbitrary value of slip on load slip curve

S max :

Slip of rebar at the failure of the specimen

τ 0 :

Ultimate bond strength of control specimen

τ 0T :

Ultimate bond strength of specimen exposed to T°C

S 0 :

Slip at peak load of control of specimen

S 0 T :

Slip at peak load of the specimen after exposure to T°C

\(\overline{{\tau }_{0}}\) :

Normalized value of bond strength

\(\overline{{S }_{0}}\) :

Normalized value of slip at peak bond

\(\overline{{\tau }_{0{\text{T}}}}\) :

Normalized value of bond strength after exposure to T°C

\(\overline{{S }_{0}^{T}}\) :

Normalized value of slip at peak load after exposure to T°C

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Funding

IIT Roorkee, (MHRD) Ministry of Human resources and development, funds the research; university grants commission (UGC) government of India.

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  1. IIT Roorkee, GLA University Mathura, Mathura, India

    Faraz Tariq

  2. Uttaranchal University Dehradun, Uttarakhand, India

    Faraz Tariq

  3. Jahangirabad Institute of Technology, Barabanki, India

    Faraz Tariq

  4. Civil and Environmental Engineering, Imperial College London (ICL), London, UK

    Hamza Hasan

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Tariq, F., Hasan, H. Assessment of Bond-Slip Performance of Fire Exposed High Strength Concrete with SD Rebar. Fire Technol (2024). https://doi.org/10.1007/s10694-023-01534-0

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