市政技术2026，Vol.44Issue(5)：74-84,11.DOI:10.19922/j.1009-7767.2026.05.074
基于声发射的钢纤维增强UHPC弯曲断裂损伤机理研究
Study on the Bending Fracture Damage Mechanism of Steel Fiber Reinforced UHPC Based on Acoustic Emission
丁桂付 1房梦寒 1张强 2杨博 3孟召阳 2续丽君 2化振4
作者信息
- 1. 北京路桥瑞通养护中心有限公司,北京 101300
- 2. 北京市政路桥管理养护集团有限公司,北京 100097
- 3. 北京吉友佳检测技术有限公司,北京 100070
- 4. 北京鑫实路桥建设有限公司,北京 102300
- 折叠
摘要
Abstract
The influence of different steel fiber content(volume fraction)on the bending mechanical behavior and fracture performance of ultra-high performance concrete(UHPC)was studied,and the evolution mechanism of UHPC fracture failure was analyzed based on acoustic emission(AE)energy and peak frequency.The correlation between cumulative AE energy and fracture energy was explored.The research results indicate that there is a nonlinear rela-tionship between the steel fiber content and the fracture performance of UHPC.When the steel fiber content reaches 2.5％,all the fracture performance parameters such as peak bending load,double K model fracture toughness(in-cluding initiation toughness and instability toughness)and fracture energy of UHPC increase to the maximum val-ues;After exceeding this dosage,all the above indicators show a downward trend.The ductility index continues to increase with the increase of steel fiber content.AE energy and peak frequency can effectively characterize the dam-age differences during the fracture process of UHPC beams with different steel fiber contents.High energy AE events mainly occur in the steel fiber pull-out stage;With the increase of steel fiber content,the cumulative AE energy gradually decreases,indicating that steel fibers have a restraining effect on crack propagation to reduce the overall damage of the specimen.The peak frequency of AE signal in the range of 25～200 kHz can be regarded as the domi-nant AE frequency band for the generation and propagation of UHPC cracks,while the 225～375 kHz frequency band mainly corresponds to the steel fiber pull-out and shearing process,revealing the correspondence between the fracture damage stage and AE frequency characteristics.Finally,a significant linear negative correlation is estab-lished between the cumulative AE energy and the fracture energy of UHPC beams,providing a quantitative basis for the non-destructive evaluation of UHPC fracture performance by AE technology.关键词
UHPC/钢纤维掺量/断裂性能/声发射参数/能量演化Key words
UHPC/steel fiber content/fracture performance/acoustic emission(AE)parameter/energy evolution分类
建筑与水利引用本文复制引用
丁桂付,房梦寒,张强,杨博,孟召阳,续丽君,化振..基于声发射的钢纤维增强UHPC弯曲断裂损伤机理研究[J].市政技术,2026,44(5):74-84,11.
