华中科技大学学报（自然科学版）2025，Vol.53Issue(2)：111-119,9.DOI:10.13245/j.hust.250072
基于宽频激励混合声场的钢筋混凝土梁微裂缝无损检测
Nondestructive testing of microcracks in reinforced concrete beams based on nonlinear ultrasonics modulation with broadband excitation
摘要
Abstract
A nondestructive detection method of micro cracks in reinforced concrete beams based on broadband excitation mixed sound field was proposed.Microcracks were generated by applying external loads to reinforced concrete beams,and the influence of the width and distribution of micro cracks on the propagation of broadband excitation mixed sound field was studied.Finally,the damage status of members was evaluated.The micro cracks of the beam were generated by the four-point bending test.For the surface of the damage research area,speckle was made to build the image detection system,and the ultrasonic detection system was built at the position of the piezoelectric plate.The results show that the generation and distribution of microcracks have a significant impact on the effect of signal modulation and the calculated damage index peak parameters.When the width of microcracks reaches 0.035 mm and the crack density reaches 7 m/m2,the presence of microcracks can be detected.The influence of different damage conditions of reinforced concrete beams on the damage index parameters calculated by nonlinear ultrasonic modulation method was explored by using the joint modeling of concrete plastic damage model(CDP)and cohesive element,and the damage index conditions at different beam heights were judged,which realizes the effective judgment of the crack propagation trend at the stage of micro crack.This method is not affected by the interference of steel reinforcement and can effectively identify micro cracks in reinforced concrete beams.关键词
钢筋混凝土梁/宽频激励非线性调制技术/损伤指标/内聚力/混凝土塑性损伤模型Key words
reinforced concrete beams/nonlinear acoustic modulation technique with broadband excitation/damage index/cohesive force/concrete plastic damage model分类
建筑与水利引用本文复制引用
王青原,许颖,孙浩轩..基于宽频激励混合声场的钢筋混凝土梁微裂缝无损检测[J].华中科技大学学报（自然科学版）,2025,53(2):111-119,9.基金项目
国家自然科学基金面上项目(52078173,51778191) （52078173,51778191）
广东省自然科学基金面上项目(2024A1515011980) （2024A1515011980）
广东省土木工程智能韧性结构重点实验室资助项目(2023B1212010004) （2023B1212010004）
深圳市基础研究专项(自然科学基金)基础研究面上项目(JCYJ20240813110505008) （自然科学基金）
深圳市高等院校稳定支持项目(GXWD20231129175636001) （GXWD20231129175636001）
深圳市科技计划项目(KJZD20230923115206014). （KJZD20230923115206014）
