使用电机阻抗技术和数字图像相关系系统分析FRP增强钢筋混凝土梁
Ricardo Perera1, María Consuelo Huerta1, Marta Baena2
1Department of Mechanical Engineering, Technical University of Madrid, 28006 Madrid, Spain.
Sensors (Basel, Switzerland)
|November 14, 2023
概括
监测混凝土结构中纤维增强聚合物 (FRP) 增强的情况至关重要. 这项研究使用了电机阻抗和数字图像相关性来检测早期裂,并预测外部结合强化和近表面安装系统的故障.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 结构健康监测 结构健康监测
背景情况:
- 纤维增强聚合物 (FRP) 强化增强了混凝土结构,但存在脆弱脱失败的风险.
- 有效的长期监测FRP强化系统是一个重大挑战.
- 外接增强 (EBR) 和近表面安装 (NSM) 是常见的FRP增强技术.
研究的目的:
- 评估结合电机阻抗 (EMI) 和数字图像相关性 (DIC) 的有效性,用于监测FRP增强混凝土.
- 检测和跟踪FRP增强钢筋混凝土 (RC) 标本中裂纹的启动和传播.
- 改善早期裂预测,预测加强结构的潜在故障.
主要方法:
- 两个钢筋混凝土 (RC) 标本,一个用EBR-FRP强化,另一个用NSM-FRP强化,经过增量负载测试.
- 基于压电 (PZT) 传感器的电机阻抗 (EMI) 技术被用于监测样本阻抗变化.
- 数字图像关联 (DIC) 系统捕获了表面应变形状,以识别和跟踪裂.
主要成果:
- 使用EMI测量的集群方法成功地表明了两种标本的裂发生和增长.
- DIC系统有效地描绘了表面毛线裂及其传播模式.
- 结合EMI和DIC的实施显示了在增量曲测试期间数据相关性的潜力.
结论:
- 集成的EMI和DIC技术为FRP加固混凝土结构中早期裂检测提供了一个有希望的方法.
- 这种综合监测策略可以提高结构行为的预测,并可能预测故障.
- 进一步的研究可以完善这些方法,以便对改装后的混凝土元素进行更强大的结构健康监测.
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