采用加权平均法定出疲劳目标可靠度指标，推导了疲劳设计公式，并给出各分项系数的建议值。

With the method of weighting average, index of goal reliability for fatigue was dealt with. Formula of fatigue design for military bridge was presented. Subentry coefficients were suggested.

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以可靠度为目标，建立了一种备件需求模型，提出了迭代计算过程。

Then take reliability as the goal, established one kind of spare parts demand model, proposed the computation process.

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这一方法简单易行，采用目标可靠度指标，与现行的可靠度设计统一标准方法协调。

With using target reliability index, this method is easy to use, and harmonizes with the current reliability design standard.

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