光纤传感器不同布设方式对应变传递的影响分析
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摘要
为对比不同光纤传感器布设方式对光纤应变传递率的影响,分别建立表贴式和埋入式两种光纤与被测结构的应变传递模型,推导相应的传递系数,通过有限元模型分析验证传递系数的准确性,并基于埋设长度进行敏感性对比分析。结果表明,当埋设长度为1m时,两种方式下光纤中段80%以上区域应变传递率接近1,基体应变均可有效传递至纤芯,两种布设方式均适用于类似结构。光纤两端区域传递率存在不同程度的降低,与埋入式相比,表贴式光纤的两端传递效率低的区域范围更大。敏感性分析表明,随着长度增加,光纤与基体之间的平均应变传递率增高,埋入式始终高于表贴式。因此,对于小型被测基体,布设埋入式光纤更合理;考虑施工及检修,表贴式适合应用于已建大型结构。
In order to compare the impacts of different optical fiber sensor layout on the strain transmission rate of the optical fiber sensor,the strain transfer models of the surface-bonded type and directly buried type were established to test substrates.The corresponding transfer rates were derived and numerical analysis of finite element model verified the accuracy of the transfer rate,sensitivity analysis and comparison based on the buried length being tested.The results show that when the buried length is 1 m,the strain transmission rate of more than 80% of the middle section of the fiber is close to 1 in both modes,and the strain of the concrete structure can be effectively transmitted to the core,both layouts are applicable to the similar structures.There is a different degree of reduction in the transmission rate at both ends of the fiber.Sensitivity analysis shows that as the buried length increases,the average strain transfer rate between the fiber and the substrate increases,and the buried type is always higher than the surface mount type.Therefore,it is more reasonable to lay in buried optical fibers for small-sized substrates to be tested;The surface-mounting type is suitable for largescale or the structures that has been built considering construction and maintenance.
In order to compare the impacts of different optical fiber sensor layout on the strain transmission rate of the optical fiber sensor,the strain transfer models of the surface-bonded type and directly buried type were established to test substrates.The corresponding transfer rates were derived and numerical analysis of finite element model verified the accuracy of the transfer rate,sensitivity analysis and comparison based on the buried length being tested.The results show that when the buried length is 1 m,the strain transmission rate of more than 80% of the middle section of the fiber is close to 1 in both modes,and the strain of the concrete structure can be effectively transmitted to the core,both layouts are applicable to the similar structures.There is a different degree of reduction in the transmission rate at both ends of the fiber.Sensitivity analysis shows that as the buried length increases,the average strain transfer rate between the fiber and the substrate increases,and the buried type is always higher than the surface mount type.Therefore,it is more reasonable to lay in buried optical fibers for small-sized substrates to be tested;The surface-mounting type is suitable for largescale or the structures that has been built considering construction and maintenance.
引文
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[2]魏世明.岩体变形光纤光栅传感检测的理论与方法研究[D].西安:西安科技大学,2008.
[3]吴永红,邵长江,周巍,等.智能全分布式光纤应变传感精度的研究[J].同济大学学报:自然科学版,2010,38(4):500-503,526.
[4] Huaizhi S,Xing L,Bin Fang,et al.Crack Detection in Hydraulic Concrete Structures Using Bending Loss Data of Optical Fiber[J].Journal of Intelligent Material Systems and Structures,2017,28(13):1 719-1 733.
[5] Huaizhi Su,Nan Zhang,Hao Li.Concrete Piezo Ceramic Smart Module Pairs-based Damage Diagnosis of Hydraulic Structure[J].Composite Structures,2018,183:582-593.
[6]徐芝纶.弹性力学简明教程(第三版)[M].北京:高等教育出版社,2002.
[7]毛江鸿.分布式光纤传感技术在结构应变及开裂监测中的应用研究[D].浙江:浙江大学,2012.
[8] Goodman S,Hassan Y,Halim A.Shear Properties as Viable Measures for Characterization of Permanent Deformation of Asphalt Concrete Mixtures[J].Transportation Research Record,2002,1789(1):154-161.
[9]包腾飞,李涧鸣,赵津磊.表面粘贴式塑料光纤与混凝土间应变传递模型及敏感性分析[J].水利水电科技进展,2018,38(5):59-64.
[10]杨孟,苏怀智,郭芝韵,等.PPP-BOTDA分布式光纤传感技术在水工结构物健康监测中的可行性探讨[J].中国科技论文,2014,9(5):499-506.