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The behaviour of anchored extended blind bolts in concrete?filled tubes

Tizani, Walid; Cabrera, Manuela; Mahmood, Mohammed; Ninic, Jelena; Wang, Fangying


Manuela Cabrera

Mohammed Mahmood

Jelena Ninic

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Assistant Professor in Structural Engineering


Extended Hollo-Bolts (EHBs) are blind bolts that have an extended bolt shank ending in an anchor nut. When used with concrete-filled tubes, the extension and the anchor in the concrete serve to enhance significantly the performance of both connection components: bolts in tension and tube face in bending. The enhancements are a result of confining the concrete, preventing local buckling of the steel tube and allowing the blind bolt to achieve a tensile strength equal to that of standard bolt+nut fasteners. Overall, the use of the EHB results in a moment-resisting bolted connection to hollow sections which can achieve rigid behaviour under certain configurations. This paper summarizes research work done to date on such connections at the University of Nottingham. This includes experimental, numerical and analytical modelling. The aim of the work is to provide a fundamental understanding of the behaviour of anchored blind bolt connections to concrete-filled columns, leading to the specification of appropriate design rules that allow the use of such bolted moment-resisting connections in practice. The work has proposed analytical models for: connection stiffness, column face-bending strength considering both single and group behaviour of bolt rows, anchored bolts in tension and anchored bolts under combined tension and shear.


Tizani, W., Cabrera, M., Mahmood, M., Ninic, J., & Wang, F. (2022). The behaviour of anchored extended blind bolts in concrete?filled tubes. Steel Construction, 15(S1), 51-58.

Journal Article Type Article
Acceptance Date Dec 16, 2021
Online Publication Date May 16, 2022
Publication Date May 1, 2022
Deposit Date Apr 22, 2022
Publicly Available Date May 2, 2023
Journal Steel Construction
Print ISSN 1867-0520
Electronic ISSN 1867-0539
Publisher Ernst und Sohn
Peer Reviewed Peer Reviewed
Volume 15
Issue S1
Pages 51-58
Keywords Composite connections; Concrete filled steel tubes; Blind Bolt; Extended Hollo-Bolt; Metals and Alloys; Mechanics of Materials; Building and Construction; Civil and Structural Engineering
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Additional Information Received: 2021-10-21; Accepted: 2021-12-16; Published: 2022-05-16


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