变截面焊接钢吊车梁疲劳裂缝主要是由于变截面处有很大的应力集中所产生的。
The main form and cause of fatigue failure of steel crane beam are analyzed first, and focused the welded steel crane beam.
而后，在查阅大量文献的基础上，找到了计算连续钢吊车梁整体稳定性的简单方法；
Then, on the basis of extensive literatures, the author finds an easy way to check the elastic stability of continuous steel crane beams.
最后就重级工作制钢吊车梁上部区域出现疲劳裂缝的修复与加固方案提出了一些意见和建议。
Finally, it presents some advice and Suggestions for the repairing and strengthening method of fatigue crack of upper part of steel crane-girder in the high-frequency.
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