Full-scale monitoring system for structural prestress loss based on distributed brillouin sensing technique

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Chunguang, Lan^1,2 ; Liguang, Zhou^2 ; Zhiyu, Huo^2

School of Civil Engineering, Beijing Jiaotong University, Beijing

100081, China^1

Beijing Construction Engineering Research Institute Co., LTD, Beijing

100039, China^2

关键词: Brillouin sensing;    Construction environment;    Construction stages;    Conventional sensors;    Monitoring results;    Prestressed structures;    Scale distributions;    Sensing techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012145/pdf
DOI  :  10.1088/1755-1315/81/1/012145

来源: IOP

【 摘 要 】

Prestress loss is critical to impact the safety of prestressed structures. Unfortunately, up to date, there are no qualified techniques to handle this issue due to the fact that it is too hard for sensors to survive the harsh construction environments and the time-dependent service life of the large-span prestressed structures. This paper proposes a novel technique to monitor prestress loss in prestressed beams using Brillouin optical fiber sensors. A novel smart steel strand based on the sensing technique of full-scale Brillouin optical fiber sensors was introduced. Two kinds of prestressed structure were used to verify the concept of monitoring prestress loss using smart steel strands. The prestress loss data have been taken by Brillouin optical fiber sensors. And the monitoring results agree well with those from the conventional sensors. The monitoring data can reveal both the full-scale distribution and the time history of prestress loss during the construction stage and also in-service phrase.