For the influence of corrosive environment, the reliability index of reinforced concrete structure will decrease in design reference period. A method of time-variant reliability is proposed based on method of moments. The resistance and load effect are described as random process. The random process is transformed into random variable by the method of equivalent resistance method. The time-variant reliability is carried on in design reference period accurately with consideration of characteristic of random variables which can provide supports for the management departments to take appropriate measures to reduce economic loss in the engineering circles.
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