| 面向楼宇结构健康的光纤传感网络监测系统研究 |
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| 引用本文： | 肖菊,段鹏飞. 面向楼宇结构健康的光纤传感网络监测系统研究[J]. 红外与激光工程, 2021, 50(8): 20210263-1-20210263-7. DOI: 10.3788/IRLA20210263 |
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| 作者姓名： | 肖菊 段鹏飞 |
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| 作者单位： | 1.山西工程科技职业大学 设备工程学院，山西 晋中 030619 |
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| 基金项目： | 山西省重点研发计划(201903D321043) |
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| 摘 要： | 楼宇健康监测中对主体结构的整体应力场分布及其状态参数分析是在线状态评估技术的瓶颈性问题。为了全面地、连贯地反映建筑物的整体状态信息，搭建了一种面向建筑物主体结构的光纤传感网络，提出了一种将结构中应力场信息与整体位置偏移数据相对应的映射算法。算法根据材料力学和挠度理论将弯度矩阵用于应力场与位移场的换算。仿真分析了主结构体中水平梁与垂直梁在受到外部载荷时，其应力场的分布规律，从而为传感单元的铺设提供了量化依据。实验采用方形钢与工形钢模拟主结构，加载外部应力范围为200~1000 N，传感单元选用光纤光栅应变传感器，并采用同类型温度传感器进行温漂补偿。测试结果显示，水平梁与垂直梁的交叉位置处最敏感，波长偏移总量约25 nm，梯度距离0.5 m处波长偏移总量为16 nm，波长偏移量可以很好地反映应力场分布。根据波长偏移数据解算的主体结构位置偏移量平均误差7.46%和6.34%。方形钢和工型钢对应的应力与位置偏移量的平均比率分别为1.99×10?7 m和2.79×10?7 m。可见，该系统可以测试计算结构体的整体健康状态。
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| 关 键 词： | 光纤传感 结构健康 弯度计算 状态分析 |
| 收稿时间： | 2021-04-23 |
Research on optical fiber sensor network monitoring system for building structural health |
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| Affiliation: | 1.College of Equipment Engineering, Shanxi Vocational University of Engineering, Science and Technology, Jinzhong 030619, China2.College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | The analysis of the overall stress field distribution and state parameters of the main structure in building health monitoring is a bottleneck problem in the online state assessment technology. In order to comprehensively and consistently reflect the overall state information of the building, an optical fiber sensor network system was designed for the main structure of the building. A mapping algorithm was proposed, which established the relationship between the stress field information in the main structure and the position offset data of the overall structure. According to the theory of material mechanics and deflection, the deflection matrix was used for the conversion of stress field and displacement field. The simulation analyzed the distribution law of the stress field of the horizontal beam and the vertical beam in the main structure when the external load was applied, so as to provide a quantitative basis for the laying of the sensing unit. In the experiment, square steel and I-shaped steel were used to simulate the main structure. The load external stress range was 200-1000 N, fiber grating strain sensors were selected as sensing unit, and the same type of temperature sensors were used to compensate for temperature drift. The test results show that the intersection of the horizontal beam and the vertical beam is the most sensitive. The wavelength shift can well reflect the stress field distribution. The total amount of wavelength shift at this position is about 25 nm. At a gradient distance of 0.5 m, the total wavelength shift is 16 nm. The average error of the position offset of the main structure calculated is 7.46% and 6.34% based on the wavelength offset data. The average ratios of the corresponding stress to position offset for square steel and I-shaped steel are 1.99×10?7 m and 2.79×10?7 m, respectively. It can be seen that the system can test and calculate the overall health of the structure. |
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