Flexural performance of a novel pipe-roof structure and optimization of key parameters

Pengjiao Jia, Yatong Nie, Peixin Shi, Xi Jiang, Bo Lu, Wen Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

Considering shortcomings of the current technology in controlling ground surface settlement and reducing the effect of excavation on the surrounding environment. This paper presents an experimental study on the flexural performance of composite structures of concrete-filled steel tubes, which are proposed as a new type of pipe-roof structure. It is also called as steel tube slab (STS) structure. The most important feature of this structure is that the adjacent steel tubes are connected using flange plates, bolts, and concrete in the transverse direction, forming the supporting system after pouring concrete. The main design parameters considered in this investigation are the connection type, spacing between the tubes, welding of the top flange, and thickness of the bottom flange. By conducting six flexural experiments, the failure process and crack development in the composite beams and their load–displacement curves are investigated. The results of laboratory tests show that the composite beams exhibit ductile failure. Increasing connections between the steel tubes has an obvious effect on the load-carrying capacity and flexural stiffness. The spacing between tubes can improve the flexural stiffness of STS beams, while having a limited effect on the longitudinal load-carrying capacity of the STS structure. Welding of the top flange and thickness of the bottom flange shows limited effect on the flexural performance of STS composite beams. Moreover, a series of numerical models is established to further identify the optimum tube thickness-to-flange-thickness ratio in terms of the flexural bearing capacity and stiffness. The numerical solutions suggest that the optimum ratio of the flange thickness to the tube thickness is between 1.0 and 1.25. Finally, a theoretical model for the flexural stiffness of the cross-section of this structure is also proposed, and the predicted results are found to be in excellent agreement with the test results. The research results can provide references for design and construction of STS method.

Original languageEnglish
Article number107594
JournalJournal of Constructional Steel Research
Volume199
DOIs
Publication statusPublished - Dec 2022
Externally publishedYes

Keywords

  • Composite concrete-filled steel tube
  • Flexural performance
  • Parameter optimization
  • Pipe-roof structure
  • Theoretical model

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Metals and Alloys

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