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分析了某３３ｍ跨钢屋架下弦平台梁产生穿透性显裂纹的原因；在假定初始缺陷形式的基础上进行了疲劳寿命分析；强调了初始施工质量对构件寿命有严重影响。
The cause of the penetrative cracks in the lower string platform beam of a 33m span steel truss was analyzed. The fatigue life analysis was carried out based on the assumption of the initial form of the defect. The initial construction quality was emphasized to have a serious influence on the component life.