Damage mechanism of splitting failure of steel fiber-reinforced concrete based on PCA

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (1) : 221-231.

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Damage mechanism of splitting failure of steel fiber-reinforced concrete based on PCA

LI Tao1, REN Huilan*1, NING Jianguo1, SONG Shuizhou2, TAN Rijing1

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Abstract

The study of meso-damage evolution in steel fiber concrete is important for the health inspection of in-service steel fiber concrete structures. A multi-channel acoustic emission system was used to collect acoustic emission signals from concrete and steel-fiber concrete specimens (steel fiber content of 15 and 45 kg/m3, respectively.) during splitting tests. Then, the damage characteristics of concrete and steel fiber concrete are analyzed by combining principal component analysis and k-means clustering algorithm. Research showed that steel fiber inhibits the propagation of cracks in concrete and effectively improve the post-peak toughness of concrete. The acoustic emission characteristics parameter of counts and energy changes reflect the meso-damage evolution process of macroscopic deformation and failure in steel fiber concrete. Finally, two damage mechanisms are identified for mortar matrix cracking and steel fiber pullout in steel fiber concrete. Compared with mortar matrix cracking, the acoustic emission signals generated by steel fiber pull-out behaviors have the characteristics of high count, high amplitude, strong energy, and long duration.

Key words

steel fiber-reinforced concrete / acoustic emission / principal component analysis / k-means

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LI Tao1, REN Huilan1, NING Jianguo1, SONG Shuizhou2, TAN Rijing1. Damage mechanism of splitting failure of steel fiber-reinforced concrete based on PCA[J]. Journal of Vibration and Shock, 2025, 44(1): 221-231

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