设计基准期(design reference period)，结构设计所采用的荷载统计参数、与时间有关的材料性能取值，都需要选定一个时间参数，它就是设计基准期。我国所采用的设计基准期为50 年。
应调高设计基准期等参数；
讨论了钢轨的失效模式和设计基准期，建立了钢轨极限状态方程的功能函数。
The failure mode and the design reference period of the steel rail are discussed, and the steel rail's performance function at limit state is established too.
随着时间的推移，越来越多的桥梁将达到或接近其设计基准期，或因为各种原因发生结构性损伤。
With time going on, more and more Bridges will reach or approach their design service life and the structural damages will appear because of kinds of reasons.
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