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Shear behavior of a perfobond strip with steel fiber-reinforced mortar in a condition without surrounding reinforcements

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Abstract

To sufficiently transmit the shear force of a perfobond strip shear connector in steel–concrete hybrid structures, the arrangement of the surrounding reinforcements is essential to improve the restraining effect around the perfobond strip. However, in cases of joint structures with small dimensions and rush work on site, because the arrangement of reinforcements in the joint is challenging, steel fiber-reinforced mortar (SFRM) can be used along with a perfobond strip to improve the restraining effect around the perfobond strip. This study investigates the shear behavior of a perfobond strip that uses SFRM without surrounding reinforcements. Push-out tests were conducted focusing on the effect of steel fibers inside the SFRM, SFRM compressive strength, perforation diameter, and dimensions of the mortar block around the perfobond strip. Findings of the study confirmed that the steel fibers inside the mortar contribute to the restraining effect around the perfobond strip, thus preventing a rapid drop in the shear force beyond the shear capacity of the perfobond strip. The shear capacity of the perfobond strip combined with SFRM increased with the perforation diameter, SFRM compressive strength, and dimensions of the mortar block around the perfobond strip. Several shear capacity evaluation equations proposed in previous studies are not applicable for evaluating the shear capacity of the perfobond strip that uses SFRM without surrounding reinforcements. Here, the shear capacity of the perfobond strip can be evaluated by considering the correlation between the experimental parameters of this study, but more test data are required.

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Acknowledgements

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Funding

This study was funded by Grant-in-Aid for Scientific Research (For Young Scientists (B), Grant Number 18K13816).

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Authors and Affiliations

  1. Department of Civil Engineering and Regional Design, Utsunomiya University, Utsunomiya city, 321-0904, Japan

    Nguyen Minh Hai, Akinori Nakajima & Shuichi Fujikura

  2. Yaita Civil Engineering Office, Tochigi Prefecture, Yaita City, 329-2163, Japan

    Takara Murayama

  3. Watanabe Construction Co., Ltd, Utsunomiya City, 321-0961, Japan

    Misaki Mori

Authors
  1. Nguyen Minh Hai
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  2. Akinori Nakajima
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  3. Shuichi Fujikura
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  4. Takara Murayama
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  5. Misaki Mori
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by NMH, AN, SF, TM, and MM. The first draft of the manuscript was written by NMH, and all authors commented on previous versions of the manuscript. All authors have read and approve the final manuscript.

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Correspondence to Nguyen Minh Hai.

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Hai, N.M., Nakajima, A., Fujikura, S. et al. Shear behavior of a perfobond strip with steel fiber-reinforced mortar in a condition without surrounding reinforcements. Mater Struct 53, 45 (2020). https://doi.org/10.1617/s11527-020-01474-z

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  • DOI: https://doi.org/10.1617/s11527-020-01474-z

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