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.
因此，在设计基准期预先确定条件下，化工结构的设计可靠度水平应综合考虑腐蚀性环境及其对建筑结构的影响特点来决策。
On the condition that the design service life is confirmed, the design reliability level of the chemical structures should include the corrosive environment and its effect on the structures.
对于高速公路大桥的抗震设防，应给出80年代设计基准期63 ％ 、10 ％和2 ％三个超越概率水准的设计地震动参数；
To the aseismic fortification of bridge of high way, three designing ground motion parameters with surpassing probabilities of 63%, 10% and 2% for 80 years should be given.
对于高速公路大桥的抗震设防，应给出80年代设计基准期63 ％ 、10 ％和2 ％三个超越概率水准的设计地震动参数；
To the aseismic fortification of bridge of high way, three designing ground motion parameters with surpassing probabilities of 63%, 10% and 2% for 80 years should be given.
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