Method for calculating fatigue life of suspender in corrosion fatigue coupling state

The invention provides a method for calculating the fatigue life of a suspender in a corrosion fatigue coupling state. In consideration of a relational expression among a fatigue load stress amplitude S, a critical corrosion pit depth of suspender crack initiation, a failure fracture critical dimension, an environmental corrosion factor chloride ion concentration, a pH value, a temperature, a rust pit depth and a failure fracture critical dimension and a fatigue cycle index in a corrosion fatigue coupling state, the relational expression is corrected through a corrosion experiment; and obtaining the fatigue life of the suspender from the pitting corrosion initiation stage to the crack propagation stage, obtaining the life of the suspender from the crack propagation stage to the fracture stage through the Paris law and increasing the corrosion influence, and finally obtaining the fatigue life expression of the suspender in the final corrosion fatigue coupling state by combining the two obtained lives. Through