Learning Outcomes: | Upon successful completion of this course, an attendee will be able to:
-use current fatigue design specifications and identify differences between the AASHTO LRFD, Standard Specification, and Guide Specification;
-identify different fatigue damage models and understand the influence of residual stress on fatigue life;
-understand the nominal stress approach to fatigue design and how it differs from the fracture mechanics approach to fatigue;
-understand the mechanics of constraint induced fracture;
-understand the relationship between fatigue leading to fracture;
-understand that out of plane distortion can lead to fracture;
-identify and classify common fatigue-prone details consistent with the AASHTO classification system;
-understand the philosophy behind the development of the HS-15 "fatigue truck" as used in design;
-understand the concept of effective stress range and how the effective stress range relates to the maximum stress range;
-identify various cycle-counting procedures;
-identify details susceptible to fatigue cracking due to secondary stresses and out-of-plane distortion and identify effective retrofit solutions;
-identify potential fatigue problems which may occur in special situations such as curved bridges, skewed bridges, anchor bolts, and sign structures;
-identify and understand issues arising during fabrication as related to material, fracture toughness, defects, shop/field repairs, mill scale, tack welds, etc., and
-list differences in redundant and non-redundant bridges.
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