Circular steel tubes filled with rubberised concrete under combined loading

Minhao Dong, Mohamed Elchalakani, Ali Karrech, Sabrina Fawzia, Mohamed Sadakkathulla Mohamed Ali, Bo Yang, Shao Qian Xu

Research output: Contribution to journalArticle

Abstract

The research on rubberised concrete (RuC) could promote the recycling of end-of-life tyres and reduce natural resource extraction. To mitigate the greatly reduced compressive strength and fully utilise the desirable characteristics such as improved ductility and energy absorption of RuC, confinement through a steel outer tube could be adopted. This paper investigated the effect of using circular steel tube as confinement of the RuC under axial, flexural and combined loading conditions. A total of 4 circular hollow tube sections with d/t (depth/thickness) ranging from 18 to 36 was used in this study. Three rubber replacement ratios (0%, 15%, 30%) by mass of the total aggregates were examined, along with 4 load eccentricities (0, 0.25d, 0.5d and bending) used to construct the interaction diagrams. As a result of the steel confinement, the difference in load capacity between RuC and normal concrete significantly reduced compared to the plain concretes. Additionally, RuC filled steel tube (RuCFST) members were more ductile than their normal concrete counterparts. The circular cross-section showed superior load carrying capacities compared to the square sections, due to a relatively uniform stress distribution in the cross-section. The interaction diagrams of RuCFST members could be reasonably predicted in terms of accuracy and safety of design. The tested moment capacity of RuCFST also greatly exceed the predicted values. This study has demonstrated the possibility of using RuCFST in applications where high energy absorption and ductility capacities were sought, for example, the structural members in seismic regions and flexible roadside barriers.

Original languageEnglish
Article number105613
JournalJournal of Constructional Steel Research
Volume162
DOIs
Publication statusPublished - 1 Nov 2019

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Steel
Concretes
Energy absorption
Ductility
Roadsides
Structural members
Rubber
Natural resources
Load limits
Tires
Compressive strength
Recycling
Stress concentration

Cite this

Dong, Minhao ; Elchalakani, Mohamed ; Karrech, Ali ; Fawzia, Sabrina ; Mohamed Ali, Mohamed Sadakkathulla ; Yang, Bo ; Xu, Shao Qian. / Circular steel tubes filled with rubberised concrete under combined loading. In: Journal of Constructional Steel Research. 2019 ; Vol. 162.
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Circular steel tubes filled with rubberised concrete under combined loading. / Dong, Minhao; Elchalakani, Mohamed; Karrech, Ali; Fawzia, Sabrina; Mohamed Ali, Mohamed Sadakkathulla; Yang, Bo; Xu, Shao Qian.

In: Journal of Constructional Steel Research, Vol. 162, 105613, 01.11.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Circular steel tubes filled with rubberised concrete under combined loading

AU - Dong, Minhao

AU - Elchalakani, Mohamed

AU - Karrech, Ali

AU - Fawzia, Sabrina

AU - Mohamed Ali, Mohamed Sadakkathulla

AU - Yang, Bo

AU - Xu, Shao Qian

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AB - The research on rubberised concrete (RuC) could promote the recycling of end-of-life tyres and reduce natural resource extraction. To mitigate the greatly reduced compressive strength and fully utilise the desirable characteristics such as improved ductility and energy absorption of RuC, confinement through a steel outer tube could be adopted. This paper investigated the effect of using circular steel tube as confinement of the RuC under axial, flexural and combined loading conditions. A total of 4 circular hollow tube sections with d/t (depth/thickness) ranging from 18 to 36 was used in this study. Three rubber replacement ratios (0%, 15%, 30%) by mass of the total aggregates were examined, along with 4 load eccentricities (0, 0.25d, 0.5d and bending) used to construct the interaction diagrams. As a result of the steel confinement, the difference in load capacity between RuC and normal concrete significantly reduced compared to the plain concretes. Additionally, RuC filled steel tube (RuCFST) members were more ductile than their normal concrete counterparts. The circular cross-section showed superior load carrying capacities compared to the square sections, due to a relatively uniform stress distribution in the cross-section. The interaction diagrams of RuCFST members could be reasonably predicted in terms of accuracy and safety of design. The tested moment capacity of RuCFST also greatly exceed the predicted values. This study has demonstrated the possibility of using RuCFST in applications where high energy absorption and ductility capacities were sought, for example, the structural members in seismic regions and flexible roadside barriers.

KW - Circular hollow section

KW - Combined loading

KW - Concrete-filled single-skin tubes

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