路面结构设计时为增加行车舒适性采用沥青混凝土路面，考虑交通量和设计年限，确定合理的路面厚度。
When designing pavement structure, we want to use bituminous concrete to improve driving comfort and to consider volume of traffic and hours of use to confirm thickness of pavement.
为了保证结构在设计寿命期内的安全使用，有必要对结构进行整体疲劳分析，评估其在设计年限内的疲劳损伤程度。
In order to ensure structural safety in the design working life, it is necessary to carry out integrity analysis of fatigue and to evaluate the degree of fatigue damage on the structure.
早期修建的小跨径钢桁梁悬索桥大部分已接近设计年限，正确评估其承载能力是桥梁维修、加固和技术改造的基本依据。
Most of Minisize span suspension Bridges with steel truss beam constructed in early age will approach its designed working life.
早期修建的小跨径钢桁梁悬索桥大部分已接近设计年限，正确评估其承载能力是桥梁维修、加固和技术改造的基本依据。
Most of Minisize span suspension Bridges with steel truss beam constructed in early age will approach its designed working life.
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