Numerical calculation methodology for stress intensity factors of cfchs welded T-joints

Min Gu, Le Wei Tong, Xiao Ling Zhao, Xiao Feng Wang

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

A truss made of circular hollow sections (CHS) in which the chord member is filled with concrete is a new kind of structure. In need of fatigue behavior assessment by means of fracture mechanics, the numerical calculation methodology for the stress intensity factors (SIF) of welded T-joints under brace axial tension is discussed in this paper. Firstly, the semi-elliptical surface crack model used for fracture mechanics analysis of the joint is presented on the basis of experimental results of hot spot stress distributions and fatigue cracks. Secondly, the parameter transformation equations for the chord, brace and concrete are deduced. Then, finite element models and singularity elements near the crack front are constructed using APDL of the software ANSYS. Finally, a displacement extrapolation method is used to calculate the SIF. It is concluded that the finite element modeling is reliable and the numerical calculation method is practicable.

Original languageEnglish
Pages (from-to)178-185
Number of pages8
JournalEngineering Mechanics
Volume28
Issue number5
Publication statusPublished - May 2011

Keywords

  • Crack propagation model
  • Displacement extrapolation method
  • Finite element analysis
  • Stress intensity factor
  • Welded joints between CHS and concrete-filled CHS

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