Steel Bridge Design - Fatigue in Structural Members
Background required to understand and use the design rules for fatigue resistance that are currently a standard part of design codes for fabricated steel structures.
This course provides the practicing engineer with the background required to understand and use the design rules for fatigue resistance that are currently a standard part of design codes for fabricated steel structures.
Fatigue in metals is the process of initiation and growth of cracks under the action of repetitive tensile loading. If crack growth is allowed to go on long enough, failure of the member can result when the uncracked cross-section is sufficiently reduced such that the member can no longer carry the internal forces for the crack extends in an unstable mode. The fatigue process can take place at stress levels that are substantially less than those associated with failure under static loading conditions. The usual condition that produces fatigue cracking is the application of a large number of load cycles.
Overview and Historical Perspective
Introduction to Crack Growth
Flaws in Fabricated Steel Structures
Load-Induced, Distortion-Induced Fatigue
Stress Range as the Dominant Stress Parameter
Examples of Distortion-Induced Fatigue Cracking
Finite / Infinite Life Design
AASHTO Provisions / Specifications
This course is intended primarily for transportation, structural, civil, mechanical engineers, and other engineering professionals that have a job description that may require a general knowledge of steel bridge design principles regarding fatigue in structural members.