一是提出了科学确定修理周期要求，在参考线路累计通过总重的基础上，应用工程类比分析法和经济寿命分析法进行综合分析确定；
On the base of the reference of track total passing weight, the analysing methods of engineering analogy and economy life-span are put forword.
玻璃钢管工程寿命是管路工程设计的重要参数，是影响技术—经济竞争能力的关键因素之一。
Service life of fiberglass pipeline is an important parameter and the critical factor affecting the technical and economic competitiveness.
耐候性钢材以其耐腐蚀性能和全寿命成本经济性在欧美、日本等发达国家广泛应用于桥梁工程。
The weathering steel has been widely applied to bridges in the developed countries in Europe, America and in Japan owing to its good corrosion resistance behavior and life-cycle costing.
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