Self-centering concrete-filled steel tubular column-steel beam joint: Experiment and numerical modeling

Ben Mou, Xingchen Yan, Kaiming Bi, Wei Pan, Chang He

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

This paper studied the seismic behavior of a novel self-centering concrete-filled steel tubular column-steel beam (SCSTCSB) joint. The restoring force was provided by the post-tensioned tendons arranged in the CFST columns. Cyclic loading tests were performed on five 1/3 scaled specimens by varying the parameters of steel tendon type, concrete strength (fc), and axial compression ratio (n). The failure modes, hysteresis behavior, stiffness and strength degradation, energy dissipation, post-tensioned tendons response, residual deformation, and strain distribution were studied in detail. The finite element models were established to capture the stress distribution of the joints. In addition, parameter analysis was performed by expanding 17 finite element models. The results show that the ratio of residual deformation to beam rotation angle of the specimens ranged from 0.068 to 0.172. And the proposed joints demonstrated excellent self-centering ability. The self-centering (SC) performance of joints with ordinary steel tendons was better than that of joints with high-strength steel tendons. With the increase of n, the SC performance of the joints intensified at the lower ratio (n from 0.1 to 0.3) and weakened after n = 0.3. The flexural capacity of the joints improved with the increase of axial compression ratio (n), width-thickness ratio (D/t), diameter of steel tendons (d), and assembly part strength (fy,a).

Original languageEnglish
Article number118272
JournalEngineering Structures
Volume312
DOIs
Publication statusPublished - 1 Aug 2024

Keywords

  • Column to beam joint
  • Experimental study
  • Finite element analysis
  • Parametric analysis
  • Seismic performance
  • Self-centering

ASJC Scopus subject areas

  • Civil and Structural Engineering

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