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疲劳检算是铁路钢桥设计的重要组成部分,为改变现行《桥规》疲劳检算方法的缺点,本文研究建立以疲劳随机过程理论为基础,用疲劳可靠度设计代替现行《桥规》的容许应力设计。在新的《桥规》中采用这一设计方法,不仅可以预计设计基准期内结构疲劳功能的失效概率,并且可以均衡同一结构中各结构细节的疲劳功能水平,这对铁路桥梁建设有重要的安全与经济意义。
In order to change the shortcomings of the current “bridge gauge” fatigue checking method, fatigue checking is an important part of the design of the railway steel bridge. Based on the theory of fatigue stochastic process, this paper studies the design method of fatigue reliability to replace the existing “bridge gauge” Stress design. The adoption of this design method in the new bridge gauge not only predicts the probability of failure of the structural fatigue function during the design base period but also equalizes the level of fatigue function for each structural detail in the same structure that is important for railway bridge construction Safety and economic significance.