基于剪力钉群连接件推出试验的声发射特征信号分析OACHSSCD

Shear connectors are critical for the composite action in steel-concrete girders,and their performance directly affects the safty and durability of the overall structhre.To investigate the shear performance and damage mechanism of stud clusters,acoustic emission(AE)monitoring was conduc-ted during push-out tests on 6 specimens.The effects of stud number and vertical spacing on AE char-acteristics were analyzed.By comparing load-slip curves with AE energy histories,the damage pro-gression inside the connectors was revealed,along with energy levels and signal features at each stage,k-means clustering was applied to classify signal types.The results indicate that AE event counts increased significantly in the late elastic stage.During the plastic stage,interfacial debonding continued,and the cumulative ring-down count rose most rapidly upon stud shear failure.Before fail-ure,AE signals changed abruptly.Afterward,signal counts grew,with the highest energy release oc-curring during stud fracture.K-means clustering categorized AE signals into three types corresponding to failure modes in steel-concrete composite beams.