Abstract
The load history of most in-service steel bridges was missing, and the realization of structural fatigue damage state reconstruction was an important prerequisite to secure the safety of structures in service. Based on the principle of damage equivalence, a method for assessing the fatigue damage state of the steel bridge during service is proposed. Firstly, the fatigue damage accumulation under different load spectra is calculated by linear damage accumulation criterion. On this basis, the fatigue damage of welded details is evaluated using the fatigue crack information obtained from the observation of inservice steel bridges. The linear combination of load spectrum equivalent to structural fatigue damage is resolved, and the fatigue damage assessment and forecast of steel bridges in service are accomplished. This paper provides a new idea and method for fatigue damage assessment of in-service steel bridges.
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