This study aims at the analysis on local hot spot stress in critical components of long - span steel bridges and numerical simulation on the accumulated fatigue damage for the purpose of providing an accurate assessment of the accumulated fatigue damage and fatigue life of the components 本文的研究工作是围绕着大跨度桥梁在交通荷载作用下,关键焊接构件的局部热点应力分析和相应的疲劳损伤累积分析而展开的,目的为了对这些焊接构件内的疲劳损伤累积的过程进行比较准确的评估。