作者：赵丽芝1, 唐福建1, 周智2
作者单位：1. 大连理工大学建设工程学部土木工程学院，辽宁 大连 116024;
2. 海南大学土木建筑工程学院，海南 海口 570228
关键词：裂缝监测;分布式光纤;界面滑移;粘聚力单元
摘要：
针对分布式光纤监测开裂基体裂缝宽度传递率问题，该文提出一种考虑光纤-涂覆层界面滑移的分布式光纤监测裂缝应变传递模型。以理论分析为基础，建立分布式光纤监测裂缝扩展的有限单元模型(FEM)，将Cohesive单元嵌入至光纤与光纤涂覆层之间以模拟界面滑移行为，结合OFDR分布式光纤监测裂缝实验验证了该模型的可行性，进一步分析得到光纤应变峰值与裂缝宽度之间的函数关系。FEM和试验结果均表明，将光纤应变积分大小作为基体裂缝宽度的预测值，其误差范围小于5%。该研究为分布式光纤监测基体开裂的应用提供了理论依据，最后给出的裂缝传递率提高了分布式光纤监测裂缝宽度的准确性。
Experimental and numerical analysis of cracking monitoring based on distributed optical fiber
ZHAO Lizhi1, TANG Fujian1, ZHOU Zhi2
1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China;
2. School of Civil and Architectural Engineering, Hainan University, Haikou 570228, China
Abstract: In order to solve the problem of crack width transmissibility of cracked matrix monitored by distributed optical fiber, a strain transfer model of distributed optical fiber monitoring crack is proposed considering the interface slip between fiber and coating layer. Based on theoretical analysis, a finite element model (FEM) for distributed optical fiber crack propagation monitoring was established, and Cohesive elements were embedded into the interface between the optical fiber and optical fiber coating to simulate interface slip behavior. The feasibility of the model was verified by a test monitoring crack width based on OFDR distributed optical fiber. The functional relationship between the fiber strain peak value and crack width is obtained by further analysis. FEM and experimental results show that the error of considering the fiber strain integral as matrix crack width is less than 5%. The study provides a theoretical basis for the application of distributed optical fiber to monitor matrix cracking, and the transmittance of cracks improves the accuracy of crack width monitoring.
Keywords: crack monitoring;distributed optical fiber;interface slip;Cohesive element
2022, 48(12):7-14 收稿日期: 2022-03-09;收到修改稿日期: 2022-05-17
基金项目: 国家自然科学基金资助项目(51878119，52111540162)；辽宁省自然科学基金资助项目（2020-MS-121）
作者简介: 赵丽芝(1994-),女,山西临汾市人,博士研究生,专业方向为智能传感器与结构健康监测
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