Čápová Kristýna, Velebil Lukáš, Včelák Jan
University Centre for Energy Efficient Buildings, CTU in Prague, Buštěhrad 273 43, Czech Republic.
Sensors (Basel). 2020 Mar 17;20(6):1661. doi: 10.3390/s20061661.
Long-term structural health monitoring (SHM) plays an important role in the safety of public transport infrastructure such as bridges or tunnels and warns in the event of any emerging problem. This article describes development and testing of system based on fiber Bragg grating (FBG) sensors that can detect changes in strain and temperature. The first phase of the research has been focused on the development of new fiber optic sensors for the monitoring of concrete structures and their investigation in laboratory conditions. The work also shows novel applicability of the same FBG technology for glulam structures. Mechanical loading tests of the concrete beam as well as glulam beam with embedded sensors were carried out. Data measured by developed fiber optic sensors were compared with the readings from reference sensors as well as with the analytically calculated values. The achieved results proved good agreement between the measured data, analytical data and reference methods. In second phase of the research, the pilot installation of the sensors was carried out on the newly constructed prestressed-concrete bridge. The bridge was monitored throughout pre-stressing phase and monitoring continued after the completion of the construction works. Problems with the fragility of the sensors occurred during the measurements, but the obtained results provide a good basis for further improvement of the system.
长期结构健康监测（SHM）在桥梁或隧道等公共交通基础设施的安全方面发挥着重要作用，并在出现任何新问题时发出警告。本文介绍了基于光纤布拉格光栅（FBG）传感器的系统的开发和测试，该传感器可以检测应变和温度的变化。研究的第一阶段专注于开发用于监测混凝土结构的新型光纤传感器，并在实验室条件下对其进行研究。这项工作还展示了相同的FBG技术在胶合木结构中的新颖适用性。对嵌入传感器的混凝土梁和胶合木梁进行了机械加载测试。将开发的光纤传感器测量的数据与参考传感器的读数以及分析计算值进行了比较。取得的结果证明了测量数据、分析数据和参考方法之间的良好一致性。在研究的第二阶段，在新建的预应力混凝土桥上进行了传感器的试点安装。在整个预应力阶段对桥梁进行了监测，并且在建设工程完成后继续进行监测。在测量过程中出现了传感器易碎的问题，但获得的结果为系统的进一步改进提供了良好的基础。
