应用断裂力学理论分析了桥式卸船机钢结构检测中出现的应力小而裂纹多的现象，分析了交变载荷对裂纹扩展的影响、裂纹产生的部位及原因、裂纹产生后的处理措施及注意事项，对实际工作中类似问题有一定的指导作用。%The paper analyzes the phenomenon with small stress and many cracks during steel structure detection of the bridge ship unloader, and the effect of alternating load on the crack expansion , the crack location, and cause, treat-ment of the cracks , and precautions , providing guidance for handling similar problems in practical work.
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