基于主成分方法研究钢纤维混凝土劈裂破坏的损伤机制

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (1) : 221-231.

土木工程

基于主成分方法研究钢纤维混凝土劈裂破坏的损伤机制

李涛1，任会兰*1，宁建国1，宋水舟2，檀日晶1

作者信息 +

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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文章历史 +

摘要

研究钢纤维混凝土劈裂破坏的细观损伤机制，对在役钢纤维混凝土结构的健康检测具有重要意义。通过多通道声发射系统，采集混凝土和钢纤维混凝土试件(钢纤维含量分别为15和45 kg/m3)劈裂破坏过程中的声发射信号，并结合主成分分析法和k-means聚类算法，对混凝土和钢纤维混凝土的损伤特征进行分析。结果表明，钢纤维的加入抑制了混凝土中裂纹扩展，有效地改善了混凝土的峰后韧性；声发射计数和能量参数变化特征反映了钢纤维混凝土试件宏观变形、破坏的细观损伤演化过程。最后，识别出了钢纤维混凝土中砂浆基体开裂和钢纤维拉拔的两种损伤机制。与砂浆基体开裂相比，钢纤维拉拔产生的声发射信号具有计数高、幅值高、能量强和持续时间长的特征。

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.

导出引用

李涛1, 任会兰1, 宁建国1, 宋水舟2, 檀日晶1. 基于主成分方法研究钢纤维混凝土劈裂破坏的损伤机制[J]. 振动与冲击, 2025, 44(1): 221-231

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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