Analytical behaviour of concrete-encased concrete-filled steel tubular (CFST) member under combined compression and shear load

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL Engineering Structures Pub Date : 2025-01-13 DOI:10.1016/j.engstruct.2025.119616

Zhi-Cheng Yang, Lin-Hai Han, Wei Li

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Abstract

This paper presents finite element analysis of the concrete-encased concrete-filled steel tubular (CFST) members under combined compression and shear load. A finite element model is established and validated through previous experimental results. Based on the validated model, the shear behaviour of concrete-encased CFST member is analysed, including typical failure modes, shear-deflection relationship, axial force-deflection relationship and deformation. The stress analysis reveals the force transfer mechanism of the aforementioned member. Furthermore, the parametric analysis is conducted on key parameters related to the external reinforced concrete (RC) component, the internal CFST component and loading conditions. The influence of each parameter on the shear performance of the members is clarified. The results show that the proportion of shear deformation to total deformation is affected not only by the shear span-to-depth ratio but also by the specific positions along the shear span. The "hybrid effect" between the internal CFST and external RC is evident in two aspects: the external RC provides confinement for the internal CFST, particularly in the transverse position, and effective vertical transfer of shear load from the external RC to the internal CFST through the "vertical strut". Finally, a simplified calculation method for concrete-encased CFST member under combined compression and shear load is proposed.

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来源期刊

Engineering Structures 工程技术-工程：土木

CiteScore

10.20

自引率

14.50%

发文量

1385

审稿时长

67 days

期刊介绍： Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.