Experimental study on demountable steel ultra-high performance concrete composite slabs under hogging moment

Demountable steel–concrete composite structures have attracted much attention from researchers because of its fast construction, demountability and environmental friendliness. Using ultra-high performance concrete (UHPC) in the hogging moment regions of demountable steel–concrete composite structure...

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Bibliographic Details
Published in:Archives of Civil and Mechanical Engineering 2022-06, Vol.22 (3), p.137, Article 137
Main Authors: Guo, Jun-Yuan, Wang, Jun-Yan, Wang, Yan-Bo, Gao, Xiao-Long, Bian, Chen
Format: Article
Language:English
Subjects:
Civil Engineering
Composite structures
Concrete
Concrete slabs
Constitutive models
Design
Elastic limit
Engineering
Failure modes
Mathematical models
Mechanical Engineering
Metal fatigue
Numerical analysis
Original Article
Shear forces
Shear strength
Shear tests
Slip
Steel structures
Stiffness
Strain hardening
Structural Materials
Studs
Tensile strength
Ultimate tensile strength
Ultra high performance concrete
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Summary:Demountable steel–concrete composite structures have attracted much attention from researchers because of its fast construction, demountability and environmental friendliness. Using ultra-high performance concrete (UHPC) in the hogging moment regions of demountable steel–concrete composite structures might improve their crack resistance and flexural performance. In this study, the cracking behavior, failure mode, stiffness, ultimate strength and relative slip of demountable steel-UHPC composite slabs with different stud spacings and longitudinal reinforcement ratios under hogging moment were experimentally investigated. A welded steel-UHPC composite slab was also tested to compare its behavior with the demountable slabs. The test results show the demountable steel-UHPC composite slabs have excellent crack control ability under hogging moment due to the slip of threaded headed stud and the strain hardening behavior of UHPC; the relative slip is directly associated with the stud spacing and controlled by the friction and shear force of threaded headed studs. As compared to the welded composite slab, the demountable composite slab can be easily separated after loading, the flexural capacity is slightly smaller, while the crack control ability is better and the ductility is higher. A constitutive model considering the reduction of tensile strength of UHPC after reinforcement was adoptedl the design formulas were developed to predict the elastic limit and the ultimate moment, and the bending stiffness of the demountable composite slabs under hogging moment. The test results verify the applicability of the proposed constitutive model of UHPC and design formulas.
ISSN:2083-3318
1644-9665
2083-3318
DOI:10.1007/s43452-022-00458-w