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Structural Engineering and Mechanics Volume 81, Number 5, March10 2022 , pages 551-563 DOI: https://doi.org/10.12989/sem.2022.81.5.551 |
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Shear behavior of a demountable bolted connector in steel-UHPC lightweight composite structures |
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Jin-Ben Gu and Jun-Yan Wang
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| Abstract | ||
| Bolted connector could be an alternative to replace the conventional welded headed stud in steel-ultra high performance concrete (UHPC) lightweight composite structures. In this paper, a novel demountable bolted shear connector, consisting of a high-strength bolt (HSB) and a specially-designed nut which is pre-embedded in a thin UHPC slab, is proposed, which may result in the quick installation and disassembly, due to the mountable, demountable and reusable features. In order to study the shear behavior of the new type of bolted shear connector, static push-out tests were conducted on five groups of the novel demountable bolted shear connector specimens and one group of conventional welded headed stud specimen for comparison. The effect of the bolt shank diameter and aspect ratio of bolt on failure mode, shear stiffness, peak slip at the steel-UHPC interface, shear strength and ductility of novel bolted connectors is investigated. Additionally, design formula for the shear strength is proposed to check the suitability for assessment of the novel demountable bolted shear connectors. | ||
| Key Words | ||
| demountable; lightweight; reusable; shear behavior; ultra high performance concrete | ||
| Address | ||
| Jin-Ben Gu: Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Tongji University, No.4800, Caoan Road, Jiading District, Shanghai, China; College of Civil Engineering, Tongji University, No. 1239, Siping Road, Yangpu District, Shanghai, China Jun-Yan Wang: Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Tongji University, No.4800, Caoan Road, Jiading District, Shanghai, China | ||