Damage mechanism of splitting failure of steel fiber-reinforced concrete based on PCA
Studying microscopic damage mechanism of splitting failure in steel fiber-reinforced concrete is of great significance for health monitoring of in-service steel fiber-reinforced concrete structures.Here,by using a multi-channel acoustic emission system,acoustic emission signals in splitting failure process of concrete specimens and steel fiber-reinforced concrete specimens with steel fiber contents of 15 and 45 kg/m3,respectively were collected.By combining principal component analysis(PCA)and k-means clustering algorithm,damage features of concrete and steel fiber reinforced concrete were analyzed.The results showed that adding steel fibers suppresses crack propagation in concrete and effectively improves post peak toughness of concrete;acoustic emission counting and energy parametric variation features reflect micro damage evolution process of macroscopic deformation and failure of steel fiber-reinforced concrete specimens;2 damage mechanisms including mortar matrix cracking and steel fiber drawing are finally identified in steel fiber-reinforced concrete;compared with mortar matrix cracking,acoustic emission signals generated by steel fiber drawing have features of high counting,high amplitude,strong energy and long duration.
万方数据
维普
