针对直角突变式钢吊车梁疲劳细节Ⅰ发生的疲劳破坏,提出了一种经济有效且具有工程可实施性的圆钢管加固方法,即在吊车梁变截面部位焊接圆形钢管,分別与插入板和端封板进行焊接连接.为了评估加固后钢吊车梁的疲劳性能,基于线弹性断裂力学进行了三维裂纹扩展模拟.结果表明:该方法可以改善直角突变式钢吊车梁的局部应力状态;相较于加固前,疲劳细节Ⅰ处的应力幅降低了近40%,钢吊车梁的疲劳寿命提高了225.5万次.通过参数分析,进一步探讨了圆钢管不同外径及壁厚对加固效果和经济效益的影响规律,为吊车梁疲劳加固工程的应用提供了参考依据.
In view of the fatigue damage to the fatigue detail I of the steel crane girder with abrupt right-angled change, an economic, effective, and feasible round steel tube reinforcement method was proposed. Specifically, a round steel tube was welded at the variable section of the crane girder, and a welding connection with the insert plate and the end sealing plate was performed. In order to evaluate the fatigue performance of the reinforced steel crane girder, a three-dimensional crack growth simulation was conducted based on linear elastic fracture mechanics. The results showed that this method could improve the local stress state of the steel crane girder with abrupt right-angled change. Compared with that before reinforcement, the stress amplitude at the fatigue detail I had decreased by nearly 40%, and the fatigue life of the steel crane girder had increased by 2 255 000 times. Through parameter analysis, the influence laws of different outer diameters and wall thicknesses of the round steel tube on the reinforcement effects and economic benefits were further explored, providing a reference basis for the application of crane girder fatigue reinforcement projects.
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