FATIGUE OF STEEL BEAMS BY SIMULATED BRIDGE TRAFFIC

A review of field measurements on bridges under traffic showed that a family of Rayleigh probability-density curves can represent the frequency of occurrence of stress ranges of different magnitudes in actual bridges. A particular histogram for a bridge can be approximated by a particular curve from the family. Each curve is defined by: (1) The modal stress range, S sub rm; and (2) a parameter S sub rm, which is a measure of the width of the probability-density curve. Different combinations of S sub rd, which is a measure of the width of the probability-density curve. Different combinations of S sub rm and S sub rd were included. The variable-amplitude data can be related to the constrant-amplitude data by using an effective stress range to represent the variable-amplitude spectrum. The effective stress range is the constant-amplitude stress range that would result in the same fatigue life as the variable-amplitude spectrum, and may be taken as the root-mean-square stress range of the spectrum or calculated from Miner's law.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 1561-75
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00164891
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13123
  • Files: TRIS
  • Created Date: Nov 23 1977 12:00AM