| 阎石,王雪南.钢筋混凝土锈蚀损伤软接触模型的非线性超声导波识别*[J].,2025,43(3):734-743 |
| 钢筋混凝土锈蚀损伤软接触模型的非线性超声导波识别* |
| The nonlinear ultrasonic guided waves detection of corrosion damage in reinforced concrete based on soft contact model |
| 投稿时间：2023-11-17 修订日期：2025-05-07 |
| 中文摘要: |
| 针对钢筋混凝土结构早期锈蚀损伤识别难的问题，通过软接触模型并结合超声导波检测技术，可实现钢筋混凝土结构锈蚀的早期识别。然而，目前缺少以层状锈蚀为基础的软接触模型及相关参数的确定方法与实验证明。将钢筋的锈胀问题简化为一个均匀的层状平面模型，并确立了整个锈胀过程中层表面接触压力与刚度；使用颗粒接触模型建立了锈蚀程度和超声导波非线性部分之间的关系；在数值分析时将锈蚀接触问题简化为一个软接触模型，并通过对比分析得到软接触中各参数和锈蚀程度之间的关系；通过理论分析与有限元计算及实验验证的方法证明了所提出方法的有效性。软接触模型得到的结果中，超声导波的非线性系数变化趋势和理论计算及实验结果一致。通过理论计算推导出二阶非线性系数和接触力之间的关系，得到一种基于非线性超声导波的钢筋混凝土早期锈蚀识别方法，该方法对基于软接触模型的钢筋混凝土结构锈蚀损伤的识别是有效的。 |
| 英文摘要: |
| In reinforced concrete (RC) structures, the early detection of rebar corrosion is challenging. This paper employs a combination of a soft contact model and ultrasonic guided wave detection techniques to address this issue. However, the method lacks experimental validation and a systematic approach to determine the relevant parameters. A uniform plane mechanical model is introduced to establish the relationship between various states of rebar corrosion expansion and layer-surface contact pressures. Building on this model, a soft pressure-dependent contact 2D finite element model is utilized to simulate the local corrosion layer. Theoretical methods demonstrate the consistency between the two models, and a comparison of finite element and experimental results validates the theoretical framework. Both sets of results indicate a continuous trend in the nonlinear coefficient of ultrasonic guided waves. The relationship between contact force and the second-order nonlinear coefficient is derived through theoretical calculations. A method for detecting early corrosion in reinforced concrete based on nonlinear ultrasonic guided waves is thus established. |
| DOI：10.11684/j.issn.1000-310X.2025.03.022 |
| 中文关键词: 钢筋锈蚀识别 非线性超声导波 层状结构 软接触模型 钢筋混凝土结构 颗粒链接触模型 |
| 英文关键词: Rebar corrosion detection Nonlinear ultrasonic guided waves Layered structures Soft contact model Reinforcement concrete structure Granular chain contact model |
| 基金项目: |
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