Fatigue behavior of very high strength (VHS) circular steel tube to plate T-joints under in-plane bending

Hui Jiao, Fidelis Mashiri, Xiao Ling Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)

Abstract

This paper investigated the fatigue behavior of very high strength (VHS) steel tubes (t<2 mm) to steel plate T-joints under cyclic in-plane bending. VHS tubes, with a yield stress of 1350 MPa and an ultimate tensile strength of 1500 MPa, were welded to G350 steel plates using the GTAW welding method. Three different failure modes were observed. Stress concentration factors (SCFs) ranging from 1.2 to 2.2 were obtained through linear extrapolation at the weld toe. The fatigue life of VHS (t<2 mm) to plate T-joints subject to in-plane bending was determined using the hot spot stress approach with a stress concentration factor SCF=2.0 and the existing fatigue design equation in CIDECT Design guide No. 8. VHS tubes (t<2 mm) showed better fatigue life than cold formed CHS (2 mm≤t<4 mm) to plate T-joints when welded to plates and loaded under in-plane bending. A class of 102 was proposed for fatigue design of VHS-plate T-joints under in-plane bending based on the current steel design standards.

Original languageEnglish
Pages (from-to)106-112
Number of pages7
JournalThin-Walled Structures
Volume68
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Fatigue life
  • Hot spot stress
  • T-joints
  • Very high strength

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering

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