International journal of steel structures (국제강구조저널)

Korean Society of Steel Construction (한국강구조학회)
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Stress Concentration Factors of N-joints of Concrete-filled Tubes Subjected to Axial Loads

  • Kim, In-Gyu (Civil Engineering Research Team, Daewoo E&C) ;
  • Chung, Chul-Hun (Department of Civil and Environmental Engineering, Dankook University) ;
  • Shim, Chang-Su (Department of Civil and Environmental Engineering, Chung-Ang University) ;
  • Kim, Young-Jin (Civil Engineering Research Team, Daewoo E&C)
  • Received : 2013.08.22
  • Accepted : 2014.11.05
  • Published : 2014.03.31
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Abstract

The use of concrete filled circular hollow steel section (CFCHS) members in bridge design is a relatively new concept. In the design of recently constructed steel-concrete composite bridges using CFCHS truss girders for the main load carrying structure, the fatigue verification of the tubular spatial truss joints is a main issue. This paper presents a comprehensive study on stress concentration in welded tubular steel N-joints. Finite element analyses are performed in order to derive stress concentration factors (SCFs) from hot-spot stresses for typical three load conditions. The SCF values are presented in the form of equations in terms of the non-dimensional joint parameters. The proposed SCF equation for CFCHS N-joints shows good agreement with the test results on a tubular girder model. The presence of infilled grout in the chord is found to reduce the SCF.

Keywords

References

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