Flexural bearing capacity of diaphragm-Through joints of concrete-filled square steel tubular columns

Bin Rong, Rui Liu, Ruoyu Zhang, Zhihua Chen, Fafitis Apostolos

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


In order to investigate the flexural bearing capacity of panel zone of diaphragm-Through joint between concrete filled square steel tubular column and steel beam, four specimens were tested under static tension loads to study the mechanical properties and bearing capacity of diaphragm-Through joints with a failure mode of panel zone. Finite element models of these specimens were developed to simulate the test and compare the predicted failure modes, load-displacement curves and bearing capacities with the experimentally observed. It was found that the tensile load from the steel beam flange is mainly shared by the square steel tube and the diaphragm. The diaphragm plastic zone appears along the cross-section lines enclosed by the square steel tube and the influence of steel beam web on the plastic zone of the steel tube is significant and cannot be neglected. Computational models of yield lines on square steel tube and diaphragm are established based on the distribution pattern of the plastic zone, and an analytical method for the evaluation of the bearing capacity of the joint is proposed. The theoretical results and the experimental data are compared and found in good agreement.

Original languageEnglish (US)
Pages (from-to)487-500
Number of pages14
JournalSteel and Composite Structures
Issue number3
StatePublished - Feb 29 2016


  • Diaphragm-Through joint
  • Finite element analysis
  • Flexural bearing capacity
  • Static tensile loading experiment
  • Yield line

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Metals and Alloys


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