Structural Engineering and Mechanics

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Shear behavior of a demountable bolted connector in steel-UHPC lightweight composite structures

  • Gu, Jin-Ben (Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Tongji University) ;
  • Wang, Jun-Yan (Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Tongji University)
  • Received : 2020.02.08
  • Accepted : 2021.12.07
  • Published : 2022.03.10
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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.

Keywords

Acknowledgement

The research described in this paper was financially supported by the Science and Technology Department of Zhejiang Province [grant number 2019-GXKY-01]. The financial supports are greatly appreciated.

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