考虑不均匀沉降时，必须用到沉降作用的分项安全系数。
Where differential settlements are taken into account a partial safety factor for settlement effects should be applied.
对常用铁路桥梁的既有可靠指标进行了推算。校准范围和一简化的验算式，初步选择出分项安全系数。
Then, reliability indexes of existing typical railway bridges are estimated, and partial safety factors required in the bridge code are suggested.
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