Abstract

Influence of load interaction on fatigue behavior of highway bridge components under service loading condition is to be clarified for better understanding of variable amplitude fatigue. Fatigue crack growth analyses considering crack closure effect are carried out on non-load-carrying cruciform joints under periodic overload (POL), variable amplitude block loading (BL) and variable amplitude (VA) loading. The analytical results are compared with those of the tests carried out in the past. Crack closure effect exists in most cases, and load interaction effect is significant under POL and BL. However, load interaction effect is insignificant under VA loading.

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