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某QZC40塔机在施工中其标准节主弦杆严重开裂 ,在对其设计计算、型材质量、焊接质量和操作情况全面审查并深入进行断裂特征分析后 ,确定该机是由于操作不当而导致标准节主弦杆产生低周疲劳损坏
In the construction of a QZC40 tower crane its standard section of the main chord crack, in its design calculation, quality of the profile, welding quality and operation of a comprehensive review and analysis of fracture characteristics, to determine the aircraft is due to improper operation of the standard The main chord section produces low cycle fatigue damage