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Title: Punching shear based design of concrete-filled CHS T-joints under in-plane bending
Authors: Xu, F 
Chan, TM 
Chen, J
Issue Date: 2018
Source: Proceedings of the 12th International Conference on Advances in Steel-Concrete Composite Structures (ASCCS 2018), Jun 27-29, 2018, University of Politecnica Valencia, Valencia, Spain 2018, p. 573-580
Abstract: The in-plane bending behaviour of concrete-filled circular hollow section (CHS) T-joints was examined in this paper. The main failure mode, the punching shear of the chord-wall, was observed from the test of four large-scale joints with the diameter ratio of brace to chord (beta) ranging from 0.44 to 0.85. The tube-wall deformation was measured to assess the governing failure mode of the composite joints. Complementary finite element (FE) methodology was verified against the experimental findings and the validated FE models were used to further investigate the mechanical behaviour and the design methodology. The feasibility to apply a fracture criterion in the material-level to a large-scale structural simulation was evaluated. The validated FE modes could successfully capture the tube-wall fracture initiation and propagation. Based on both experimental and numerical investigations, it was shown that the capacity of composite joints was governed by the ultimate strength limit, i.e. punching shear strength, due to the infill concrete that mitigated both inward and outward deformation on the compressive and tensile sides, respectively. The analytical model was established to reveal the composite actions between the tube and the inner concrete, and to elaborate the development of the flexural section-resistance. Finally, the design equation was proposed and could well predict the moment capacity.
Keywords: Concrete-filled steel tube
Tubular joint
In-plane bending
Punching shear
Publisher: University of Politecnica Valencia
DOI: 10.4995/ASCCS2018.2018.7513
Rights: 2018, Universitat Politècnica de València, CC BY-NC-ND. This work is licensed under a Creative Commons License Attribution-NonComercial-NoDerivatives 4.0 International (
The following publication Xu, F., Chan, T. M., & Chen, J. (2018, June). Punching shear based design of concrete-filled CHS T-joints under in-plane bending. In Proceedings of the 12th International Conference on Advances in Steel-Concrete Composite Structures. ASCCS 2018 (pp. 573-580). Editorial Universitat Politècnica de València is available at
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