Size Effects on the Fatigue Behaviour of Welded CHS Bridge Joints

In welded circular hollow section (CHS) joints typical to the bridge application lower fatigue strength for joints with thicker failed members was observed. In this paper, a re-examination of the data on which the correction for size effect in the current specifications is based is made. It raised questions about its validity, especially for joints with greater wall thicknesses. Fatigue lives of welded K-joints in CHS, calculated based on a linear elastic deterministic fracture mechanics model have shown that the relative fatigue strength of these joints, as affected by changes in wall thickness, joint scale and loading, produces a so-called size correction that is substantially different than that in the specifications. Furthermore, a general description of the methodology of performing fatigue-reliability analysis of the size effect of a whole joint using a probabilistic fracture mechanics model and its validation by testing is given.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 26p
  • Monograph Title: First International Conference on Fatigue and Fracture in the Infrastructure: Bridges and Structures of the 21st Century

Subject/Index Terms

Filing Info

  • Accession Number: 01091759
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 8 2008 12:32PM