FATIGUE BEHAVIOR OF VARIABLE LOADED BRIDGE DETAILS NEAR THE FATIGUE LIMIT. Academic Article uri icon

abstract

  • The findings of the current NCHRP Project 12-15(5), ″Fatigue Behavior of Variable Loaded Details Near the Fatigue Limit,″ are highlighted. The main focus of the research is the examination of welding bridge details in the high-cycle, long-life regime. Large-scale plate girders with coverplate, web attachment, and web stiffener details are subjected to fatigue loading that simulates actual truck traffic. A Rayleigh type stress spectrum is used with the inclusion of an occasional overload exceeding the constant-amplitude fatigue limit. The frequencies of occurrence being considered for the overloads are 0. 1, 0. 05, and 0. 01 percent. The current test specimens also allow for a detailed study of distortion-induced fatigue cracking at a connection plate web gap detail. Results indicate that the retrofit method of drilled holes at the crack tip is inadequate at high levels of distortion.

author list (cited authors)

  • Keating, P. B., & Fisher, J. W.

publication date

  • January 1987