The concept of the structural performance safety index is put forward and its calculation method is derived based on the structural deformation limit state equation.
提出了结构性能安全指数的概念，并以结构的变形极限状态方程为基础得到了结构设计性能安全指数的计算方法和结构性能等级的划分标准。
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.
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.
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。
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