在地震负荷下实时监测钢筋混凝土的结构健康状况,使用动态OFDR
Jooyoung Lee1, Hyoyoung Jung1, Myoung Jin Kim1
1Korea Photonics Technology Institute (KOPTI), Gwangju 61007, Republic of Korea.
Sensors (Basel, Switzerland)
|September 27, 2025
概括
本研究引入了一种动态光频域反射计 (D-OFDR) 系统,用于精确的实时结构健康监测. 在可见的裂出现之前,D-OFDR平台有效地检测了钢筋混凝土结构中的地震引起的损坏.
科学领域:
- 结构工程 结构工程
- 光学传感技术的技术
- 材料科学 材料科学 材料科学
背景情况:
- 结构健康监测 (SHM) 对于评估基础设施完整性至关重要,特别是在地震负载下.
- 传统传感器在分布式传感和早期损坏检测方面存在局限性.
- 光频域反射计 (OFDR) 为高分辨率的应变测量提供了潜力.
研究的目的:
- 开发和验证一个紧的动态光学频域反射计 (D-OFDR) 平台,用于毫米级分布式应变传感.
- 允许实时监测受地震负荷影响的钢筋混凝土结构的结构健康状况.
- 为了证明系统在可见裂纹之前检测地震引起的损坏的能力.
主要方法:
- 一个具有双干扰仪架构的D-OFDR询问器 (主要用于传感,辅助用于补偿).
- 使用基于FPGA的双通道DAQ板进行高速数据采集.
- 一个双边触发方案,具有50 Hz双向扫描,用于100 Hz的询问速率.
主要成果:
- 实验室对钢梁的验证显示,与张力计相比,高频忠实度 (0.09 Hz误差).
- 在2米RC柱的摇摆表测试中,在地震刺激下发现了不同的损伤模式.
- 分布式应变数据显示频率从3.82Hz降低到1.48Hz,表明刚性降低和屈服.
结论:
- 双向扫描触发的D-OFDR方法提供了增强的实时监控能力.
- 这项技术在早期和精确地检测地震损害方面明显优于传统的点感应器.
- 在地震事件下,D-OFDR平台对钢筋混凝土结构的SHM有效.
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