概率断裂力学在吊车梁寿命评估中的应用
（内蒙古科技大学建筑与土木工程学院，包头 014010）
关键词：概率断裂力学；可靠度；吊车梁；疲劳寿命
中图分类号：TU375.2文献标识码：A
摘要：为了提高吊车梁寿命评估的精度，将概率统计引入评估之中。介绍了概率断裂力学（PFM）的原理，阐明了其计算流程，并推导出对应的计算公式，给出了寿命与可靠度的关系。同时应用概率断裂力学对服役中的吊车梁的疲劳寿命进行评估，得出吊车梁在循环载荷作用下的剩余疲劳寿命。
Application of Probabilistic Fracture Mechanics in
Life Evaluation of Crane Beam
CHENG Ran，XUE Gang，ZHANG Rong-chun
（Architecture and Civil Engineering School，Inner Mongolia University of Science and Technology，Baotou 014010，China）··
Keywords：ProbabilisticFracture Mechanics；reliability；cranebeam；fatigue life
Abstract：Theprobability statistics was introduced in evaluation in order to improve theprecision of the evaluation on life of crane beam．Theprinciple of Probabilistic Fracture Mechanics（PFM）was introduced，too,with thecalculation process of PFM discussed.The corresponding formulas was derived andthe relationship between life and reliability was given．Meanwhile，the fatiguelife of the in-service crane beam was evaluated by using PFM．The residual fatigue life of the crane beam under thealternating load was obtained．