A project was conducted to determine residual fatigue life of transmission tower anchor bolts. Notched and fatigue precracked round bar specimens were used to simulate anchor bolt fatigue and to determine fatigue life experimentally. Fatigue precracked compact tension specimens were used to determine fatigue crack growth rate properties using a fracture mechanics approach. The effect of temperature on crack growth rate was also investigated. A method to estimate fatigue life of surface cracked round bars was developed and predictions were compared against experimental results. This paper shows how a fracture mechanics approach can be used to estimate residual fatigue life of cracked anchor bolts.

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