为了对桥式起重机的损伤情况进行判断，提出了一种基于声发射信号强度与持续时间关系的裂纹损伤检测方法。该方法通过对不同工况下声发射信号的持续时间和信号强度的关联点图的对比分析，提出了一种用于检测裂纹损伤的斜率趋势指标，并对桥式起重机主梁完整结构和与其材料相同的预制裂纹试验件进行了试验。结果表明，无缺陷起重机结构与缺陷起重机结构获得的关联图具有不同的斜率趋势，可以为起重机损伤情况的判断提供参考。

In order to judge the damage condition of bridge crane, a crack damage detection method of bridge crane was proposed based on the relationship between acoustic emission signal intensity and duration. By comparing and analyzing the correlation point plots of acoustic emission signal duration and signal intensity under different working conditions, a slope trend index for crack damage detection was proposed. An experimental study was carried out on the whole structure of bridge crane girder and the prefabricated crack test pieces of the same material. The experimental results showed that the correlation figures of the faultless crane structure and the defective structure had different slope trends. It provided a method and reference for judging crane damages by using acoustic emission technology.