起重机钢结构的疲劳寿命计算，可采用应力比法或应力幅法。
Calculation of crane metal structure on fatigue life may be carried out according to either stress ratio or stress amplitude in related structure.
本文以600吨龙门吊为例研究了大型起重机钢结构的焊接制造工艺。
In this paper, 600 tons gantry was studied as an example of the construction process of large-scale crane structure.
文章探讨了起重机钢结构疲劳试验及疲劳设计的方法和内容，提出了新的观点。
This paper probes into the methods and contents of fatigue tests and fatigue design of crane's steel structure, and advances some new opinions.
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